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old-cross-binutils/gdb/ia64-tdep.c
Jeff Johnston 102d615a7c 2003-08-26 Jeff Johnston <jjohnstn@redhat.com> 
* ia64-tdep.c (examine_prologue): Only stop at predicated insns if
        we are frameless or the return address register is already known.
2003-08-26 22:24:40 +00:00

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/* Target-dependent code for the IA-64 for GDB, the GNU debugger.
Copyright 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "inferior.h"
#include "symfile.h" /* for entry_point_address */
#include "gdbcore.h"
#include "arch-utils.h"
#include "floatformat.h"
#include "regcache.h"
#include "reggroups.h"
#include "frame.h"
#include "frame-base.h"
#include "frame-unwind.h"
#include "doublest.h"
#include "value.h"
#include "gdb_assert.h"
#include "objfiles.h"
#include "elf/common.h" /* for DT_PLTGOT value */
#include "elf-bfd.h"
/* Hook for determining the global pointer when calling functions in
the inferior under AIX. The initialization code in ia64-aix-nat.c
sets this hook to the address of a function which will find the
global pointer for a given address.
The generic code which uses the dynamic section in the inferior for
finding the global pointer is not of much use on AIX since the
values obtained from the inferior have not been relocated. */
CORE_ADDR (*native_find_global_pointer) (CORE_ADDR) = 0;
/* An enumeration of the different IA-64 instruction types. */
typedef enum instruction_type
{
A, /* Integer ALU ; I-unit or M-unit */
I, /* Non-ALU integer; I-unit */
M, /* Memory ; M-unit */
F, /* Floating-point ; F-unit */
B, /* Branch ; B-unit */
L, /* Extended (L+X) ; I-unit */
X, /* Extended (L+X) ; I-unit */
undefined /* undefined or reserved */
} instruction_type;
/* We represent IA-64 PC addresses as the value of the instruction
pointer or'd with some bit combination in the low nibble which
represents the slot number in the bundle addressed by the
instruction pointer. The problem is that the Linux kernel
multiplies its slot numbers (for exceptions) by one while the
disassembler multiplies its slot numbers by 6. In addition, I've
heard it said that the simulator uses 1 as the multiplier.
I've fixed the disassembler so that the bytes_per_line field will
be the slot multiplier. If bytes_per_line comes in as zero, it
is set to six (which is how it was set up initially). -- objdump
displays pretty disassembly dumps with this value. For our purposes,
we'll set bytes_per_line to SLOT_MULTIPLIER. This is okay since we
never want to also display the raw bytes the way objdump does. */
#define SLOT_MULTIPLIER 1
/* Length in bytes of an instruction bundle */
#define BUNDLE_LEN 16
/* FIXME: These extern declarations should go in ia64-tdep.h. */
extern CORE_ADDR ia64_linux_sigcontext_register_address (CORE_ADDR, int);
extern CORE_ADDR ia64_aix_sigcontext_register_address (CORE_ADDR, int);
static gdbarch_init_ftype ia64_gdbarch_init;
static gdbarch_register_name_ftype ia64_register_name;
static gdbarch_register_type_ftype ia64_register_type;
static gdbarch_breakpoint_from_pc_ftype ia64_breakpoint_from_pc;
static gdbarch_skip_prologue_ftype ia64_skip_prologue;
static gdbarch_extract_return_value_ftype ia64_extract_return_value;
static gdbarch_extract_struct_value_address_ftype ia64_extract_struct_value_address;
static gdbarch_use_struct_convention_ftype ia64_use_struct_convention;
static struct type *is_float_or_hfa_type (struct type *t);
static struct type *builtin_type_ia64_ext;
#define NUM_IA64_RAW_REGS 462
static int sp_regnum = IA64_GR12_REGNUM;
static int fp_regnum = IA64_VFP_REGNUM;
static int lr_regnum = IA64_VRAP_REGNUM;
/* NOTE: we treat the register stack registers r32-r127 as pseudo-registers because
they are in memory and must be calculated via the bsp register. */
enum pseudo_regs { FIRST_PSEUDO_REGNUM = NUM_IA64_RAW_REGS, VBOF_REGNUM = IA64_NAT127_REGNUM + 1, V32_REGNUM,
V127_REGNUM = V32_REGNUM + 95,
VP0_REGNUM, VP16_REGNUM = VP0_REGNUM + 16, VP63_REGNUM = VP0_REGNUM + 63, LAST_PSEUDO_REGNUM };
/* Array of register names; There should be ia64_num_regs strings in
the initializer. */
static char *ia64_register_names[] =
{ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
"f32", "f33", "f34", "f35", "f36", "f37", "f38", "f39",
"f40", "f41", "f42", "f43", "f44", "f45", "f46", "f47",
"f48", "f49", "f50", "f51", "f52", "f53", "f54", "f55",
"f56", "f57", "f58", "f59", "f60", "f61", "f62", "f63",
"f64", "f65", "f66", "f67", "f68", "f69", "f70", "f71",
"f72", "f73", "f74", "f75", "f76", "f77", "f78", "f79",
"f80", "f81", "f82", "f83", "f84", "f85", "f86", "f87",
"f88", "f89", "f90", "f91", "f92", "f93", "f94", "f95",
"f96", "f97", "f98", "f99", "f100", "f101", "f102", "f103",
"f104", "f105", "f106", "f107", "f108", "f109", "f110", "f111",
"f112", "f113", "f114", "f115", "f116", "f117", "f118", "f119",
"f120", "f121", "f122", "f123", "f124", "f125", "f126", "f127",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "",
"b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7",
"vfp", "vrap",
"pr", "ip", "psr", "cfm",
"kr0", "kr1", "kr2", "kr3", "kr4", "kr5", "kr6", "kr7",
"", "", "", "", "", "", "", "",
"rsc", "bsp", "bspstore", "rnat",
"", "fcr", "", "",
"eflag", "csd", "ssd", "cflg", "fsr", "fir", "fdr", "",
"ccv", "", "", "", "unat", "", "", "",
"fpsr", "", "", "", "itc",
"", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "",
"pfs", "lc", "ec",
"", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "",
"",
"nat0", "nat1", "nat2", "nat3", "nat4", "nat5", "nat6", "nat7",
"nat8", "nat9", "nat10", "nat11", "nat12", "nat13", "nat14", "nat15",
"nat16", "nat17", "nat18", "nat19", "nat20", "nat21", "nat22", "nat23",
"nat24", "nat25", "nat26", "nat27", "nat28", "nat29", "nat30", "nat31",
"nat32", "nat33", "nat34", "nat35", "nat36", "nat37", "nat38", "nat39",
"nat40", "nat41", "nat42", "nat43", "nat44", "nat45", "nat46", "nat47",
"nat48", "nat49", "nat50", "nat51", "nat52", "nat53", "nat54", "nat55",
"nat56", "nat57", "nat58", "nat59", "nat60", "nat61", "nat62", "nat63",
"nat64", "nat65", "nat66", "nat67", "nat68", "nat69", "nat70", "nat71",
"nat72", "nat73", "nat74", "nat75", "nat76", "nat77", "nat78", "nat79",
"nat80", "nat81", "nat82", "nat83", "nat84", "nat85", "nat86", "nat87",
"nat88", "nat89", "nat90", "nat91", "nat92", "nat93", "nat94", "nat95",
"nat96", "nat97", "nat98", "nat99", "nat100","nat101","nat102","nat103",
"nat104","nat105","nat106","nat107","nat108","nat109","nat110","nat111",
"nat112","nat113","nat114","nat115","nat116","nat117","nat118","nat119",
"nat120","nat121","nat122","nat123","nat124","nat125","nat126","nat127",
"bof",
"r32", "r33", "r34", "r35", "r36", "r37", "r38", "r39",
"r40", "r41", "r42", "r43", "r44", "r45", "r46", "r47",
"r48", "r49", "r50", "r51", "r52", "r53", "r54", "r55",
"r56", "r57", "r58", "r59", "r60", "r61", "r62", "r63",
"r64", "r65", "r66", "r67", "r68", "r69", "r70", "r71",
"r72", "r73", "r74", "r75", "r76", "r77", "r78", "r79",
"r80", "r81", "r82", "r83", "r84", "r85", "r86", "r87",
"r88", "r89", "r90", "r91", "r92", "r93", "r94", "r95",
"r96", "r97", "r98", "r99", "r100", "r101", "r102", "r103",
"r104", "r105", "r106", "r107", "r108", "r109", "r110", "r111",
"r112", "r113", "r114", "r115", "r116", "r117", "r118", "r119",
"r120", "r121", "r122", "r123", "r124", "r125", "r126", "r127",
"p0", "p1", "p2", "p3", "p4", "p5", "p6", "p7",
"p8", "p9", "p10", "p11", "p12", "p13", "p14", "p15",
"p16", "p17", "p18", "p19", "p20", "p21", "p22", "p23",
"p24", "p25", "p26", "p27", "p28", "p29", "p30", "p31",
"p32", "p33", "p34", "p35", "p36", "p37", "p38", "p39",
"p40", "p41", "p42", "p43", "p44", "p45", "p46", "p47",
"p48", "p49", "p50", "p51", "p52", "p53", "p54", "p55",
"p56", "p57", "p58", "p59", "p60", "p61", "p62", "p63",
};
struct ia64_frame_cache
{
CORE_ADDR base; /* frame pointer base for frame */
CORE_ADDR pc; /* function start pc for frame */
CORE_ADDR saved_sp; /* stack pointer for frame */
CORE_ADDR bsp; /* points at r32 for the current frame */
CORE_ADDR cfm; /* cfm value for current frame */
int frameless;
int sof; /* Size of frame (decoded from cfm value) */
int sol; /* Size of locals (decoded from cfm value) */
int sor; /* Number of rotating registers. (decoded from cfm value) */
CORE_ADDR after_prologue;
/* Address of first instruction after the last
prologue instruction; Note that there may
be instructions from the function's body
intermingled with the prologue. */
int mem_stack_frame_size;
/* Size of the memory stack frame (may be zero),
or -1 if it has not been determined yet. */
int fp_reg; /* Register number (if any) used a frame pointer
for this frame. 0 if no register is being used
as the frame pointer. */
/* Saved registers. */
CORE_ADDR saved_regs[NUM_IA64_RAW_REGS];
};
struct gdbarch_tdep
{
int os_ident; /* From the ELF header, one of the ELFOSABI_
constants: ELFOSABI_LINUX, ELFOSABI_AIX,
etc. */
CORE_ADDR (*sigcontext_register_address) (CORE_ADDR, int);
/* OS specific function which, given a frame address
and register number, returns the offset to the
given register from the start of the frame. */
CORE_ADDR (*find_global_pointer) (CORE_ADDR);
};
#define SIGCONTEXT_REGISTER_ADDRESS \
(gdbarch_tdep (current_gdbarch)->sigcontext_register_address)
#define FIND_GLOBAL_POINTER \
(gdbarch_tdep (current_gdbarch)->find_global_pointer)
int
ia64_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
struct reggroup *group)
{
int vector_p;
int float_p;
int raw_p;
if (group == all_reggroup)
return 1;
vector_p = TYPE_VECTOR (register_type (gdbarch, regnum));
float_p = TYPE_CODE (register_type (gdbarch, regnum)) == TYPE_CODE_FLT;
raw_p = regnum < NUM_IA64_RAW_REGS;
if (group == float_reggroup)
return float_p;
if (group == vector_reggroup)
return vector_p;
if (group == general_reggroup)
return (!vector_p && !float_p);
if (group == save_reggroup || group == restore_reggroup)
return raw_p;
return 0;
}
static const char *
ia64_register_name (int reg)
{
return ia64_register_names[reg];
}
struct type *
ia64_register_type (struct gdbarch *arch, int reg)
{
if (reg >= IA64_FR0_REGNUM && reg <= IA64_FR127_REGNUM)
return builtin_type_ia64_ext;
else
return builtin_type_long;
}
static int
ia64_dwarf_reg_to_regnum (int reg)
{
if (reg >= IA64_GR32_REGNUM && reg <= IA64_GR127_REGNUM)
return V32_REGNUM + (reg - IA64_GR32_REGNUM);
return reg;
}
const struct floatformat floatformat_ia64_ext =
{
floatformat_little, 82, 0, 1, 17, 65535, 0x1ffff, 18, 64,
floatformat_intbit_yes
};
/* Read the given register from a sigcontext structure in the
specified frame. */
static CORE_ADDR
read_sigcontext_register (struct frame_info *frame, int regnum)
{
CORE_ADDR regaddr;
if (frame == NULL)
internal_error (__FILE__, __LINE__,
"read_sigcontext_register: NULL frame");
if (!(get_frame_type (frame) == SIGTRAMP_FRAME))
internal_error (__FILE__, __LINE__,
"read_sigcontext_register: frame not a signal trampoline");
if (SIGCONTEXT_REGISTER_ADDRESS == 0)
internal_error (__FILE__, __LINE__,
"read_sigcontext_register: SIGCONTEXT_REGISTER_ADDRESS is 0");
regaddr = SIGCONTEXT_REGISTER_ADDRESS (get_frame_base (frame), regnum);
if (regaddr)
return read_memory_integer (regaddr, REGISTER_RAW_SIZE (regnum));
else
internal_error (__FILE__, __LINE__,
"read_sigcontext_register: Register %d not in struct sigcontext", regnum);
}
/* Extract ``len'' bits from an instruction bundle starting at
bit ``from''. */
static long long
extract_bit_field (char *bundle, int from, int len)
{
long long result = 0LL;
int to = from + len;
int from_byte = from / 8;
int to_byte = to / 8;
unsigned char *b = (unsigned char *) bundle;
unsigned char c;
int lshift;
int i;
c = b[from_byte];
if (from_byte == to_byte)
c = ((unsigned char) (c << (8 - to % 8))) >> (8 - to % 8);
result = c >> (from % 8);
lshift = 8 - (from % 8);
for (i = from_byte+1; i < to_byte; i++)
{
result |= ((long long) b[i]) << lshift;
lshift += 8;
}
if (from_byte < to_byte && (to % 8 != 0))
{
c = b[to_byte];
c = ((unsigned char) (c << (8 - to % 8))) >> (8 - to % 8);
result |= ((long long) c) << lshift;
}
return result;
}
/* Replace the specified bits in an instruction bundle */
static void
replace_bit_field (char *bundle, long long val, int from, int len)
{
int to = from + len;
int from_byte = from / 8;
int to_byte = to / 8;
unsigned char *b = (unsigned char *) bundle;
unsigned char c;
if (from_byte == to_byte)
{
unsigned char left, right;
c = b[from_byte];
left = (c >> (to % 8)) << (to % 8);
right = ((unsigned char) (c << (8 - from % 8))) >> (8 - from % 8);
c = (unsigned char) (val & 0xff);
c = (unsigned char) (c << (from % 8 + 8 - to % 8)) >> (8 - to % 8);
c |= right | left;
b[from_byte] = c;
}
else
{
int i;
c = b[from_byte];
c = ((unsigned char) (c << (8 - from % 8))) >> (8 - from % 8);
c = c | (val << (from % 8));
b[from_byte] = c;
val >>= 8 - from % 8;
for (i = from_byte+1; i < to_byte; i++)
{
c = val & 0xff;
val >>= 8;
b[i] = c;
}
if (to % 8 != 0)
{
unsigned char cv = (unsigned char) val;
c = b[to_byte];
c = c >> (to % 8) << (to % 8);
c |= ((unsigned char) (cv << (8 - to % 8))) >> (8 - to % 8);
b[to_byte] = c;
}
}
}
/* Return the contents of slot N (for N = 0, 1, or 2) in
and instruction bundle */
static long long
slotN_contents (char *bundle, int slotnum)
{
return extract_bit_field (bundle, 5+41*slotnum, 41);
}
/* Store an instruction in an instruction bundle */
static void
replace_slotN_contents (char *bundle, long long instr, int slotnum)
{
replace_bit_field (bundle, instr, 5+41*slotnum, 41);
}
static enum instruction_type template_encoding_table[32][3] =
{
{ M, I, I }, /* 00 */
{ M, I, I }, /* 01 */
{ M, I, I }, /* 02 */
{ M, I, I }, /* 03 */
{ M, L, X }, /* 04 */
{ M, L, X }, /* 05 */
{ undefined, undefined, undefined }, /* 06 */
{ undefined, undefined, undefined }, /* 07 */
{ M, M, I }, /* 08 */
{ M, M, I }, /* 09 */
{ M, M, I }, /* 0A */
{ M, M, I }, /* 0B */
{ M, F, I }, /* 0C */
{ M, F, I }, /* 0D */
{ M, M, F }, /* 0E */
{ M, M, F }, /* 0F */
{ M, I, B }, /* 10 */
{ M, I, B }, /* 11 */
{ M, B, B }, /* 12 */
{ M, B, B }, /* 13 */
{ undefined, undefined, undefined }, /* 14 */
{ undefined, undefined, undefined }, /* 15 */
{ B, B, B }, /* 16 */
{ B, B, B }, /* 17 */
{ M, M, B }, /* 18 */
{ M, M, B }, /* 19 */
{ undefined, undefined, undefined }, /* 1A */
{ undefined, undefined, undefined }, /* 1B */
{ M, F, B }, /* 1C */
{ M, F, B }, /* 1D */
{ undefined, undefined, undefined }, /* 1E */
{ undefined, undefined, undefined }, /* 1F */
};
/* Fetch and (partially) decode an instruction at ADDR and return the
address of the next instruction to fetch. */
static CORE_ADDR
fetch_instruction (CORE_ADDR addr, instruction_type *it, long long *instr)
{
char bundle[BUNDLE_LEN];
int slotnum = (int) (addr & 0x0f) / SLOT_MULTIPLIER;
long long template;
int val;
/* Warn about slot numbers greater than 2. We used to generate
an error here on the assumption that the user entered an invalid
address. But, sometimes GDB itself requests an invalid address.
This can (easily) happen when execution stops in a function for
which there are no symbols. The prologue scanner will attempt to
find the beginning of the function - if the nearest symbol
happens to not be aligned on a bundle boundary (16 bytes), the
resulting starting address will cause GDB to think that the slot
number is too large.
So we warn about it and set the slot number to zero. It is
not necessarily a fatal condition, particularly if debugging
at the assembly language level. */
if (slotnum > 2)
{
warning ("Can't fetch instructions for slot numbers greater than 2.\n"
"Using slot 0 instead");
slotnum = 0;
}
addr &= ~0x0f;
val = target_read_memory (addr, bundle, BUNDLE_LEN);
if (val != 0)
return 0;
*instr = slotN_contents (bundle, slotnum);
template = extract_bit_field (bundle, 0, 5);
*it = template_encoding_table[(int)template][slotnum];
if (slotnum == 2 || (slotnum == 1 && *it == L))
addr += 16;
else
addr += (slotnum + 1) * SLOT_MULTIPLIER;
return addr;
}
/* There are 5 different break instructions (break.i, break.b,
break.m, break.f, and break.x), but they all have the same
encoding. (The five bit template in the low five bits of the
instruction bundle distinguishes one from another.)
The runtime architecture manual specifies that break instructions
used for debugging purposes must have the upper two bits of the 21
bit immediate set to a 0 and a 1 respectively. A breakpoint
instruction encodes the most significant bit of its 21 bit
immediate at bit 36 of the 41 bit instruction. The penultimate msb
is at bit 25 which leads to the pattern below.
Originally, I had this set up to do, e.g, a "break.i 0x80000" But
it turns out that 0x80000 was used as the syscall break in the early
simulators. So I changed the pattern slightly to do "break.i 0x080001"
instead. But that didn't work either (I later found out that this
pattern was used by the simulator that I was using.) So I ended up
using the pattern seen below. */
#if 0
#define IA64_BREAKPOINT 0x00002000040LL
#endif
#define IA64_BREAKPOINT 0x00003333300LL
static int
ia64_memory_insert_breakpoint (CORE_ADDR addr, char *contents_cache)
{
char bundle[BUNDLE_LEN];
int slotnum = (int) (addr & 0x0f) / SLOT_MULTIPLIER;
long long instr;
int val;
int template;
if (slotnum > 2)
error("Can't insert breakpoint for slot numbers greater than 2.");
addr &= ~0x0f;
val = target_read_memory (addr, bundle, BUNDLE_LEN);
/* Check for L type instruction in 2nd slot, if present then
bump up the slot number to the 3rd slot */
template = extract_bit_field (bundle, 0, 5);
if (slotnum == 1 && template_encoding_table[template][1] == L)
{
slotnum = 2;
}
instr = slotN_contents (bundle, slotnum);
memcpy(contents_cache, &instr, sizeof(instr));
replace_slotN_contents (bundle, IA64_BREAKPOINT, slotnum);
if (val == 0)
target_write_memory (addr, bundle, BUNDLE_LEN);
return val;
}
static int
ia64_memory_remove_breakpoint (CORE_ADDR addr, char *contents_cache)
{
char bundle[BUNDLE_LEN];
int slotnum = (addr & 0x0f) / SLOT_MULTIPLIER;
long long instr;
int val;
int template;
addr &= ~0x0f;
val = target_read_memory (addr, bundle, BUNDLE_LEN);
/* Check for L type instruction in 2nd slot, if present then
bump up the slot number to the 3rd slot */
template = extract_bit_field (bundle, 0, 5);
if (slotnum == 1 && template_encoding_table[template][1] == L)
{
slotnum = 2;
}
memcpy (&instr, contents_cache, sizeof instr);
replace_slotN_contents (bundle, instr, slotnum);
if (val == 0)
target_write_memory (addr, bundle, BUNDLE_LEN);
return val;
}
/* We don't really want to use this, but remote.c needs to call it in order
to figure out if Z-packets are supported or not. Oh, well. */
const unsigned char *
ia64_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
{
static unsigned char breakpoint[] =
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
*lenptr = sizeof (breakpoint);
#if 0
*pcptr &= ~0x0f;
#endif
return breakpoint;
}
static CORE_ADDR
ia64_read_fp (void)
{
/* We won't necessarily have a frame pointer and even if we do, it
winds up being extraordinarly messy when attempting to find the
frame chain. So for the purposes of creating frames (which is
all deprecated_read_fp() is used for), simply use the stack
pointer value instead. */
gdb_assert (SP_REGNUM >= 0);
return read_register (SP_REGNUM);
}
static CORE_ADDR
ia64_read_pc (ptid_t ptid)
{
CORE_ADDR psr_value = read_register_pid (IA64_PSR_REGNUM, ptid);
CORE_ADDR pc_value = read_register_pid (IA64_IP_REGNUM, ptid);
int slot_num = (psr_value >> 41) & 3;
return pc_value | (slot_num * SLOT_MULTIPLIER);
}
static void
ia64_write_pc (CORE_ADDR new_pc, ptid_t ptid)
{
int slot_num = (int) (new_pc & 0xf) / SLOT_MULTIPLIER;
CORE_ADDR psr_value = read_register_pid (IA64_PSR_REGNUM, ptid);
psr_value &= ~(3LL << 41);
psr_value |= (CORE_ADDR)(slot_num & 0x3) << 41;
new_pc &= ~0xfLL;
write_register_pid (IA64_PSR_REGNUM, psr_value, ptid);
write_register_pid (IA64_IP_REGNUM, new_pc, ptid);
}
#define IS_NaT_COLLECTION_ADDR(addr) ((((addr) >> 3) & 0x3f) == 0x3f)
/* Returns the address of the slot that's NSLOTS slots away from
the address ADDR. NSLOTS may be positive or negative. */
static CORE_ADDR
rse_address_add(CORE_ADDR addr, int nslots)
{
CORE_ADDR new_addr;
int mandatory_nat_slots = nslots / 63;
int direction = nslots < 0 ? -1 : 1;
new_addr = addr + 8 * (nslots + mandatory_nat_slots);
if ((new_addr >> 9) != ((addr + 8 * 64 * mandatory_nat_slots) >> 9))
new_addr += 8 * direction;
if (IS_NaT_COLLECTION_ADDR(new_addr))
new_addr += 8 * direction;
return new_addr;
}
static void
ia64_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
int regnum, void *buf)
{
if (regnum >= V32_REGNUM && regnum <= V127_REGNUM)
{
ULONGEST bsp;
ULONGEST cfm;
CORE_ADDR reg;
regcache_cooked_read_unsigned (regcache, IA64_BSP_REGNUM, &bsp);
regcache_cooked_read_unsigned (regcache, IA64_CFM_REGNUM, &cfm);
/* The bsp points at the end of the register frame so we
subtract the size of frame from it to get start of register frame. */
bsp = rse_address_add (bsp, -(cfm & 0x7f));
if ((cfm & 0x7f) > regnum - V32_REGNUM)
{
ULONGEST reg_addr = rse_address_add (bsp, (regnum - V32_REGNUM));
reg = read_memory_integer ((CORE_ADDR)reg_addr, 8);
store_unsigned_integer (buf, REGISTER_RAW_SIZE (regnum), reg);
}
else
store_unsigned_integer (buf, REGISTER_RAW_SIZE (regnum), 0);
}
else if (IA64_NAT0_REGNUM <= regnum && regnum <= IA64_NAT31_REGNUM)
{
ULONGEST unatN_val;
ULONGEST unat;
regcache_cooked_read_unsigned (regcache, IA64_UNAT_REGNUM, &unat);
unatN_val = (unat & (1LL << (regnum - IA64_NAT0_REGNUM))) != 0;
store_unsigned_integer (buf, REGISTER_RAW_SIZE (regnum), unatN_val);
}
else if (IA64_NAT32_REGNUM <= regnum && regnum <= IA64_NAT127_REGNUM)
{
ULONGEST natN_val = 0;
ULONGEST bsp;
ULONGEST cfm;
CORE_ADDR gr_addr = 0;
regcache_cooked_read_unsigned (regcache, IA64_BSP_REGNUM, &bsp);
regcache_cooked_read_unsigned (regcache, IA64_CFM_REGNUM, &cfm);
/* The bsp points at the end of the register frame so we
subtract the size of frame from it to get start of register frame. */
bsp = rse_address_add (bsp, -(cfm & 0x7f));
if ((cfm & 0x7f) > regnum - V32_REGNUM)
gr_addr = rse_address_add (bsp, (regnum - V32_REGNUM));
if (gr_addr != 0)
{
/* Compute address of nat collection bits. */
CORE_ADDR nat_addr = gr_addr | 0x1f8;
CORE_ADDR nat_collection;
int nat_bit;
/* If our nat collection address is bigger than bsp, we have to get
the nat collection from rnat. Otherwise, we fetch the nat
collection from the computed address. */
if (nat_addr >= bsp)
regcache_cooked_read_unsigned (regcache, IA64_RNAT_REGNUM, &nat_collection);
else
nat_collection = read_memory_integer (nat_addr, 8);
nat_bit = (gr_addr >> 3) & 0x3f;
natN_val = (nat_collection >> nat_bit) & 1;
}
store_unsigned_integer (buf, REGISTER_RAW_SIZE (regnum), natN_val);
}
else if (regnum == VBOF_REGNUM)
{
/* A virtual register frame start is provided for user convenience.
It can be calculated as the bsp - sof (sizeof frame). */
ULONGEST bsp, vbsp;
ULONGEST cfm;
CORE_ADDR reg;
regcache_cooked_read_unsigned (regcache, IA64_BSP_REGNUM, &bsp);
regcache_cooked_read_unsigned (regcache, IA64_CFM_REGNUM, &cfm);
/* The bsp points at the end of the register frame so we
subtract the size of frame from it to get beginning of frame. */
vbsp = rse_address_add (bsp, -(cfm & 0x7f));
store_unsigned_integer (buf, REGISTER_RAW_SIZE (regnum), vbsp);
}
else if (VP0_REGNUM <= regnum && regnum <= VP63_REGNUM)
{
ULONGEST pr;
ULONGEST cfm;
ULONGEST prN_val;
CORE_ADDR reg;
regcache_cooked_read_unsigned (regcache, IA64_PR_REGNUM, &pr);
regcache_cooked_read_unsigned (regcache, IA64_CFM_REGNUM, &cfm);
if (VP16_REGNUM <= regnum && regnum <= VP63_REGNUM)
{
/* Fetch predicate register rename base from current frame
marker for this frame. */
int rrb_pr = (cfm >> 32) & 0x3f;
/* Adjust the register number to account for register rotation. */
regnum = VP16_REGNUM
+ ((regnum - VP16_REGNUM) + rrb_pr) % 48;
}
prN_val = (pr & (1LL << (regnum - VP0_REGNUM))) != 0;
store_unsigned_integer (buf, REGISTER_RAW_SIZE (regnum), prN_val);
}
else
memset (buf, 0, REGISTER_RAW_SIZE (regnum));
}
static void
ia64_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
int regnum, const void *buf)
{
if (regnum >= V32_REGNUM && regnum <= V127_REGNUM)
{
ULONGEST bsp;
ULONGEST cfm;
CORE_ADDR reg;
regcache_cooked_read_unsigned (regcache, IA64_BSP_REGNUM, &bsp);
regcache_cooked_read_unsigned (regcache, IA64_CFM_REGNUM, &cfm);
bsp = rse_address_add (bsp, -(cfm & 0x7f));
if ((cfm & 0x7f) > regnum - V32_REGNUM)
{
ULONGEST reg_addr = rse_address_add (bsp, (regnum - V32_REGNUM));
write_memory (reg_addr, (void *)buf, 8);
}
}
else if (IA64_NAT0_REGNUM <= regnum && regnum <= IA64_NAT31_REGNUM)
{
ULONGEST unatN_val, unat, unatN_mask;
regcache_cooked_read_unsigned (regcache, IA64_UNAT_REGNUM, &unat);
unatN_val = extract_unsigned_integer (buf, REGISTER_RAW_SIZE (regnum));
unatN_mask = (1LL << (regnum - IA64_NAT0_REGNUM));
if (unatN_val == 0)
unat &= ~unatN_mask;
else if (unatN_val == 1)
unat |= unatN_mask;
regcache_cooked_write_unsigned (regcache, IA64_UNAT_REGNUM, unat);
}
else if (IA64_NAT32_REGNUM <= regnum && regnum <= IA64_NAT127_REGNUM)
{
ULONGEST natN_val;
ULONGEST bsp;
ULONGEST cfm;
CORE_ADDR gr_addr = 0;
regcache_cooked_read_unsigned (regcache, IA64_BSP_REGNUM, &bsp);
regcache_cooked_read_unsigned (regcache, IA64_CFM_REGNUM, &cfm);
/* The bsp points at the end of the register frame so we
subtract the size of frame from it to get start of register frame. */
bsp = rse_address_add (bsp, -(cfm & 0x7f));
if ((cfm & 0x7f) > regnum - V32_REGNUM)
gr_addr = rse_address_add (bsp, (regnum - V32_REGNUM));
natN_val = extract_unsigned_integer (buf, REGISTER_RAW_SIZE (regnum));
if (gr_addr != 0 && (natN_val == 0 || natN_val == 1))
{
/* Compute address of nat collection bits. */
CORE_ADDR nat_addr = gr_addr | 0x1f8;
CORE_ADDR nat_collection;
int natN_bit = (gr_addr >> 3) & 0x3f;
ULONGEST natN_mask = (1LL << natN_bit);
/* If our nat collection address is bigger than bsp, we have to get
the nat collection from rnat. Otherwise, we fetch the nat
collection from the computed address. */
if (nat_addr >= bsp)
{
regcache_cooked_read_unsigned (regcache, IA64_RNAT_REGNUM, &nat_collection);
if (natN_val)
nat_collection |= natN_mask;
else
nat_collection &= ~natN_mask;
regcache_cooked_write_unsigned (regcache, IA64_RNAT_REGNUM, nat_collection);
}
else
{
char nat_buf[8];
nat_collection = read_memory_integer (nat_addr, 8);
if (natN_val)
nat_collection |= natN_mask;
else
nat_collection &= ~natN_mask;
store_unsigned_integer (nat_buf, REGISTER_RAW_SIZE (regnum), nat_collection);
write_memory (nat_addr, nat_buf, 8);
}
}
}
else if (VP0_REGNUM <= regnum && regnum <= VP63_REGNUM)
{
ULONGEST pr;
ULONGEST cfm;
ULONGEST prN_val;
ULONGEST prN_mask;
regcache_cooked_read_unsigned (regcache, IA64_PR_REGNUM, &pr);
regcache_cooked_read_unsigned (regcache, IA64_CFM_REGNUM, &cfm);
if (VP16_REGNUM <= regnum && regnum <= VP63_REGNUM)
{
/* Fetch predicate register rename base from current frame
marker for this frame. */
int rrb_pr = (cfm >> 32) & 0x3f;
/* Adjust the register number to account for register rotation. */
regnum = VP16_REGNUM
+ ((regnum - VP16_REGNUM) + rrb_pr) % 48;
}
prN_val = extract_unsigned_integer (buf, REGISTER_RAW_SIZE (regnum));
prN_mask = (1LL << (regnum - VP0_REGNUM));
if (prN_val == 0)
pr &= ~prN_mask;
else if (prN_val == 1)
pr |= prN_mask;
regcache_cooked_write_unsigned (regcache, IA64_PR_REGNUM, pr);
}
}
/* The ia64 needs to convert between various ieee floating-point formats
and the special ia64 floating point register format. */
static int
ia64_convert_register_p (int regno, struct type *type)
{
return (regno >= IA64_FR0_REGNUM && regno <= IA64_FR127_REGNUM);
}
static void
ia64_register_to_value (struct frame_info *frame, int regnum,
struct type *valtype, void *out)
{
char in[MAX_REGISTER_SIZE];
frame_register_read (frame, regnum, in);
convert_typed_floating (in, builtin_type_ia64_ext, out, valtype);
}
static void
ia64_value_to_register (struct frame_info *frame, int regnum,
struct type *valtype, const void *in)
{
char out[MAX_REGISTER_SIZE];
convert_typed_floating (in, valtype, out, builtin_type_ia64_ext);
put_frame_register (frame, regnum, out);
}
/* Limit the number of skipped non-prologue instructions since examining
of the prologue is expensive. */
static int max_skip_non_prologue_insns = 40;
/* Given PC representing the starting address of a function, and
LIM_PC which is the (sloppy) limit to which to scan when looking
for a prologue, attempt to further refine this limit by using
the line data in the symbol table. If successful, a better guess
on where the prologue ends is returned, otherwise the previous
value of lim_pc is returned. TRUST_LIMIT is a pointer to a flag
which will be set to indicate whether the returned limit may be
used with no further scanning in the event that the function is
frameless. */
static CORE_ADDR
refine_prologue_limit (CORE_ADDR pc, CORE_ADDR lim_pc, int *trust_limit)
{
struct symtab_and_line prologue_sal;
CORE_ADDR start_pc = pc;
/* Start off not trusting the limit. */
*trust_limit = 0;
prologue_sal = find_pc_line (pc, 0);
if (prologue_sal.line != 0)
{
int i;
CORE_ADDR addr = prologue_sal.end;
/* Handle the case in which compiler's optimizer/scheduler
has moved instructions into the prologue. We scan ahead
in the function looking for address ranges whose corresponding
line number is less than or equal to the first one that we
found for the function. (It can be less than when the
scheduler puts a body instruction before the first prologue
instruction.) */
for (i = 2 * max_skip_non_prologue_insns;
i > 0 && (lim_pc == 0 || addr < lim_pc);
i--)
{
struct symtab_and_line sal;
sal = find_pc_line (addr, 0);
if (sal.line == 0)
break;
if (sal.line <= prologue_sal.line
&& sal.symtab == prologue_sal.symtab)
{
prologue_sal = sal;
}
addr = sal.end;
}
if (lim_pc == 0 || prologue_sal.end < lim_pc)
{
lim_pc = prologue_sal.end;
if (start_pc == get_pc_function_start (lim_pc))
*trust_limit = 1;
}
}
return lim_pc;
}
#define isScratch(_regnum_) ((_regnum_) == 2 || (_regnum_) == 3 \
|| (8 <= (_regnum_) && (_regnum_) <= 11) \
|| (14 <= (_regnum_) && (_regnum_) <= 31))
#define imm9(_instr_) \
( ((((_instr_) & 0x01000000000LL) ? -1 : 0) << 8) \
| (((_instr_) & 0x00008000000LL) >> 20) \
| (((_instr_) & 0x00000001fc0LL) >> 6))
/* Allocate and initialize a frame cache. */
static struct ia64_frame_cache *
ia64_alloc_frame_cache (void)
{
struct ia64_frame_cache *cache;
int i;
cache = FRAME_OBSTACK_ZALLOC (struct ia64_frame_cache);
/* Base address. */
cache->base = 0;
cache->pc = 0;
cache->cfm = 0;
cache->sof = 0;
cache->sol = 0;
cache->sor = 0;
cache->bsp = 0;
cache->fp_reg = 0;
cache->frameless = 1;
for (i = 0; i < NUM_IA64_RAW_REGS; i++)
cache->saved_regs[i] = 0;
return cache;
}
static CORE_ADDR
examine_prologue (CORE_ADDR pc, CORE_ADDR lim_pc, struct frame_info *next_frame, struct ia64_frame_cache *cache)
{
CORE_ADDR next_pc;
CORE_ADDR last_prologue_pc = pc;
instruction_type it;
long long instr;
int cfm_reg = 0;
int ret_reg = 0;
int fp_reg = 0;
int unat_save_reg = 0;
int pr_save_reg = 0;
int mem_stack_frame_size = 0;
int spill_reg = 0;
CORE_ADDR spill_addr = 0;
char instores[8];
char infpstores[8];
char reg_contents[256];
int trust_limit;
int frameless = 1;
int i;
CORE_ADDR addr;
char buf[8];
CORE_ADDR bof, sor, sol, sof, cfm, rrb_gr;
memset (instores, 0, sizeof instores);
memset (infpstores, 0, sizeof infpstores);
memset (reg_contents, 0, sizeof reg_contents);
if (cache->after_prologue != 0
&& cache->after_prologue <= lim_pc)
return cache->after_prologue;
lim_pc = refine_prologue_limit (pc, lim_pc, &trust_limit);
next_pc = fetch_instruction (pc, &it, &instr);
/* We want to check if we have a recognizable function start before we
look ahead for a prologue. */
if (pc < lim_pc && next_pc
&& it == M && ((instr & 0x1ee0000003fLL) == 0x02c00000000LL))
{
/* alloc - start of a regular function. */
int sor = (int) ((instr & 0x00078000000LL) >> 27);
int sol = (int) ((instr & 0x00007f00000LL) >> 20);
int sof = (int) ((instr & 0x000000fe000LL) >> 13);
int rN = (int) ((instr & 0x00000001fc0LL) >> 6);
/* Verify that the current cfm matches what we think is the
function start. If we have somehow jumped within a function,
we do not want to interpret the prologue and calculate the
addresses of various registers such as the return address.
We will instead treat the frame as frameless. */
if (!next_frame ||
(sof == (cache->cfm & 0x7f) &&
sol == ((cache->cfm >> 7) & 0x7f)))
frameless = 0;
cfm_reg = rN;
last_prologue_pc = next_pc;
pc = next_pc;
}
else
{
/* Look for a leaf routine. */
if (pc < lim_pc && next_pc
&& (it == I || it == M)
&& ((instr & 0x1ee00000000LL) == 0x10800000000LL))
{
/* adds rN = imm14, rM (or mov rN, rM when imm14 is 0) */
int imm = (int) ((((instr & 0x01000000000LL) ? -1 : 0) << 13)
| ((instr & 0x001f8000000LL) >> 20)
| ((instr & 0x000000fe000LL) >> 13));
int rM = (int) ((instr & 0x00007f00000LL) >> 20);
int rN = (int) ((instr & 0x00000001fc0LL) >> 6);
int qp = (int) (instr & 0x0000000003fLL);
if (qp == 0 && rN == 2 && imm == 0 && rM == 12 && fp_reg == 0)
{
/* mov r2, r12 - beginning of leaf routine */
fp_reg = rN;
last_prologue_pc = next_pc;
}
}
/* If we don't recognize a regular function or leaf routine, we are
done. */
if (!fp_reg)
{
pc = lim_pc;
if (trust_limit)
last_prologue_pc = lim_pc;
}
}
/* Loop, looking for prologue instructions, keeping track of
where preserved registers were spilled. */
while (pc < lim_pc)
{
next_pc = fetch_instruction (pc, &it, &instr);
if (next_pc == 0)
break;
if (it == B && ((instr & 0x1e1f800003f) != 0x04000000000))
{
/* Exit loop upon hitting a non-nop branch instruction. */
if (trust_limit)
lim_pc = pc;
break;
}
else if (((instr & 0x3fLL) != 0LL) &&
(frameless || ret_reg != 0))
{
/* Exit loop upon hitting a predicated instruction if
we already have the return register or if we are frameless. */
if (trust_limit)
lim_pc = pc;
break;
}
else if (it == I && ((instr & 0x1eff8000000LL) == 0x00188000000LL))
{
/* Move from BR */
int b2 = (int) ((instr & 0x0000000e000LL) >> 13);
int rN = (int) ((instr & 0x00000001fc0LL) >> 6);
int qp = (int) (instr & 0x0000000003f);
if (qp == 0 && b2 == 0 && rN >= 32 && ret_reg == 0)
{
ret_reg = rN;
last_prologue_pc = next_pc;
}
}
else if ((it == I || it == M)
&& ((instr & 0x1ee00000000LL) == 0x10800000000LL))
{
/* adds rN = imm14, rM (or mov rN, rM when imm14 is 0) */
int imm = (int) ((((instr & 0x01000000000LL) ? -1 : 0) << 13)
| ((instr & 0x001f8000000LL) >> 20)
| ((instr & 0x000000fe000LL) >> 13));
int rM = (int) ((instr & 0x00007f00000LL) >> 20);
int rN = (int) ((instr & 0x00000001fc0LL) >> 6);
int qp = (int) (instr & 0x0000000003fLL);
if (qp == 0 && rN >= 32 && imm == 0 && rM == 12 && fp_reg == 0)
{
/* mov rN, r12 */
fp_reg = rN;
last_prologue_pc = next_pc;
}
else if (qp == 0 && rN == 12 && rM == 12)
{
/* adds r12, -mem_stack_frame_size, r12 */
mem_stack_frame_size -= imm;
last_prologue_pc = next_pc;
}
else if (qp == 0 && rN == 2
&& ((rM == fp_reg && fp_reg != 0) || rM == 12))
{
char buf[MAX_REGISTER_SIZE];
CORE_ADDR saved_sp = 0;
/* adds r2, spilloffset, rFramePointer
or
adds r2, spilloffset, r12
Get ready for stf.spill or st8.spill instructions.
The address to start spilling at is loaded into r2.
FIXME: Why r2? That's what gcc currently uses; it
could well be different for other compilers. */
/* Hmm... whether or not this will work will depend on
where the pc is. If it's still early in the prologue
this'll be wrong. FIXME */
if (next_frame)
{
frame_unwind_register (next_frame, sp_regnum, buf);
saved_sp = extract_unsigned_integer (buf, 8);
}
spill_addr = saved_sp
+ (rM == 12 ? 0 : mem_stack_frame_size)
+ imm;
spill_reg = rN;
last_prologue_pc = next_pc;
}
else if (qp == 0 && rM >= 32 && rM < 40 && !instores[rM] &&
rN < 256 && imm == 0)
{
/* mov rN, rM where rM is an input register */
reg_contents[rN] = rM;
last_prologue_pc = next_pc;
}
else if (frameless && qp == 0 && rN == fp_reg && imm == 0 &&
rM == 2)
{
/* mov r12, r2 */
last_prologue_pc = next_pc;
break;
}
}
else if (it == M
&& ( ((instr & 0x1efc0000000LL) == 0x0eec0000000LL)
|| ((instr & 0x1ffc8000000LL) == 0x0cec0000000LL) ))
{
/* stf.spill [rN] = fM, imm9
or
stf.spill [rN] = fM */
int imm = imm9(instr);
int rN = (int) ((instr & 0x00007f00000LL) >> 20);
int fM = (int) ((instr & 0x000000fe000LL) >> 13);
int qp = (int) (instr & 0x0000000003fLL);
if (qp == 0 && rN == spill_reg && spill_addr != 0
&& ((2 <= fM && fM <= 5) || (16 <= fM && fM <= 31)))
{
cache->saved_regs[IA64_FR0_REGNUM + fM] = spill_addr;
if ((instr & 0x1efc0000000) == 0x0eec0000000)
spill_addr += imm;
else
spill_addr = 0; /* last one; must be done */
last_prologue_pc = next_pc;
}
}
else if ((it == M && ((instr & 0x1eff8000000LL) == 0x02110000000LL))
|| (it == I && ((instr & 0x1eff8000000LL) == 0x00050000000LL)) )
{
/* mov.m rN = arM
or
mov.i rN = arM */
int arM = (int) ((instr & 0x00007f00000LL) >> 20);
int rN = (int) ((instr & 0x00000001fc0LL) >> 6);
int qp = (int) (instr & 0x0000000003fLL);
if (qp == 0 && isScratch (rN) && arM == 36 /* ar.unat */)
{
/* We have something like "mov.m r3 = ar.unat". Remember the
r3 (or whatever) and watch for a store of this register... */
unat_save_reg = rN;
last_prologue_pc = next_pc;
}
}
else if (it == I && ((instr & 0x1eff8000000LL) == 0x00198000000LL))
{
/* mov rN = pr */
int rN = (int) ((instr & 0x00000001fc0LL) >> 6);
int qp = (int) (instr & 0x0000000003fLL);
if (qp == 0 && isScratch (rN))
{
pr_save_reg = rN;
last_prologue_pc = next_pc;
}
}
else if (it == M
&& ( ((instr & 0x1ffc8000000LL) == 0x08cc0000000LL)
|| ((instr & 0x1efc0000000LL) == 0x0acc0000000LL)))
{
/* st8 [rN] = rM
or
st8 [rN] = rM, imm9 */
int rN = (int) ((instr & 0x00007f00000LL) >> 20);
int rM = (int) ((instr & 0x000000fe000LL) >> 13);
int qp = (int) (instr & 0x0000000003fLL);
int indirect = rM < 256 ? reg_contents[rM] : 0;
if (qp == 0 && rN == spill_reg && spill_addr != 0
&& (rM == unat_save_reg || rM == pr_save_reg))
{
/* We've found a spill of either the UNAT register or the PR
register. (Well, not exactly; what we've actually found is
a spill of the register that UNAT or PR was moved to).
Record that fact and move on... */
if (rM == unat_save_reg)
{
/* Track UNAT register */
cache->saved_regs[IA64_UNAT_REGNUM] = spill_addr;
unat_save_reg = 0;
}
else
{
/* Track PR register */
cache->saved_regs[IA64_PR_REGNUM] = spill_addr;
pr_save_reg = 0;
}
if ((instr & 0x1efc0000000LL) == 0x0acc0000000LL)
/* st8 [rN] = rM, imm9 */
spill_addr += imm9(instr);
else
spill_addr = 0; /* must be done spilling */
last_prologue_pc = next_pc;
}
else if (qp == 0 && 32 <= rM && rM < 40 && !instores[rM-32])
{
/* Allow up to one store of each input register. */
instores[rM-32] = 1;
last_prologue_pc = next_pc;
}
else if (qp == 0 && 32 <= indirect && indirect < 40 &&
!instores[indirect-32])
{
/* Allow an indirect store of an input register. */
instores[indirect-32] = 1;
last_prologue_pc = next_pc;
}
}
else if (it == M && ((instr & 0x1ff08000000LL) == 0x08c00000000LL))
{
/* One of
st1 [rN] = rM
st2 [rN] = rM
st4 [rN] = rM
st8 [rN] = rM
Note that the st8 case is handled in the clause above.
Advance over stores of input registers. One store per input
register is permitted. */
int rM = (int) ((instr & 0x000000fe000LL) >> 13);
int qp = (int) (instr & 0x0000000003fLL);
int indirect = rM < 256 ? reg_contents[rM] : 0;
if (qp == 0 && 32 <= rM && rM < 40 && !instores[rM-32])
{
instores[rM-32] = 1;
last_prologue_pc = next_pc;
}
else if (qp == 0 && 32 <= indirect && indirect < 40 &&
!instores[indirect-32])
{
/* Allow an indirect store of an input register. */
instores[indirect-32] = 1;
last_prologue_pc = next_pc;
}
}
else if (it == M && ((instr & 0x1ff88000000LL) == 0x0cc80000000LL))
{
/* Either
stfs [rN] = fM
or
stfd [rN] = fM
Advance over stores of floating point input registers. Again
one store per register is permitted */
int fM = (int) ((instr & 0x000000fe000LL) >> 13);
int qp = (int) (instr & 0x0000000003fLL);
if (qp == 0 && 8 <= fM && fM < 16 && !infpstores[fM - 8])
{
infpstores[fM-8] = 1;
last_prologue_pc = next_pc;
}
}
else if (it == M
&& ( ((instr & 0x1ffc8000000LL) == 0x08ec0000000LL)
|| ((instr & 0x1efc0000000LL) == 0x0aec0000000LL)))
{
/* st8.spill [rN] = rM
or
st8.spill [rN] = rM, imm9 */
int rN = (int) ((instr & 0x00007f00000LL) >> 20);
int rM = (int) ((instr & 0x000000fe000LL) >> 13);
int qp = (int) (instr & 0x0000000003fLL);
if (qp == 0 && rN == spill_reg && 4 <= rM && rM <= 7)
{
/* We've found a spill of one of the preserved general purpose
regs. Record the spill address and advance the spill
register if appropriate. */
cache->saved_regs[IA64_GR0_REGNUM + rM] = spill_addr;
if ((instr & 0x1efc0000000LL) == 0x0aec0000000LL)
/* st8.spill [rN] = rM, imm9 */
spill_addr += imm9(instr);
else
spill_addr = 0; /* Done spilling */
last_prologue_pc = next_pc;
}
}
pc = next_pc;
}
/* If not frameless and we aren't called by skip_prologue, then we need to calculate
registers for the previous frame which will be needed later. */
if (!frameless && next_frame)
{
/* Extract the size of the rotating portion of the stack
frame and the register rename base from the current
frame marker. */
cfm = cache->cfm;
sor = cache->sor;
sof = cache->sof;
sol = cache->sol;
rrb_gr = (cfm >> 18) & 0x7f;
/* Find the bof (beginning of frame). */
bof = rse_address_add (cache->bsp, -sof);
for (i = 0, addr = bof;
i < sof;
i++, addr += 8)
{
if (IS_NaT_COLLECTION_ADDR (addr))
{
addr += 8;
}
if (i+32 == cfm_reg)
cache->saved_regs[IA64_CFM_REGNUM] = addr;
if (i+32 == ret_reg)
cache->saved_regs[IA64_VRAP_REGNUM] = addr;
if (i+32 == fp_reg)
cache->saved_regs[IA64_VFP_REGNUM] = addr;
}
/* For the previous argument registers we require the previous bof.
If we can't find the previous cfm, then we can do nothing. */
if (cache->saved_regs[IA64_CFM_REGNUM] != 0)
{
cfm = read_memory_integer (cache->saved_regs[IA64_CFM_REGNUM], 8);
sor = ((cfm >> 14) & 0xf) * 8;
sof = (cfm & 0x7f);
sol = (cfm >> 7) & 0x7f;
rrb_gr = (cfm >> 18) & 0x7f;
/* The previous bof only requires subtraction of the sol (size of locals)
due to the overlap between output and input of subsequent frames. */
bof = rse_address_add (bof, -sol);
for (i = 0, addr = bof;
i < sof;
i++, addr += 8)
{
if (IS_NaT_COLLECTION_ADDR (addr))
{
addr += 8;
}
if (i < sor)
cache->saved_regs[IA64_GR32_REGNUM + ((i + (sor - rrb_gr)) % sor)]
= addr;
else
cache->saved_regs[IA64_GR32_REGNUM + i] = addr;
}
}
}
/* Try and trust the lim_pc value whenever possible. */
if (trust_limit && lim_pc >= last_prologue_pc)
last_prologue_pc = lim_pc;
cache->frameless = frameless;
cache->after_prologue = last_prologue_pc;
cache->mem_stack_frame_size = mem_stack_frame_size;
cache->fp_reg = fp_reg;
return last_prologue_pc;
}
CORE_ADDR
ia64_skip_prologue (CORE_ADDR pc)
{
struct ia64_frame_cache cache;
cache.base = 0;
cache.after_prologue = 0;
cache.cfm = 0;
cache.bsp = 0;
/* Call examine_prologue with - as third argument since we don't have a next frame pointer to send. */
return examine_prologue (pc, pc+1024, 0, &cache);
}
/* Normal frames. */
static struct ia64_frame_cache *
ia64_frame_cache (struct frame_info *next_frame, void **this_cache)
{
struct ia64_frame_cache *cache;
char buf[8];
CORE_ADDR cfm, sof, sol, bsp, psr;
int i;
if (*this_cache)
return *this_cache;
cache = ia64_alloc_frame_cache ();
*this_cache = cache;
frame_unwind_register (next_frame, sp_regnum, buf);
cache->saved_sp = extract_unsigned_integer (buf, 8);
/* We always want the bsp to point to the end of frame.
This way, we can always get the beginning of frame (bof)
by subtracting frame size. */
frame_unwind_register (next_frame, IA64_BSP_REGNUM, buf);
cache->bsp = extract_unsigned_integer (buf, 8);
frame_unwind_register (next_frame, IA64_PSR_REGNUM, buf);
psr = extract_unsigned_integer (buf, 8);
frame_unwind_register (next_frame, IA64_CFM_REGNUM, buf);
cfm = extract_unsigned_integer (buf, 8);
cache->sof = (cfm & 0x7f);
cache->sol = (cfm >> 7) & 0x7f;
cache->sor = ((cfm >> 14) & 0xf) * 8;
cache->cfm = cfm;
cache->pc = frame_func_unwind (next_frame);
if (cache->pc != 0)
examine_prologue (cache->pc, frame_pc_unwind (next_frame), next_frame, cache);
cache->base = cache->saved_sp + cache->mem_stack_frame_size;
return cache;
}
static void
ia64_frame_this_id (struct frame_info *next_frame, void **this_cache,
struct frame_id *this_id)
{
struct ia64_frame_cache *cache =
ia64_frame_cache (next_frame, this_cache);
/* This marks the outermost frame. */
if (cache->base == 0)
return;
(*this_id) = frame_id_build (cache->base, cache->pc);
}
static void
ia64_frame_prev_register (struct frame_info *next_frame, void **this_cache,
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
int *realnump, void *valuep)
{
struct ia64_frame_cache *cache =
ia64_frame_cache (next_frame, this_cache);
char dummy_valp[MAX_REGISTER_SIZE];
char buf[8];
gdb_assert (regnum >= 0);
if (!target_has_registers)
error ("No registers.");
*optimizedp = 0;
*addrp = 0;
*lvalp = not_lval;
*realnump = -1;
/* Rather than check each time if valuep is non-null, supply a dummy buffer
when valuep is not supplied. */
if (!valuep)
valuep = dummy_valp;
memset (valuep, 0, REGISTER_RAW_SIZE (regnum));
if (regnum == SP_REGNUM)
{
/* Handle SP values for all frames but the topmost. */
store_unsigned_integer (valuep, REGISTER_RAW_SIZE (regnum),
cache->base);
}
else if (regnum == IA64_BSP_REGNUM)
{
char cfm_valuep[MAX_REGISTER_SIZE];
int cfm_optim;
int cfm_realnum;
enum lval_type cfm_lval;
CORE_ADDR cfm_addr;
CORE_ADDR bsp, prev_cfm, prev_bsp;
/* We want to calculate the previous bsp as the end of the previous register stack frame.
This corresponds to what the hardware bsp register will be if we pop the frame
back which is why we might have been called. We know the beginning of the current
frame is cache->bsp - cache->sof. This value in the previous frame points to
the start of the output registers. We can calculate the end of that frame by adding
the size of output (sof (size of frame) - sol (size of locals)). */
ia64_frame_prev_register (next_frame, this_cache, IA64_CFM_REGNUM,
&cfm_optim, &cfm_lval, &cfm_addr, &cfm_realnum, cfm_valuep);
prev_cfm = extract_unsigned_integer (cfm_valuep, 8);
bsp = rse_address_add (cache->bsp, -(cache->sof));
prev_bsp = rse_address_add (bsp, (prev_cfm & 0x7f) - ((prev_cfm >> 7) & 0x7f));
store_unsigned_integer (valuep, REGISTER_RAW_SIZE (regnum),
prev_bsp);
}
else if (regnum == IA64_CFM_REGNUM)
{
CORE_ADDR addr = 0;
if (cache->frameless)
{
CORE_ADDR cfm = 0;
frame_unwind_register (next_frame, IA64_PFS_REGNUM, valuep);
}
else
{
addr = cache->saved_regs[IA64_CFM_REGNUM];
if (addr != 0)
read_memory (addr, valuep, REGISTER_RAW_SIZE (regnum));
}
}
else if (regnum == IA64_VFP_REGNUM)
{
/* If the function in question uses an automatic register (r32-r127)
for the frame pointer, it'll be found by ia64_find_saved_register()
above. If the function lacks one of these frame pointers, we can
still provide a value since we know the size of the frame. */
CORE_ADDR vfp = cache->base;
store_unsigned_integer (valuep, REGISTER_RAW_SIZE (IA64_VFP_REGNUM), vfp);
}
else if (VP0_REGNUM <= regnum && regnum <= VP63_REGNUM)
{
char pr_valuep[MAX_REGISTER_SIZE];
int pr_optim;
int pr_realnum;
enum lval_type pr_lval;
CORE_ADDR pr_addr;
ULONGEST prN_val;
ia64_frame_prev_register (next_frame, this_cache, IA64_PR_REGNUM,
&pr_optim, &pr_lval, &pr_addr, &pr_realnum, pr_valuep);
if (VP16_REGNUM <= regnum && regnum <= VP63_REGNUM)
{
/* Fetch predicate register rename base from current frame
marker for this frame. */
int rrb_pr = (cache->cfm >> 32) & 0x3f;
/* Adjust the register number to account for register rotation. */
regnum = VP16_REGNUM
+ ((regnum - VP16_REGNUM) + rrb_pr) % 48;
}
prN_val = extract_bit_field ((unsigned char *) pr_valuep,
regnum - VP0_REGNUM, 1);
store_unsigned_integer (valuep, REGISTER_RAW_SIZE (regnum), prN_val);
}
else if (IA64_NAT0_REGNUM <= regnum && regnum <= IA64_NAT31_REGNUM)
{
char unat_valuep[MAX_REGISTER_SIZE];
int unat_optim;
int unat_realnum;
enum lval_type unat_lval;
CORE_ADDR unat_addr;
ULONGEST unatN_val;
ia64_frame_prev_register (next_frame, this_cache, IA64_UNAT_REGNUM,
&unat_optim, &unat_lval, &unat_addr, &unat_realnum, unat_valuep);
unatN_val = extract_bit_field ((unsigned char *) unat_valuep,
regnum - IA64_NAT0_REGNUM, 1);
store_unsigned_integer (valuep, REGISTER_RAW_SIZE (regnum),
unatN_val);
}
else if (IA64_NAT32_REGNUM <= regnum && regnum <= IA64_NAT127_REGNUM)
{
int natval = 0;
/* Find address of general register corresponding to nat bit we're
interested in. */
CORE_ADDR gr_addr;
gr_addr = cache->saved_regs[regnum - IA64_NAT0_REGNUM
+ IA64_GR0_REGNUM];
if (gr_addr != 0)
{
/* Compute address of nat collection bits. */
CORE_ADDR nat_addr = gr_addr | 0x1f8;
CORE_ADDR bsp;
CORE_ADDR nat_collection;
int nat_bit;
/* If our nat collection address is bigger than bsp, we have to get
the nat collection from rnat. Otherwise, we fetch the nat
collection from the computed address. */
frame_unwind_register (next_frame, IA64_BSP_REGNUM, buf);
bsp = extract_unsigned_integer (buf, 8);
if (nat_addr >= bsp)
{
frame_unwind_register (next_frame, IA64_RNAT_REGNUM, buf);
nat_collection = extract_unsigned_integer (buf, 8);
}
else
nat_collection = read_memory_integer (nat_addr, 8);
nat_bit = (gr_addr >> 3) & 0x3f;
natval = (nat_collection >> nat_bit) & 1;
}
store_unsigned_integer (valuep, REGISTER_RAW_SIZE (regnum), natval);
}
else if (regnum == IA64_IP_REGNUM)
{
CORE_ADDR pc = 0;
if (cache->frameless)
{
frame_unwind_register (next_frame, IA64_BR0_REGNUM, buf);
pc = extract_unsigned_integer (buf, 8);
}
else
{
CORE_ADDR addr = cache->saved_regs[IA64_VRAP_REGNUM];
if (addr != 0)
{
read_memory (addr, buf, REGISTER_RAW_SIZE (IA64_IP_REGNUM));
pc = extract_unsigned_integer (buf, 8);
}
}
pc &= ~0xf;
store_unsigned_integer (valuep, 8, pc);
}
else if (regnum == IA64_PSR_REGNUM)
{
ULONGEST slot_num = 0;
CORE_ADDR pc= 0;
CORE_ADDR psr = 0;
frame_unwind_register (next_frame, IA64_PSR_REGNUM, buf);
psr = extract_unsigned_integer (buf, 8);
if (cache->frameless)
{
CORE_ADDR pc;
frame_unwind_register (next_frame, IA64_BR0_REGNUM, buf);
pc = extract_unsigned_integer (buf, 8);
}
else
{
CORE_ADDR addr = cache->saved_regs[IA64_VRAP_REGNUM];
if (addr != 0)
{
read_memory (addr, buf, REGISTER_RAW_SIZE (IA64_IP_REGNUM));
pc = extract_unsigned_integer (buf, 8);
}
}
psr &= ~(3LL << 41);
slot_num = pc & 0x3LL;
psr |= (CORE_ADDR)slot_num << 41;
store_unsigned_integer (valuep, 8, psr);
}
else if ((regnum >= IA64_GR32_REGNUM && regnum <= IA64_GR127_REGNUM) ||
(regnum >= V32_REGNUM && regnum <= V127_REGNUM))
{
CORE_ADDR addr = 0;
if (regnum >= V32_REGNUM)
regnum = IA64_GR32_REGNUM + (regnum - V32_REGNUM);
addr = cache->saved_regs[regnum];
if (addr != 0)
{
*lvalp = lval_memory;
*addrp = addr;
read_memory (addr, valuep, REGISTER_RAW_SIZE (regnum));
}
else if (cache->frameless)
{
char r_valuep[MAX_REGISTER_SIZE];
int r_optim;
int r_realnum;
enum lval_type r_lval;
CORE_ADDR r_addr;
CORE_ADDR prev_cfm, prev_bsp, prev_bof;
CORE_ADDR addr = 0;
if (regnum >= V32_REGNUM)
regnum = IA64_GR32_REGNUM + (regnum - V32_REGNUM);
ia64_frame_prev_register (next_frame, this_cache, IA64_CFM_REGNUM,
&r_optim, &r_lval, &r_addr, &r_realnum, r_valuep);
prev_cfm = extract_unsigned_integer (r_valuep, 8);
ia64_frame_prev_register (next_frame, this_cache, IA64_BSP_REGNUM,
&r_optim, &r_lval, &r_addr, &r_realnum, r_valuep);
prev_bsp = extract_unsigned_integer (r_valuep, 8);
prev_bof = rse_address_add (prev_bsp, -(prev_cfm & 0x7f));
addr = rse_address_add (prev_bof, (regnum - IA64_GR32_REGNUM));
*lvalp = lval_memory;
*addrp = addr;
read_memory (addr, valuep, REGISTER_RAW_SIZE (regnum));
}
}
else
{
CORE_ADDR addr = 0;
if (IA64_FR32_REGNUM <= regnum && regnum <= IA64_FR127_REGNUM)
{
/* Fetch floating point register rename base from current
frame marker for this frame. */
int rrb_fr = (cache->cfm >> 25) & 0x7f;
/* Adjust the floating point register number to account for
register rotation. */
regnum = IA64_FR32_REGNUM
+ ((regnum - IA64_FR32_REGNUM) + rrb_fr) % 96;
}
/* If we have stored a memory address, access the register. */
addr = cache->saved_regs[regnum];
if (addr != 0)
{
*lvalp = lval_memory;
*addrp = addr;
read_memory (addr, valuep, REGISTER_RAW_SIZE (regnum));
}
/* Otherwise, punt and get the current value of the register. */
else
frame_unwind_register (next_frame, regnum, valuep);
}
}
static const struct frame_unwind ia64_frame_unwind =
{
NORMAL_FRAME,
&ia64_frame_this_id,
&ia64_frame_prev_register
};
static const struct frame_unwind *
ia64_frame_sniffer (struct frame_info *next_frame)
{
return &ia64_frame_unwind;
}
/* Signal trampolines. */
static void
ia64_sigtramp_frame_init_saved_regs (struct ia64_frame_cache *cache)
{
if (SIGCONTEXT_REGISTER_ADDRESS)
{
int regno;
cache->saved_regs[IA64_VRAP_REGNUM] =
SIGCONTEXT_REGISTER_ADDRESS (cache->base, IA64_IP_REGNUM);
cache->saved_regs[IA64_CFM_REGNUM] =
SIGCONTEXT_REGISTER_ADDRESS (cache->base, IA64_CFM_REGNUM);
cache->saved_regs[IA64_PSR_REGNUM] =
SIGCONTEXT_REGISTER_ADDRESS (cache->base, IA64_PSR_REGNUM);
#if 0
cache->saved_regs[IA64_BSP_REGNUM] =
SIGCONTEXT_REGISTER_ADDRESS (frame->frame, IA64_BSP_REGNUM);
#endif
cache->saved_regs[IA64_RNAT_REGNUM] =
SIGCONTEXT_REGISTER_ADDRESS (cache->base, IA64_RNAT_REGNUM);
cache->saved_regs[IA64_CCV_REGNUM] =
SIGCONTEXT_REGISTER_ADDRESS (cache->base, IA64_CCV_REGNUM);
cache->saved_regs[IA64_UNAT_REGNUM] =
SIGCONTEXT_REGISTER_ADDRESS (cache->base, IA64_UNAT_REGNUM);
cache->saved_regs[IA64_FPSR_REGNUM] =
SIGCONTEXT_REGISTER_ADDRESS (cache->base, IA64_FPSR_REGNUM);
cache->saved_regs[IA64_PFS_REGNUM] =
SIGCONTEXT_REGISTER_ADDRESS (cache->base, IA64_PFS_REGNUM);
cache->saved_regs[IA64_LC_REGNUM] =
SIGCONTEXT_REGISTER_ADDRESS (cache->base, IA64_LC_REGNUM);
for (regno = IA64_GR1_REGNUM; regno <= IA64_GR31_REGNUM; regno++)
if (regno != sp_regnum)
cache->saved_regs[regno] =
SIGCONTEXT_REGISTER_ADDRESS (cache->base, regno);
for (regno = IA64_BR0_REGNUM; regno <= IA64_BR7_REGNUM; regno++)
cache->saved_regs[regno] =
SIGCONTEXT_REGISTER_ADDRESS (cache->base, regno);
for (regno = IA64_FR2_REGNUM; regno <= IA64_BR7_REGNUM; regno++)
cache->saved_regs[regno] =
SIGCONTEXT_REGISTER_ADDRESS (cache->base, regno);
}
}
static struct ia64_frame_cache *
ia64_sigtramp_frame_cache (struct frame_info *next_frame, void **this_cache)
{
struct ia64_frame_cache *cache;
CORE_ADDR addr;
char buf[8];
int i;
if (*this_cache)
return *this_cache;
cache = ia64_alloc_frame_cache ();
frame_unwind_register (next_frame, sp_regnum, buf);
cache->base = extract_unsigned_integer (buf, 8) + cache->mem_stack_frame_size;
ia64_sigtramp_frame_init_saved_regs (cache);
*this_cache = cache;
return cache;
}
static void
ia64_sigtramp_frame_this_id (struct frame_info *next_frame,
void **this_cache, struct frame_id *this_id)
{
struct ia64_frame_cache *cache =
ia64_sigtramp_frame_cache (next_frame, this_cache);
(*this_id) = frame_id_build (cache->base, frame_pc_unwind (next_frame));
}
static void
ia64_sigtramp_frame_prev_register (struct frame_info *next_frame,
void **this_cache,
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
int *realnump, void *valuep)
{
/* Make sure we've initialized the cache. */
ia64_sigtramp_frame_cache (next_frame, this_cache);
ia64_frame_prev_register (next_frame, this_cache, regnum,
optimizedp, lvalp, addrp, realnump, valuep);
}
static const struct frame_unwind ia64_sigtramp_frame_unwind =
{
SIGTRAMP_FRAME,
ia64_sigtramp_frame_this_id,
ia64_sigtramp_frame_prev_register
};
static const struct frame_unwind *
ia64_sigtramp_frame_sniffer (struct frame_info *next_frame)
{
char *name;
CORE_ADDR pc = frame_pc_unwind (next_frame);
find_pc_partial_function (pc, &name, NULL, NULL);
if (PC_IN_SIGTRAMP (pc, name))
return &ia64_sigtramp_frame_unwind;
return NULL;
}
static CORE_ADDR
ia64_frame_base_address (struct frame_info *next_frame, void **this_cache)
{
struct ia64_frame_cache *cache =
ia64_frame_cache (next_frame, this_cache);
return cache->base;
}
static const struct frame_base ia64_frame_base =
{
&ia64_frame_unwind,
ia64_frame_base_address,
ia64_frame_base_address,
ia64_frame_base_address
};
/* Should we use EXTRACT_STRUCT_VALUE_ADDRESS instead of
EXTRACT_RETURN_VALUE? GCC_P is true if compiled with gcc
and TYPE is the type (which is known to be struct, union or array). */
int
ia64_use_struct_convention (int gcc_p, struct type *type)
{
struct type *float_elt_type;
/* HFAs are structures (or arrays) consisting entirely of floating
point values of the same length. Up to 8 of these are returned
in registers. Don't use the struct convention when this is the
case. */
float_elt_type = is_float_or_hfa_type (type);
if (float_elt_type != NULL
&& TYPE_LENGTH (type) / TYPE_LENGTH (float_elt_type) <= 8)
return 0;
/* Other structs of length 32 or less are returned in r8-r11.
Don't use the struct convention for those either. */
return TYPE_LENGTH (type) > 32;
}
void
ia64_extract_return_value (struct type *type, struct regcache *regcache, void *valbuf)
{
struct type *float_elt_type;
float_elt_type = is_float_or_hfa_type (type);
if (float_elt_type != NULL)
{
char from[MAX_REGISTER_SIZE];
int offset = 0;
int regnum = IA64_FR8_REGNUM;
int n = TYPE_LENGTH (type) / TYPE_LENGTH (float_elt_type);
while (n-- > 0)
{
regcache_cooked_read (regcache, regnum, from);
convert_typed_floating (from, builtin_type_ia64_ext,
(char *)valbuf + offset, float_elt_type);
offset += TYPE_LENGTH (float_elt_type);
regnum++;
}
}
else
{
ULONGEST val;
int offset = 0;
int regnum = IA64_GR8_REGNUM;
int reglen = TYPE_LENGTH (ia64_register_type (NULL, IA64_GR8_REGNUM));
int n = TYPE_LENGTH (type) / reglen;
int m = TYPE_LENGTH (type) % reglen;
while (n-- > 0)
{
ULONGEST val;
regcache_cooked_read_unsigned (regcache, regnum, &val);
memcpy ((char *)valbuf + offset, &val, reglen);
offset += reglen;
regnum++;
}
if (m)
{
regcache_cooked_read_unsigned (regcache, regnum, &val);
memcpy ((char *)valbuf + offset, &val, m);
}
}
}
CORE_ADDR
ia64_extract_struct_value_address (struct regcache *regcache)
{
error ("ia64_extract_struct_value_address called and cannot get struct value address");
return 0;
}
static int
is_float_or_hfa_type_recurse (struct type *t, struct type **etp)
{
switch (TYPE_CODE (t))
{
case TYPE_CODE_FLT:
if (*etp)
return TYPE_LENGTH (*etp) == TYPE_LENGTH (t);
else
{
*etp = t;
return 1;
}
break;
case TYPE_CODE_ARRAY:
return
is_float_or_hfa_type_recurse (check_typedef (TYPE_TARGET_TYPE (t)),
etp);
break;
case TYPE_CODE_STRUCT:
{
int i;
for (i = 0; i < TYPE_NFIELDS (t); i++)
if (!is_float_or_hfa_type_recurse
(check_typedef (TYPE_FIELD_TYPE (t, i)), etp))
return 0;
return 1;
}
break;
default:
return 0;
break;
}
}
/* Determine if the given type is one of the floating point types or
and HFA (which is a struct, array, or combination thereof whose
bottom-most elements are all of the same floating point type). */
static struct type *
is_float_or_hfa_type (struct type *t)
{
struct type *et = 0;
return is_float_or_hfa_type_recurse (t, &et) ? et : 0;
}
/* Return 1 if the alignment of T is such that the next even slot
should be used. Return 0, if the next available slot should
be used. (See section 8.5.1 of the IA-64 Software Conventions
and Runtime manual). */
static int
slot_alignment_is_next_even (struct type *t)
{
switch (TYPE_CODE (t))
{
case TYPE_CODE_INT:
case TYPE_CODE_FLT:
if (TYPE_LENGTH (t) > 8)
return 1;
else
return 0;
case TYPE_CODE_ARRAY:
return
slot_alignment_is_next_even (check_typedef (TYPE_TARGET_TYPE (t)));
case TYPE_CODE_STRUCT:
{
int i;
for (i = 0; i < TYPE_NFIELDS (t); i++)
if (slot_alignment_is_next_even
(check_typedef (TYPE_FIELD_TYPE (t, i))))
return 1;
return 0;
}
default:
return 0;
}
}
/* Attempt to find (and return) the global pointer for the given
function.
This is a rather nasty bit of code searchs for the .dynamic section
in the objfile corresponding to the pc of the function we're trying
to call. Once it finds the addresses at which the .dynamic section
lives in the child process, it scans the Elf64_Dyn entries for a
DT_PLTGOT tag. If it finds one of these, the corresponding
d_un.d_ptr value is the global pointer. */
static CORE_ADDR
generic_elf_find_global_pointer (CORE_ADDR faddr)
{
struct obj_section *faddr_sect;
faddr_sect = find_pc_section (faddr);
if (faddr_sect != NULL)
{
struct obj_section *osect;
ALL_OBJFILE_OSECTIONS (faddr_sect->objfile, osect)
{
if (strcmp (osect->the_bfd_section->name, ".dynamic") == 0)
break;
}
if (osect < faddr_sect->objfile->sections_end)
{
CORE_ADDR addr;
addr = osect->addr;
while (addr < osect->endaddr)
{
int status;
LONGEST tag;
char buf[8];
status = target_read_memory (addr, buf, sizeof (buf));
if (status != 0)
break;
tag = extract_signed_integer (buf, sizeof (buf));
if (tag == DT_PLTGOT)
{
CORE_ADDR global_pointer;
status = target_read_memory (addr + 8, buf, sizeof (buf));
if (status != 0)
break;
global_pointer = extract_unsigned_integer (buf, sizeof (buf));
/* The payoff... */
return global_pointer;
}
if (tag == DT_NULL)
break;
addr += 16;
}
}
}
return 0;
}
/* Given a function's address, attempt to find (and return) the
corresponding (canonical) function descriptor. Return 0 if
not found. */
static CORE_ADDR
find_extant_func_descr (CORE_ADDR faddr)
{
struct obj_section *faddr_sect;
/* Return early if faddr is already a function descriptor. */
faddr_sect = find_pc_section (faddr);
if (faddr_sect && strcmp (faddr_sect->the_bfd_section->name, ".opd") == 0)
return faddr;
if (faddr_sect != NULL)
{
struct obj_section *osect;
ALL_OBJFILE_OSECTIONS (faddr_sect->objfile, osect)
{
if (strcmp (osect->the_bfd_section->name, ".opd") == 0)
break;
}
if (osect < faddr_sect->objfile->sections_end)
{
CORE_ADDR addr;
addr = osect->addr;
while (addr < osect->endaddr)
{
int status;
LONGEST faddr2;
char buf[8];
status = target_read_memory (addr, buf, sizeof (buf));
if (status != 0)
break;
faddr2 = extract_signed_integer (buf, sizeof (buf));
if (faddr == faddr2)
return addr;
addr += 16;
}
}
}
return 0;
}
/* Attempt to find a function descriptor corresponding to the
given address. If none is found, construct one on the
stack using the address at fdaptr. */
static CORE_ADDR
find_func_descr (CORE_ADDR faddr, CORE_ADDR *fdaptr)
{
CORE_ADDR fdesc;
fdesc = find_extant_func_descr (faddr);
if (fdesc == 0)
{
CORE_ADDR global_pointer;
char buf[16];
fdesc = *fdaptr;
*fdaptr += 16;
global_pointer = FIND_GLOBAL_POINTER (faddr);
if (global_pointer == 0)
global_pointer = read_register (IA64_GR1_REGNUM);
store_unsigned_integer (buf, 8, faddr);
store_unsigned_integer (buf + 8, 8, global_pointer);
write_memory (fdesc, buf, 16);
}
return fdesc;
}
/* Use the following routine when printing out function pointers
so the user can see the function address rather than just the
function descriptor. */
static CORE_ADDR
ia64_convert_from_func_ptr_addr (CORE_ADDR addr)
{
struct obj_section *s;
s = find_pc_section (addr);
/* check if ADDR points to a function descriptor. */
if (s && strcmp (s->the_bfd_section->name, ".opd") == 0)
return read_memory_unsigned_integer (addr, 8);
return addr;
}
static CORE_ADDR
ia64_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp)
{
return sp & ~0xfLL;
}
static CORE_ADDR
ia64_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr,
struct regcache *regcache, CORE_ADDR bp_addr,
int nargs, struct value **args, CORE_ADDR sp,
int struct_return, CORE_ADDR struct_addr)
{
int argno;
struct value *arg;
struct type *type;
int len, argoffset;
int nslots, rseslots, memslots, slotnum, nfuncargs;
int floatreg;
CORE_ADDR bsp, cfm, pfs, new_bsp, funcdescaddr, pc, global_pointer;
nslots = 0;
nfuncargs = 0;
/* Count the number of slots needed for the arguments. */
for (argno = 0; argno < nargs; argno++)
{
arg = args[argno];
type = check_typedef (VALUE_TYPE (arg));
len = TYPE_LENGTH (type);
if ((nslots & 1) && slot_alignment_is_next_even (type))
nslots++;
if (TYPE_CODE (type) == TYPE_CODE_FUNC)
nfuncargs++;
nslots += (len + 7) / 8;
}
/* Divvy up the slots between the RSE and the memory stack. */
rseslots = (nslots > 8) ? 8 : nslots;
memslots = nslots - rseslots;
/* Allocate a new RSE frame. */
cfm = read_register (IA64_CFM_REGNUM);
bsp = read_register (IA64_BSP_REGNUM);
new_bsp = rse_address_add (bsp, rseslots);
write_register (IA64_BSP_REGNUM, new_bsp);
pfs = read_register (IA64_PFS_REGNUM);
pfs &= 0xc000000000000000LL;
pfs |= (cfm & 0xffffffffffffLL);
write_register (IA64_PFS_REGNUM, pfs);
cfm &= 0xc000000000000000LL;
cfm |= rseslots;
write_register (IA64_CFM_REGNUM, cfm);
/* We will attempt to find function descriptors in the .opd segment,
but if we can't we'll construct them ourselves. That being the
case, we'll need to reserve space on the stack for them. */
funcdescaddr = sp - nfuncargs * 16;
funcdescaddr &= ~0xfLL;
/* Adjust the stack pointer to it's new value. The calling conventions
require us to have 16 bytes of scratch, plus whatever space is
necessary for the memory slots and our function descriptors. */
sp = sp - 16 - (memslots + nfuncargs) * 8;
sp &= ~0xfLL; /* Maintain 16 byte alignment. */
/* Place the arguments where they belong. The arguments will be
either placed in the RSE backing store or on the memory stack.
In addition, floating point arguments or HFAs are placed in
floating point registers. */
slotnum = 0;
floatreg = IA64_FR8_REGNUM;
for (argno = 0; argno < nargs; argno++)
{
struct type *float_elt_type;
arg = args[argno];
type = check_typedef (VALUE_TYPE (arg));
len = TYPE_LENGTH (type);
/* Special handling for function parameters. */
if (len == 8
&& TYPE_CODE (type) == TYPE_CODE_PTR
&& TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC)
{
char val_buf[8];
store_unsigned_integer (val_buf, 8,
find_func_descr (extract_unsigned_integer (VALUE_CONTENTS (arg), 8),
&funcdescaddr));
if (slotnum < rseslots)
write_memory (rse_address_add (bsp, slotnum), val_buf, 8);
else
write_memory (sp + 16 + 8 * (slotnum - rseslots), val_buf, 8);
slotnum++;
continue;
}
/* Normal slots. */
/* Skip odd slot if necessary... */
if ((slotnum & 1) && slot_alignment_is_next_even (type))
slotnum++;
argoffset = 0;
while (len > 0)
{
char val_buf[8];
memset (val_buf, 0, 8);
memcpy (val_buf, VALUE_CONTENTS (arg) + argoffset, (len > 8) ? 8 : len);
if (slotnum < rseslots)
write_memory (rse_address_add (bsp, slotnum), val_buf, 8);
else
write_memory (sp + 16 + 8 * (slotnum - rseslots), val_buf, 8);
argoffset += 8;
len -= 8;
slotnum++;
}
/* Handle floating point types (including HFAs). */
float_elt_type = is_float_or_hfa_type (type);
if (float_elt_type != NULL)
{
argoffset = 0;
len = TYPE_LENGTH (type);
while (len > 0 && floatreg < IA64_FR16_REGNUM)
{
char to[MAX_REGISTER_SIZE];
convert_typed_floating (VALUE_CONTENTS (arg) + argoffset, float_elt_type,
to, builtin_type_ia64_ext);
regcache_cooked_write (regcache, floatreg, (void *)to);
floatreg++;
argoffset += TYPE_LENGTH (float_elt_type);
len -= TYPE_LENGTH (float_elt_type);
}
}
}
/* Store the struct return value in r8 if necessary. */
if (struct_return)
{
regcache_cooked_write_unsigned (regcache, IA64_GR8_REGNUM, (ULONGEST)struct_addr);
}
global_pointer = FIND_GLOBAL_POINTER (func_addr);
if (global_pointer != 0)
write_register (IA64_GR1_REGNUM, global_pointer);
write_register (IA64_BR0_REGNUM, bp_addr);
write_register (sp_regnum, sp);
return sp;
}
static struct frame_id
ia64_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
char buf[8];
CORE_ADDR sp;
frame_unwind_register (next_frame, sp_regnum, buf);
sp = extract_unsigned_integer (buf, 8);
return frame_id_build (sp, frame_pc_unwind (next_frame));
}
static CORE_ADDR
ia64_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
char buf[8];
CORE_ADDR ip, psr, pc;
frame_unwind_register (next_frame, IA64_IP_REGNUM, buf);
ip = extract_unsigned_integer (buf, 8);
frame_unwind_register (next_frame, IA64_PSR_REGNUM, buf);
psr = extract_unsigned_integer (buf, 8);
pc = (ip & ~0xf) | ((psr >> 41) & 3);
return pc;
}
static void
ia64_store_return_value (struct type *type, struct regcache *regcache, const void *valbuf)
{
if (TYPE_CODE (type) == TYPE_CODE_FLT)
{
char to[MAX_REGISTER_SIZE];
convert_typed_floating (valbuf, type, to, builtin_type_ia64_ext);
regcache_cooked_write (regcache, IA64_FR8_REGNUM, (void *)to);
target_store_registers (IA64_FR8_REGNUM);
}
else
regcache_cooked_write (regcache, IA64_GR8_REGNUM, valbuf);
}
static void
ia64_remote_translate_xfer_address (struct gdbarch *gdbarch,
struct regcache *regcache,
CORE_ADDR memaddr, int nr_bytes,
CORE_ADDR *targ_addr, int *targ_len)
{
*targ_addr = memaddr;
*targ_len = nr_bytes;
}
static void
process_note_abi_tag_sections (bfd *abfd, asection *sect, void *obj)
{
int *os_ident_ptr = obj;
const char *name;
unsigned int sectsize;
name = bfd_get_section_name (abfd, sect);
sectsize = bfd_section_size (abfd, sect);
if (strcmp (name, ".note.ABI-tag") == 0 && sectsize > 0)
{
unsigned int name_length, data_length, note_type;
char *note = alloca (sectsize);
bfd_get_section_contents (abfd, sect, note,
(file_ptr) 0, (bfd_size_type) sectsize);
name_length = bfd_h_get_32 (abfd, note);
data_length = bfd_h_get_32 (abfd, note + 4);
note_type = bfd_h_get_32 (abfd, note + 8);
if (name_length == 4 && data_length == 16 && note_type == 1
&& strcmp (note + 12, "GNU") == 0)
{
int os_number = bfd_h_get_32 (abfd, note + 16);
/* The case numbers are from abi-tags in glibc. */
switch (os_number)
{
case 0 :
*os_ident_ptr = ELFOSABI_LINUX;
break;
case 1 :
*os_ident_ptr = ELFOSABI_HURD;
break;
case 2 :
*os_ident_ptr = ELFOSABI_SOLARIS;
break;
default :
internal_error (__FILE__, __LINE__,
"process_note_abi_sections: unknown OS number %d", os_number);
break;
}
}
}
}
static int
ia64_print_insn (bfd_vma memaddr, struct disassemble_info *info)
{
info->bytes_per_line = SLOT_MULTIPLIER;
return print_insn_ia64 (memaddr, info);
}
static struct gdbarch *
ia64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
struct gdbarch *gdbarch;
struct gdbarch_tdep *tdep;
int os_ident;
if (info.abfd != NULL
&& bfd_get_flavour (info.abfd) == bfd_target_elf_flavour)
{
os_ident = elf_elfheader (info.abfd)->e_ident[EI_OSABI];
/* If os_ident is 0, it is not necessarily the case that we're
on a SYSV system. (ELFOSABI_NONE is defined to be 0.)
GNU/Linux uses a note section to record OS/ABI info, but
leaves e_ident[EI_OSABI] zero. So we have to check for note
sections too. */
if (os_ident == 0)
{
bfd_map_over_sections (info.abfd,
process_note_abi_tag_sections,
&os_ident);
}
}
else
os_ident = -1;
for (arches = gdbarch_list_lookup_by_info (arches, &info);
arches != NULL;
arches = gdbarch_list_lookup_by_info (arches->next, &info))
{
tdep = gdbarch_tdep (arches->gdbarch);
if (tdep &&tdep->os_ident == os_ident)
return arches->gdbarch;
}
tdep = xmalloc (sizeof (struct gdbarch_tdep));
gdbarch = gdbarch_alloc (&info, tdep);
tdep->os_ident = os_ident;
/* Set the method of obtaining the sigcontext addresses at which
registers are saved. The method of checking to see if
native_find_global_pointer is nonzero to indicate that we're
on AIX is kind of hokey, but I can't think of a better way
to do it. */
if (os_ident == ELFOSABI_LINUX)
tdep->sigcontext_register_address = ia64_linux_sigcontext_register_address;
else if (native_find_global_pointer != 0)
tdep->sigcontext_register_address = ia64_aix_sigcontext_register_address;
else
tdep->sigcontext_register_address = 0;
/* We know that GNU/Linux won't have to resort to the
native_find_global_pointer hackery. But that's the only one we
know about so far, so if native_find_global_pointer is set to
something non-zero, then use it. Otherwise fall back to using
generic_elf_find_global_pointer. This arrangement should (in
theory) allow us to cross debug GNU/Linux binaries from an AIX
machine. */
if (os_ident == ELFOSABI_LINUX)
tdep->find_global_pointer = generic_elf_find_global_pointer;
else if (native_find_global_pointer != 0)
tdep->find_global_pointer = native_find_global_pointer;
else
tdep->find_global_pointer = generic_elf_find_global_pointer;
/* Define the ia64 floating-point format to gdb. */
builtin_type_ia64_ext =
init_type (TYPE_CODE_FLT, 128 / 8,
0, "builtin_type_ia64_ext", NULL);
TYPE_FLOATFORMAT (builtin_type_ia64_ext) = &floatformat_ia64_ext;
set_gdbarch_short_bit (gdbarch, 16);
set_gdbarch_int_bit (gdbarch, 32);
set_gdbarch_long_bit (gdbarch, 64);
set_gdbarch_long_long_bit (gdbarch, 64);
set_gdbarch_float_bit (gdbarch, 32);
set_gdbarch_double_bit (gdbarch, 64);
set_gdbarch_long_double_bit (gdbarch, 128);
set_gdbarch_ptr_bit (gdbarch, 64);
set_gdbarch_num_regs (gdbarch, NUM_IA64_RAW_REGS);
set_gdbarch_num_pseudo_regs (gdbarch, LAST_PSEUDO_REGNUM - FIRST_PSEUDO_REGNUM);
set_gdbarch_sp_regnum (gdbarch, sp_regnum);
set_gdbarch_fp0_regnum (gdbarch, IA64_FR0_REGNUM);
set_gdbarch_register_name (gdbarch, ia64_register_name);
/* FIXME: Following interface should not be needed, however, without it recurse.exp
gets a number of extra failures. */
set_gdbarch_deprecated_register_size (gdbarch, 8);
set_gdbarch_register_type (gdbarch, ia64_register_type);
set_gdbarch_pseudo_register_read (gdbarch, ia64_pseudo_register_read);
set_gdbarch_pseudo_register_write (gdbarch, ia64_pseudo_register_write);
set_gdbarch_dwarf2_reg_to_regnum (gdbarch, ia64_dwarf_reg_to_regnum);
set_gdbarch_register_reggroup_p (gdbarch, ia64_register_reggroup_p);
set_gdbarch_convert_register_p (gdbarch, ia64_convert_register_p);
set_gdbarch_register_to_value (gdbarch, ia64_register_to_value);
set_gdbarch_value_to_register (gdbarch, ia64_value_to_register);
set_gdbarch_skip_prologue (gdbarch, ia64_skip_prologue);
set_gdbarch_use_struct_convention (gdbarch, ia64_use_struct_convention);
set_gdbarch_extract_return_value (gdbarch, ia64_extract_return_value);
set_gdbarch_store_return_value (gdbarch, ia64_store_return_value);
set_gdbarch_extract_struct_value_address (gdbarch, ia64_extract_struct_value_address);
set_gdbarch_memory_insert_breakpoint (gdbarch, ia64_memory_insert_breakpoint);
set_gdbarch_memory_remove_breakpoint (gdbarch, ia64_memory_remove_breakpoint);
set_gdbarch_breakpoint_from_pc (gdbarch, ia64_breakpoint_from_pc);
set_gdbarch_read_pc (gdbarch, ia64_read_pc);
set_gdbarch_write_pc (gdbarch, ia64_write_pc);
/* Settings for calling functions in the inferior. */
set_gdbarch_push_dummy_call (gdbarch, ia64_push_dummy_call);
set_gdbarch_frame_align (gdbarch, ia64_frame_align);
set_gdbarch_unwind_dummy_id (gdbarch, ia64_unwind_dummy_id);
set_gdbarch_unwind_pc (gdbarch, ia64_unwind_pc);
frame_unwind_append_sniffer (gdbarch, ia64_sigtramp_frame_sniffer);
frame_unwind_append_sniffer (gdbarch, ia64_frame_sniffer);
frame_base_set_default (gdbarch, &ia64_frame_base);
/* Settings that should be unnecessary. */
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
set_gdbarch_decr_pc_after_break (gdbarch, 0);
set_gdbarch_function_start_offset (gdbarch, 0);
set_gdbarch_frame_args_skip (gdbarch, 0);
set_gdbarch_remote_translate_xfer_address (
gdbarch, ia64_remote_translate_xfer_address);
set_gdbarch_print_insn (gdbarch, ia64_print_insn);
set_gdbarch_convert_from_func_ptr_addr (gdbarch, ia64_convert_from_func_ptr_addr);
return gdbarch;
}
extern initialize_file_ftype _initialize_ia64_tdep; /* -Wmissing-prototypes */
void
_initialize_ia64_tdep (void)
{
register_gdbarch_init (bfd_arch_ia64, ia64_gdbarch_init);
}
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