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* rs6000-tdep.c (rs6000_use_struct_convention)

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(rs6000_extract_return_value, rs6000_store_return_value)
(rs6000_extract_struct_value_address): Remove.
(rs6000_return_value): New function.
(rs6000_gdbarch_init): Don't set deprecated_extract_return_value,
store_return_value, deprecated_extract_struct_value_address and
deprecated_use_struct_convention.  Use rs6000_return_value
instead.
This commit is contained in:
Mark Kettenis 2007-01-02 19:21:13 +00:00
parent e661586e7c
commit d217aaedaf
2 changed files with 119 additions and 132 deletions
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11
gdb/ChangeLog
View file

@ -1,3 +1,14 @@
2007-01-01 Mark Kettenis <kettenis@gnu.org>
* rs6000-tdep.c (rs6000_use_struct_convention)
(rs6000_extract_return_value, rs6000_store_return_value)
(rs6000_extract_struct_value_address): Remove.
(rs6000_return_value): New function.
(rs6000_gdbarch_init): Don't set deprecated_extract_return_value,
store_return_value, deprecated_extract_struct_value_address and
deprecated_use_struct_convention. Use rs6000_return_value
instead.
2007-01-02 Nick Roberts <nickrob@snap.net.nz>
* mi/mi-cmds.c (mi_cmds): Remove entries for -display-delete,

240
gdb/rs6000-tdep.c
View file

@ -1,7 +1,7 @@
/* Target-dependent code for GDB, the GNU debugger.
Copyright (C) 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996,
1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
Free Software Foundation, Inc.
This file is part of GDB.
@ -1734,61 +1734,124 @@ ran_out_of_registers_for_arguments:
return sp;
}
/* PowerOpen always puts structures in memory. Vectors, which were
added later, do get returned in a register though. */
static int
rs6000_use_struct_convention (int gcc_p, struct type *value_type)
{
if ((TYPE_LENGTH (value_type) == 16 || TYPE_LENGTH (value_type) == 8)
&& TYPE_VECTOR (value_type))
return 0;
return 1;
}
static void
rs6000_extract_return_value (struct type *valtype, gdb_byte *regbuf,
gdb_byte *valbuf)
static enum return_value_convention
rs6000_return_value (struct gdbarch *gdbarch, struct type *valtype,
struct regcache *regcache, gdb_byte *readbuf,
const gdb_byte *writebuf)
{
int offset = 0;
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
gdb_byte buf[8];
/* The calling convention this function implements assumes the
processor has floating-point registers. We shouldn't be using it
on PPC variants that lack them. */
on PowerPC variants that lack them. */
gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
/* AltiVec extension: Functions that declare a vector data type as a
return value place that return value in VR2. */
if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY && TYPE_VECTOR (valtype)
&& TYPE_LENGTH (valtype) == 16)
{
if (readbuf)
regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf);
if (writebuf)
regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, writebuf);
/* floats and doubles are returned in fpr1. fpr's have a size of 8 bytes.
We need to truncate the return value into float size (4 byte) if
necessary. */
convert_typed_floating (&regbuf[DEPRECATED_REGISTER_BYTE
(tdep->ppc_fp0_regnum + 1)],
builtin_type_double,
valbuf,
valtype);
return RETURN_VALUE_REGISTER_CONVENTION;
}
else if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY
&& TYPE_LENGTH (valtype) == 16
&& TYPE_VECTOR (valtype))
/* If the called subprogram returns an aggregate, there exists an
implicit first argument, whose value is the address of a caller-
allocated buffer into which the callee is assumed to store its
return value. All explicit parameters are appropriately
relabeled. */
if (TYPE_CODE (valtype) == TYPE_CODE_STRUCT
|| TYPE_CODE (valtype) == TYPE_CODE_UNION
|| TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
return RETURN_VALUE_STRUCT_CONVENTION;
/* Scalar floating-point values are returned in FPR1 for float or
double, and in FPR1:FPR2 for quadword precision. Fortran
complex*8 and complex*16 are returned in FPR1:FPR2, and
complex*32 is returned in FPR1:FPR4. */
if (TYPE_CODE (valtype) == TYPE_CODE_FLT
&& (TYPE_LENGTH (valtype) == 4 || TYPE_LENGTH (valtype) == 8))
{
memcpy (valbuf, regbuf + DEPRECATED_REGISTER_BYTE (tdep->ppc_vr0_regnum + 2),
TYPE_LENGTH (valtype));
}
else
{
/* return value is copied starting from r3. */
if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG
&& TYPE_LENGTH (valtype) < register_size (current_gdbarch, 3))
offset = register_size (current_gdbarch, 3) - TYPE_LENGTH (valtype);
struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum);
gdb_byte regval[8];
memcpy (valbuf,
regbuf + DEPRECATED_REGISTER_BYTE (3) + offset,
TYPE_LENGTH (valtype));
/* FIXME: kettenis/2007-01-01: Add support for quadword
precision and complex. */
if (readbuf)
{
regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval);
convert_typed_floating (regval, regtype, readbuf, valtype);
}
if (writebuf)
{
convert_typed_floating (writebuf, valtype, regval, regtype);
regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval);
}
return RETURN_VALUE_REGISTER_CONVENTION;
}
/* Values of the types int, long, short, pointer, and char (length
is less than or equal to four bytes), as well as bit values of
lengths less than or equal to 32 bits, must be returned right
justified in GPR3 with signed values sign extended and unsigned
values zero extended, as necessary. */
if (TYPE_LENGTH (valtype) <= tdep->wordsize)
{
if (readbuf)
{
ULONGEST regval;
/* For reading we don't have to worry about sign extension. */
regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
&regval);
store_unsigned_integer (readbuf, TYPE_LENGTH (valtype), regval);
}
if (writebuf)
{
/* For writing, use unpack_long since that should handle any
required sign extension. */
regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
unpack_long (valtype, writebuf));
}
return RETURN_VALUE_REGISTER_CONVENTION;
}
/* Eight-byte non-floating-point scalar values must be returned in
GPR3:GPR4. */
if (TYPE_LENGTH (valtype) == 8)
{
gdb_assert (TYPE_CODE (valtype) != TYPE_CODE_FLT);
gdb_assert (tdep->wordsize == 4);
if (readbuf)
{
gdb_byte regval[8];
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, regval);
regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
regval + 4);
memcpy (readbuf, regval, 8);
}
if (writebuf)
{
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, writebuf);
regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
writebuf + 4);
}
return RETURN_VALUE_REGISTER_CONVENTION;
}
return RETURN_VALUE_STRUCT_CONVENTION;
}
/* Return whether handle_inferior_event() should proceed through code
@ -2242,79 +2305,6 @@ rs6000_dwarf2_reg_to_regnum (int num)
}
}
static void
rs6000_store_return_value (struct type *type,
struct regcache *regcache,
const gdb_byte *valbuf)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
int regnum = -1;
/* The calling convention this function implements assumes the
processor has floating-point registers. We shouldn't be using it
on PPC variants that lack them. */
gdb_assert (ppc_floating_point_unit_p (gdbarch));
if (TYPE_CODE (type) == TYPE_CODE_FLT)
/* Floating point values are returned starting from FPR1 and up.
Say a double_double_double type could be returned in
FPR1/FPR2/FPR3 triple. */
regnum = tdep->ppc_fp0_regnum + 1;
else if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
{
if (TYPE_LENGTH (type) == 16
&& TYPE_VECTOR (type))
regnum = tdep->ppc_vr0_regnum + 2;
else
internal_error (__FILE__, __LINE__,
_("rs6000_store_return_value: "
"unexpected array return type"));
}
else
/* Everything else is returned in GPR3 and up. */
regnum = tdep->ppc_gp0_regnum + 3;
{
size_t bytes_written = 0;
while (bytes_written < TYPE_LENGTH (type))
{
/* How much of this value can we write to this register? */
size_t bytes_to_write = min (TYPE_LENGTH (type) - bytes_written,
register_size (gdbarch, regnum));
regcache_cooked_write_part (regcache, regnum,
0, bytes_to_write,
valbuf + bytes_written);
regnum++;
bytes_written += bytes_to_write;
}
}
}
/* Extract from an array REGBUF containing the (raw) register state
the address in which a function should return its structure value,
as a CORE_ADDR (or an expression that can be used as one). */
static CORE_ADDR
rs6000_extract_struct_value_address (struct regcache *regcache)
{
/* FIXME: cagney/2002-09-26: PR gdb/724: When making an inferior
function call GDB knows the address of the struct return value
and hence, should not need to call this function. Unfortunately,
the current call_function_by_hand() code only saves the most
recent struct address leading to occasional calls. The code
should instead maintain a stack of such addresses (in the dummy
frame object). */
/* NOTE: cagney/2002-09-26: Return 0 which indicates that we've
really got no idea where the return value is being stored. While
r3, on function entry, contained the address it will have since
been reused (scratch) and hence wouldn't be valid */
return 0;
}
/* Hook called when a new child process is started. */
void
@ -3307,10 +3297,7 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
else if (sysv_abi && wordsize == 4)
set_gdbarch_return_value (gdbarch, ppc_sysv_abi_return_value);
else
{
set_gdbarch_deprecated_extract_return_value (gdbarch, rs6000_extract_return_value);
set_gdbarch_store_return_value (gdbarch, rs6000_store_return_value);
}
set_gdbarch_return_value (gdbarch, rs6000_return_value);
/* Set lr_frame_offset. */
if (wordsize == 8)
@ -3413,13 +3400,7 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
set_gdbarch_stab_reg_to_regnum (gdbarch, rs6000_stab_reg_to_regnum);
set_gdbarch_dwarf2_reg_to_regnum (gdbarch, rs6000_dwarf2_reg_to_regnum);
/* Note: kevinb/2002-04-12: I'm not convinced that rs6000_push_arguments()
is correct for the SysV ABI when the wordsize is 8, but I'm also
fairly certain that ppc_sysv_abi_push_arguments() will give even
worse results since it only works for 32-bit code. So, for the moment,
we're better off calling rs6000_push_arguments() since it works for
64-bit code. At some point in the future, this matter needs to be
revisited. */
if (sysv_abi && wordsize == 4)
set_gdbarch_push_dummy_call (gdbarch, ppc_sysv_abi_push_dummy_call);
else if (sysv_abi && wordsize == 8)
@ -3427,8 +3408,6 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
else
set_gdbarch_push_dummy_call (gdbarch, rs6000_push_dummy_call);
set_gdbarch_deprecated_extract_struct_value_address (gdbarch, rs6000_extract_struct_value_address);
set_gdbarch_skip_prologue (gdbarch, rs6000_skip_prologue);
set_gdbarch_in_function_epilogue_p (gdbarch, rs6000_in_function_epilogue_p);
@ -3447,9 +3426,6 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
/* Not sure on this. FIXMEmgo */
set_gdbarch_frame_args_skip (gdbarch, 8);
if (!sysv_abi)
set_gdbarch_deprecated_use_struct_convention (gdbarch, rs6000_use_struct_convention);
if (!sysv_abi)
{
/* Handle RS/6000 function pointers (which are really function