365 lines
10 KiB
C
365 lines
10 KiB
C
/* Target-dependent code for GNU/Linux running on the Fujitsu FR-V,
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for GDB.
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Copyright 2004 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "target.h"
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#include "frame.h"
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#include "osabi.h"
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#include "elf-bfd.h"
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#include "elf/frv.h"
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#include "frv-tdep.h"
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#include "trad-frame.h"
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#include "frame-unwind.h"
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/* Define the size (in bytes) of an FR-V instruction. */
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static const int frv_instr_size = 4;
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enum {
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NORMAL_SIGTRAMP = 1,
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RT_SIGTRAMP = 2
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};
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static int
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frv_linux_pc_in_sigtramp (CORE_ADDR pc, char *name)
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{
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char buf[frv_instr_size];
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LONGEST instr;
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int retval = 0;
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if (target_read_memory (pc, buf, sizeof buf) != 0)
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return 0;
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instr = extract_unsigned_integer (buf, sizeof buf);
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if (instr == 0x8efc0077) /* setlos #__NR_sigreturn, gr7 */
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retval = NORMAL_SIGTRAMP;
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else if (instr -= 0x8efc00ad) /* setlos #__NR_rt_sigreturn, gr7 */
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retval = RT_SIGTRAMP;
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else
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return 0;
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if (target_read_memory (pc + frv_instr_size, buf, sizeof buf) != 0)
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return 0;
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instr = extract_unsigned_integer (buf, sizeof buf);
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if (instr != 0xc0700000) /* tira gr0, 0 */
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return 0;
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/* If we get this far, we'll return a non-zero value, either
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NORMAL_SIGTRAMP (1) or RT_SIGTRAMP (2). */
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return retval;
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}
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/* Given NEXT_FRAME, the "callee" frame of the sigtramp frame that we
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wish to decode, and REGNO, one of the frv register numbers defined
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in frv-tdep.h, return the address of the saved register (corresponding
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to REGNO) in the sigtramp frame. Return -1 if the register is not
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found in the sigtramp frame. The magic numbers in the code below
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were computed by examining the following kernel structs:
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From arch/frv/kernel/signal.c:
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struct sigframe
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{
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void (*pretcode)(void);
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int sig;
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struct sigcontext sc;
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unsigned long extramask[_NSIG_WORDS-1];
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uint32_t retcode[2];
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};
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struct rt_sigframe
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{
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void (*pretcode)(void);
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int sig;
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struct siginfo *pinfo;
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void *puc;
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struct siginfo info;
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struct ucontext uc;
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uint32_t retcode[2];
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};
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From include/asm-frv/ucontext.h:
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struct ucontext {
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unsigned long uc_flags;
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struct ucontext *uc_link;
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stack_t uc_stack;
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struct sigcontext uc_mcontext;
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sigset_t uc_sigmask;
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};
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From include/asm-frv/signal.h:
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typedef struct sigaltstack {
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void *ss_sp;
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int ss_flags;
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size_t ss_size;
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} stack_t;
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From include/asm-frv/sigcontext.h:
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struct sigcontext {
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struct user_context sc_context;
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unsigned long sc_oldmask;
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} __attribute__((aligned(8)));
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From include/asm-frv/registers.h:
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struct user_int_regs
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{
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unsigned long psr;
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unsigned long isr;
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unsigned long ccr;
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unsigned long cccr;
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unsigned long lr;
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unsigned long lcr;
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unsigned long pc;
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unsigned long __status;
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unsigned long syscallno;
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unsigned long orig_gr8;
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unsigned long gner[2];
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unsigned long long iacc[1];
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union {
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unsigned long tbr;
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unsigned long gr[64];
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};
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};
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struct user_fpmedia_regs
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{
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unsigned long fr[64];
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unsigned long fner[2];
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unsigned long msr[2];
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unsigned long acc[8];
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unsigned char accg[8];
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unsigned long fsr[1];
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};
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struct user_context
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{
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struct user_int_regs i;
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struct user_fpmedia_regs f;
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void *extension;
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} __attribute__((aligned(8))); */
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static LONGEST
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frv_linux_sigcontext_reg_addr (struct frame_info *next_frame, int regno,
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CORE_ADDR *sc_addr_cache_ptr)
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{
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CORE_ADDR sc_addr;
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if (sc_addr_cache_ptr && *sc_addr_cache_ptr)
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{
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sc_addr = *sc_addr_cache_ptr;
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}
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else
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{
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CORE_ADDR pc, sp;
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char buf[4];
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int tramp_type;
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pc = frame_pc_unwind (next_frame);
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tramp_type = frv_linux_pc_in_sigtramp (pc, 0);
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frame_unwind_register (next_frame, sp_regnum, buf);
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sp = extract_unsigned_integer (buf, sizeof buf);
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if (tramp_type == NORMAL_SIGTRAMP)
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{
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/* For a normal sigtramp frame, the sigcontext struct starts
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at SP + 8. */
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sc_addr = sp + 8;
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}
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else if (tramp_type == RT_SIGTRAMP)
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{
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/* For a realtime sigtramp frame, SP + 12 contains a pointer
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to a ucontext struct. The ucontext struct contains a
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sigcontext struct starting 24 bytes in. (The offset of
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uc_mcontext within struct ucontext is derived as follows:
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stack_t is a 12-byte struct and struct sigcontext is
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8-byte aligned. This gives an offset of 8 + 12 + 4 (for
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padding) = 24.) */
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if (target_read_memory (sp + 12, buf, sizeof buf) != 0)
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{
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warning (_("Can't read realtime sigtramp frame."));
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return 0;
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}
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sc_addr = extract_unsigned_integer (buf, sizeof buf);
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sc_addr += 24;
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}
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else
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internal_error (__FILE__, __LINE__, _("not a signal trampoline"));
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if (sc_addr_cache_ptr)
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*sc_addr_cache_ptr = sc_addr;
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}
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switch (regno)
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{
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case psr_regnum :
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return sc_addr + 0;
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/* sc_addr + 4 has "isr", the Integer Status Register. */
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case ccr_regnum :
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return sc_addr + 8;
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case cccr_regnum :
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return sc_addr + 12;
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case lr_regnum :
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return sc_addr + 16;
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case lcr_regnum :
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return sc_addr + 20;
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case pc_regnum :
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return sc_addr + 24;
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/* sc_addr + 28 is __status, the exception status.
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sc_addr + 32 is syscallno, the syscall number or -1.
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sc_addr + 36 is orig_gr8, the original syscall arg #1.
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sc_addr + 40 is gner[0].
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sc_addr + 44 is gner[1]. */
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case iacc0h_regnum :
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return sc_addr + 48;
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case iacc0l_regnum :
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return sc_addr + 52;
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default :
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if (first_gpr_regnum <= regno && regno <= last_gpr_regnum)
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return sc_addr + 56 + 4 * (regno - first_gpr_regnum);
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else if (first_fpr_regnum <= regno && regno <= last_fpr_regnum)
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return sc_addr + 312 + 4 * (regno - first_fpr_regnum);
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else
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return -1; /* not saved. */
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}
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}
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/* Signal trampolines. */
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static struct trad_frame_cache *
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frv_linux_sigtramp_frame_cache (struct frame_info *next_frame, void **this_cache)
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{
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struct trad_frame_cache *cache;
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struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
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CORE_ADDR addr;
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char buf[4];
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int regnum;
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CORE_ADDR sc_addr_cache_val = 0;
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struct frame_id this_id;
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if (*this_cache)
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return *this_cache;
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cache = trad_frame_cache_zalloc (next_frame);
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/* FIXME: cagney/2004-05-01: This is is long standing broken code.
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The frame ID's code address should be the start-address of the
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signal trampoline and not the current PC within that
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trampoline. */
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frame_unwind_register (next_frame, sp_regnum, buf);
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this_id = frame_id_build (extract_unsigned_integer (buf, sizeof buf),
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frame_pc_unwind (next_frame));
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trad_frame_set_id (cache, this_id);
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for (regnum = 0; regnum < frv_num_regs; regnum++)
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{
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LONGEST reg_addr = frv_linux_sigcontext_reg_addr (next_frame, regnum,
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&sc_addr_cache_val);
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if (reg_addr != -1)
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trad_frame_set_reg_addr (cache, regnum, reg_addr);
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}
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*this_cache = cache;
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return cache;
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}
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static void
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frv_linux_sigtramp_frame_this_id (struct frame_info *next_frame, void **this_cache,
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struct frame_id *this_id)
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{
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struct trad_frame_cache *cache =
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frv_linux_sigtramp_frame_cache (next_frame, this_cache);
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trad_frame_get_id (cache, this_id);
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}
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static void
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frv_linux_sigtramp_frame_prev_register (struct frame_info *next_frame,
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void **this_cache,
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int regnum, int *optimizedp,
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enum lval_type *lvalp, CORE_ADDR *addrp,
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int *realnump, void *valuep)
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{
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/* Make sure we've initialized the cache. */
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struct trad_frame_cache *cache =
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frv_linux_sigtramp_frame_cache (next_frame, this_cache);
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trad_frame_get_register (cache, next_frame, regnum, optimizedp, lvalp,
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addrp, realnump, valuep);
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}
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static const struct frame_unwind frv_linux_sigtramp_frame_unwind =
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{
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SIGTRAMP_FRAME,
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frv_linux_sigtramp_frame_this_id,
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frv_linux_sigtramp_frame_prev_register
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};
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static const struct frame_unwind *
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frv_linux_sigtramp_frame_sniffer (struct frame_info *next_frame)
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{
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CORE_ADDR pc = frame_pc_unwind (next_frame);
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char *name;
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find_pc_partial_function (pc, &name, NULL, NULL);
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if (frv_linux_pc_in_sigtramp (pc, name))
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return &frv_linux_sigtramp_frame_unwind;
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return NULL;
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}
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static void
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frv_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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/* Set the sigtramp frame sniffer. */
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frame_unwind_append_sniffer (gdbarch, frv_linux_sigtramp_frame_sniffer);
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}
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static enum gdb_osabi
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frv_linux_elf_osabi_sniffer (bfd *abfd)
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{
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int elf_flags;
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elf_flags = elf_elfheader (abfd)->e_flags;
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/* Assume GNU/Linux if using the FDPIC ABI. If/when another OS shows
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up that uses this ABI, we'll need to start using .note sections
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or some such. */
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if (elf_flags & EF_FRV_FDPIC)
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return GDB_OSABI_LINUX;
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else
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return GDB_OSABI_UNKNOWN;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_frv_linux_tdep (void);
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void
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_initialize_frv_linux_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_frv, 0, GDB_OSABI_LINUX, frv_linux_init_abi);
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gdbarch_register_osabi_sniffer (bfd_arch_frv,
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bfd_target_elf_flavour,
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frv_linux_elf_osabi_sniffer);
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}
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