forked from Imagelibrary/binutils-gdb
* Makefile.in (frv-linux-tdep.o): Add dependencies.
* frv-linux-tdep.c: New file. * frv-tdep.c (struct gdbarch_tdep): Add new field ``sigcontext_reg_addr''. (frv_set_sigcontext_reg_addr, frv_sigtramp,frame_cache) (frv_sigtramp_frame_this_id, frv_sigtramp_frame_prev_register) (frv_sigramp_frame_sniffer): New functions. (frv_sigtramp_frame_unwind): New static global. (frv_gdbarch_init): Hook in ABI-specific overrides. Hook up frame sniffers. * frv-tdep.h (frv_set_sigcontext_reg_addr): New function. * config/frv/frv.mt (TDEPFILES): Add frv-linux-tdep.o.
This commit is contained in:
Kevin Buettner
273
gdb/frv-linux-tdep.c
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273
gdb/frv-linux-tdep.c
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/* 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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/* 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, "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/frvnommu/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-frvnommu/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-frvnommu/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-frvnommu/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 CORE_ADDR
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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 the a ucontext struct. The ucontext struct contains
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a sigcontext struct starting 12 bytes in. */
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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 += 12;
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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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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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/* When the FR-V Linux kernel calls a signal handler, the return
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address points to a bit of code on the stack. This function is
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used to identify this bit of code as a signal trampoline in order
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to support backtracing through calls to signal handlers. */
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set_gdbarch_pc_in_sigtramp (gdbarch, frv_linux_pc_in_sigtramp);
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frv_set_sigcontext_reg_addr (gdbarch, frv_linux_sigcontext_reg_addr);
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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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