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https://github.com/darlinghq/darling-gdb.git
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2010-08-30 Yao Qi <yao@codesourcery.com>
* arm-linux-tdep.c (arm_linux_sigreturn_return_addr): New. (arm_linux_syscall_next_pc): New. (arm_linux_copy_svc): Use arm_linux_sigreturn_return_addr instead. (arm_linux_init_abi): Initialize syscall_next_pc. * arm-tdep.c (thumb_get_next_pc_raw): Get next pc of SWI in Thumb mode. (arm_get_next_pc_raw): Get next pc of SWI in ARM mode. * arm-tdep.h (struct gdbarch_tdep): Add a function pointer syscall_next_pc. Declare arm_frame_is_thumb.
This commit is contained in:
Yao Qi
parent
eb34ac7a77
commit
25b41d01ea
@ -1,3 +1,14 @@
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2010-08-30 Yao Qi <yao@codesourcery.com>
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* arm-linux-tdep.c (arm_linux_sigreturn_return_addr): New.
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(arm_linux_syscall_next_pc): New.
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(arm_linux_copy_svc): Use arm_linux_sigreturn_return_addr instead.
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(arm_linux_init_abi): Initialize syscall_next_pc.
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* arm-tdep.c (thumb_get_next_pc_raw): Get next pc of SWI in Thumb mode.
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(arm_get_next_pc_raw): Get next pc of SWI in ARM mode.
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* arm-tdep.h (struct gdbarch_tdep): Add a function pointer syscall_next_pc.
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Declare arm_frame_is_thumb.
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2010-08-30 Jan Kratochvil <jan.kratochvil@redhat.com>
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Code cleanup.
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@ -630,6 +630,82 @@ arm_linux_regset_from_core_section (struct gdbarch *gdbarch,
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return NULL;
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}
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/* Copy the value of next pc of sigreturn and rt_sigrturn into PC,
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and return 1. Return 0 if it is not a rt_sigreturn/sigreturn
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syscall. */
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static int
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arm_linux_sigreturn_return_addr (struct frame_info *frame,
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unsigned long svc_number,
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CORE_ADDR *pc)
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{
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/* Is this a sigreturn or rt_sigreturn syscall? */
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if (svc_number == 119 || svc_number == 173)
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{
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if (get_frame_type (frame) == SIGTRAMP_FRAME)
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{
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*pc = frame_unwind_caller_pc (frame);
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return 1;
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}
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}
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return 0;
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}
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/* When FRAME is at a syscall instruction, return the PC of the next
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instruction to be executed. */
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static CORE_ADDR
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arm_linux_syscall_next_pc (struct frame_info *frame)
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{
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CORE_ADDR pc = get_frame_pc (frame);
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CORE_ADDR return_addr = 0;
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int is_thumb = arm_frame_is_thumb (frame);
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ULONGEST svc_number = 0;
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int is_sigreturn = 0;
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if (is_thumb)
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{
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svc_number = get_frame_register_unsigned (frame, 7);
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}
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else
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{
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struct gdbarch *gdbarch = get_frame_arch (frame);
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enum bfd_endian byte_order_for_code =
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gdbarch_byte_order_for_code (gdbarch);
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unsigned long this_instr =
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read_memory_unsigned_integer (pc, 4, byte_order_for_code);
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unsigned long svc_operand = (0x00ffffff & this_instr);
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if (svc_operand) /* OABI. */
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{
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svc_number = svc_operand - 0x900000;
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}
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else /* EABI. */
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{
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svc_number = get_frame_register_unsigned (frame, 7);
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}
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}
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is_sigreturn = arm_linux_sigreturn_return_addr (frame, svc_number,
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&return_addr);
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if (is_sigreturn)
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return return_addr;
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if (is_thumb)
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{
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return_addr = pc + 2;
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/* Addresses for calling Thumb functions have the bit 0 set. */
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return_addr |= 1;
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}
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else
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{
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return_addr = pc + 4;
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}
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return return_addr;
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}
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/* Insert a single step breakpoint at the next executed instruction. */
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static int
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@ -688,8 +764,11 @@ arm_linux_copy_svc (struct gdbarch *gdbarch, uint32_t insn, CORE_ADDR to,
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struct regcache *regs, struct displaced_step_closure *dsc)
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{
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CORE_ADDR from = dsc->insn_addr;
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CORE_ADDR return_to = 0;
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struct frame_info *frame;
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unsigned int svc_number = displaced_read_reg (regs, from, 7);
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int is_sigreturn = 0;
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if (debug_displaced)
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fprintf_unfiltered (gdb_stdlog, "displaced: copying Linux svc insn %.8lx\n",
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@ -697,13 +776,10 @@ arm_linux_copy_svc (struct gdbarch *gdbarch, uint32_t insn, CORE_ADDR to,
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frame = get_current_frame ();
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/* Is this a sigreturn or rt_sigreturn syscall? Note: these are only useful
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for EABI. */
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if (svc_number == 119 || svc_number == 173)
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is_sigreturn = arm_linux_sigreturn_return_addr(frame, svc_number,
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&return_to);
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if (is_sigreturn)
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{
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if (get_frame_type (frame) == SIGTRAMP_FRAME)
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{
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CORE_ADDR return_to;
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struct symtab_and_line sal;
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if (debug_displaced)
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@ -711,7 +787,6 @@ arm_linux_copy_svc (struct gdbarch *gdbarch, uint32_t insn, CORE_ADDR to,
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"sigreturn/rt_sigreturn SVC call. PC in frame = %lx\n",
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(unsigned long) get_frame_pc (frame));
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return_to = frame_unwind_caller_pc (frame);
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if (debug_displaced)
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fprintf_unfiltered (gdb_stdlog, "displaced: unwind pc = %lx. "
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"Setting momentary breakpoint.\n", (unsigned long) return_to);
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@ -743,7 +818,7 @@ arm_linux_copy_svc (struct gdbarch *gdbarch, uint32_t insn, CORE_ADDR to,
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else if (debug_displaced)
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fprintf_unfiltered (gdb_stdlog, "displaced: sigreturn/rt_sigreturn "
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"SVC call not in signal trampoline frame\n");
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}
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/* Preparation: If we detect sigreturn, set momentary breakpoint at resume
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location, else nothing.
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@ -946,6 +1021,9 @@ arm_linux_init_abi (struct gdbarch_info info,
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set_gdbarch_displaced_step_free_closure (gdbarch,
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simple_displaced_step_free_closure);
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set_gdbarch_displaced_step_location (gdbarch, displaced_step_at_entry_point);
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tdep->syscall_next_pc = arm_linux_syscall_next_pc;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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@ -270,7 +270,7 @@ arm_psr_thumb_bit (struct gdbarch *gdbarch)
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/* Determine if FRAME is executing in Thumb mode. */
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static int
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int
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arm_frame_is_thumb (struct frame_info *frame)
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{
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CORE_ADDR cpsr;
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@ -2828,7 +2828,16 @@ thumb_get_next_pc_raw (struct frame_info *frame, CORE_ADDR pc, int insert_bkpt)
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else if ((inst1 & 0xf000) == 0xd000) /* conditional branch */
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{
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unsigned long cond = bits (inst1, 8, 11);
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if (cond != 0x0f && condition_true (cond, status)) /* 0x0f = SWI */
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if (cond == 0x0f) /* 0x0f = SWI */
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{
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struct gdbarch_tdep *tdep;
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tdep = gdbarch_tdep (gdbarch);
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if (tdep->syscall_next_pc != NULL)
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nextpc = tdep->syscall_next_pc (frame);
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}
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else if (cond != 0x0f && condition_true (cond, status))
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nextpc = pc_val + (sbits (inst1, 0, 7) << 1);
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}
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else if ((inst1 & 0xf800) == 0xe000) /* unconditional branch */
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@ -3277,7 +3286,16 @@ arm_get_next_pc_raw (struct frame_info *frame, CORE_ADDR pc, int insert_bkpt)
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case 0xc:
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case 0xd:
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case 0xe: /* coproc ops */
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break;
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case 0xf: /* SWI */
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{
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struct gdbarch_tdep *tdep;
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tdep = gdbarch_tdep (gdbarch);
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if (tdep->syscall_next_pc != NULL)
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nextpc = tdep->syscall_next_pc (frame);
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}
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break;
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default:
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@ -196,6 +196,10 @@ struct gdbarch_tdep
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struct type *arm_ext_type;
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struct type *neon_double_type;
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struct type *neon_quad_type;
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/* Return the expected next PC if FRAME is stopped at a syscall
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instruction. */
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CORE_ADDR (*syscall_next_pc) (struct frame_info *frame);
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};
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/* Structures used for displaced stepping. */
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@ -297,6 +301,7 @@ extern void
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CORE_ADDR arm_skip_stub (struct frame_info *, CORE_ADDR);
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CORE_ADDR arm_get_next_pc (struct frame_info *, CORE_ADDR);
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int arm_software_single_step (struct frame_info *);
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int arm_frame_is_thumb (struct frame_info *frame);
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extern struct displaced_step_closure *
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arm_displaced_step_copy_insn (struct gdbarch *, CORE_ADDR, CORE_ADDR,
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