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gdb: LoongArch: Implement loongarch_linux_syscall_next_pc()
When FRAME is at a syscall instruction, return the PC of the next instruction to be executed. Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
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@ -161,11 +161,35 @@ loongarch_iterate_over_regset_sections (struct gdbarch *gdbarch,
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LOONGARCH_LINUX_NUM_GREGSET * regsize, &loongarch_gregset, NULL, cb_data);
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LOONGARCH_LINUX_NUM_GREGSET * regsize, &loongarch_gregset, NULL, cb_data);
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}
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}
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/* The following value is derived from __NR_rt_sigreturn in
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<include/uapi/asm-generic/unistd.h> from the Linux source tree. */
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#define LOONGARCH_NR_rt_sigreturn 139
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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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loongarch_linux_syscall_next_pc (struct frame_info *frame)
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{
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const CORE_ADDR pc = get_frame_pc (frame);
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ULONGEST a7 = get_frame_register_unsigned (frame, LOONGARCH_A7_REGNUM);
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/* If we are about to make a sigreturn syscall, use the unwinder to
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decode the signal frame. */
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if (a7 == LOONGARCH_NR_rt_sigreturn)
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return frame_unwind_caller_pc (frame);
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return pc + 4;
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}
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/* Initialize LoongArch Linux ABI info. */
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/* Initialize LoongArch Linux ABI info. */
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static void
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static void
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loongarch_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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loongarch_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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{
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loongarch_gdbarch_tdep *tdep = (loongarch_gdbarch_tdep *) gdbarch_tdep (gdbarch);
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linux_init_abi (info, gdbarch, 0);
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linux_init_abi (info, gdbarch, 0);
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set_solib_svr4_fetch_link_map_offsets (gdbarch,
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set_solib_svr4_fetch_link_map_offsets (gdbarch,
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@ -187,6 +211,8 @@ loongarch_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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/* Core file support. */
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/* Core file support. */
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set_gdbarch_iterate_over_regset_sections (gdbarch, loongarch_iterate_over_regset_sections);
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set_gdbarch_iterate_over_regset_sections (gdbarch, loongarch_iterate_over_regset_sections);
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tdep->syscall_next_pc = loongarch_linux_syscall_next_pc;
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}
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}
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/* Initialize LoongArch Linux target support. */
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/* Initialize LoongArch Linux target support. */
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@ -224,6 +224,8 @@ loongarch_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
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static CORE_ADDR
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static CORE_ADDR
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loongarch_next_pc (struct regcache *regcache, CORE_ADDR cur_pc)
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loongarch_next_pc (struct regcache *regcache, CORE_ADDR cur_pc)
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{
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{
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struct gdbarch *gdbarch = regcache->arch ();
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loongarch_gdbarch_tdep *tdep = (loongarch_gdbarch_tdep *) gdbarch_tdep (gdbarch);
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insn_t insn = loongarch_fetch_instruction (cur_pc);
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insn_t insn = loongarch_fetch_instruction (cur_pc);
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size_t insn_len = loongarch_insn_length (insn);
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size_t insn_len = loongarch_insn_length (insn);
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CORE_ADDR next_pc = cur_pc + insn_len;
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CORE_ADDR next_pc = cur_pc + insn_len;
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@ -307,6 +309,11 @@ loongarch_next_pc (struct regcache *regcache, CORE_ADDR cur_pc)
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if (rj != 0)
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if (rj != 0)
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next_pc = cur_pc + loongarch_decode_imm ("0:5|10:16<<2", insn, 1);
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next_pc = cur_pc + loongarch_decode_imm ("0:5|10:16<<2", insn, 1);
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}
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}
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else if ((insn & 0xffff8000) == 0x002b0000) /* syscall */
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{
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if (tdep->syscall_next_pc != nullptr)
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next_pc = tdep->syscall_next_pc (get_current_frame ());
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}
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return next_pc;
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return next_pc;
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}
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}
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@ -48,6 +48,9 @@ struct loongarch_gdbarch_tdep : gdbarch_tdep
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{
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{
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/* Features about the abi that impact how the gdbarch is configured. */
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/* Features about the abi that impact how the gdbarch is configured. */
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struct loongarch_gdbarch_features abi_features;
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struct loongarch_gdbarch_features abi_features;
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/* Return the expected next PC if FRAME is stopped at a syscall instruction. */
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CORE_ADDR (*syscall_next_pc) (struct frame_info *frame) = nullptr;
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};
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};
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#endif /* LOONGARCH_TDEP_H */
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#endif /* LOONGARCH_TDEP_H */
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