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Keep non-overridden registers' state after step

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This commit is contained in:
Théophile Bastian 2019-06-09 12:56:17 +02:00
parent 3b01d66203
commit 6da6a389f9
1 changed files with 28 additions and 8 deletions
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36
src/eh_elf/eh_elf.c
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@ -82,6 +82,19 @@ dwarf_loc_t of_eh_elf_loc(uintptr_t eh_elf_loc, uint8_t flags, int flag_id) {
return DWARF_LOC(eh_elf_loc, DWARF_LOC_TYPE_VAL);
}
/** Sets `dest_reg` to `of_eh_elf_loc` if the provided register is not null.
* Else, leave the `dest_reg` as-is. */
int set_dwarf_loc_ifdef(
dwarf_loc_t* dest_reg, uintptr_t eh_elf_loc,
uint8_t flags, int flag_id)
{
if((flags & (1 << flag_id)) != 0) {
*dest_reg = of_eh_elf_loc(eh_elf_loc, flags, flag_id);
return 1;
}
return 0;
}
int eh_elf_step_cursor(struct cursor *cursor) {
uintptr_t ip = cursor->dwarf.ip;
@ -176,17 +189,24 @@ int eh_elf_step_cursor(struct cursor *cursor) {
ip - mmap_entry->offset);
// Push back the data into libunwind's structures
for (int i = 0; i < DWARF_NUM_PRESERVED_REGS; ++i)
cursor->dwarf.loc[i] = DWARF_NULL_LOC;
cursor->dwarf.loc[UNW_TDEP_BP] = of_eh_elf_loc(
eh_elf_context.rbp, eh_elf_context.flags, UNWF_RBP);
cursor->dwarf.loc[UNW_TDEP_SP] = of_eh_elf_loc(
eh_elf_context.rsp, eh_elf_context.flags, UNWF_RSP);
cursor->dwarf.loc[UNW_TDEP_IP] = of_eh_elf_loc(
eh_elf_context.rip, eh_elf_context.flags, UNWF_RIP);
cursor->dwarf.loc[UNW_X86_64_RBX] = of_eh_elf_loc(
eh_elf_context.rbx, eh_elf_context.flags, UNWF_RBX);
set_dwarf_loc_ifdef(
&cursor->dwarf.loc[UNW_TDEP_BP],
eh_elf_context.rbp,
eh_elf_context.flags,
UNWF_RBP);
set_dwarf_loc_ifdef(
&cursor->dwarf.loc[UNW_TDEP_SP],
eh_elf_context.rsp,
eh_elf_context.flags,
UNWF_RSP);
set_dwarf_loc_ifdef(
&cursor->dwarf.loc[UNW_X86_64_RBX],
eh_elf_context.rbx,
eh_elf_context.flags,
UNWF_RBX);
cursor->dwarf.use_prev_instr = 0;
cursor->frame_info.frame_type = UNW_X86_64_FRAME_GUESSED;