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Code Issues Releases Activity

Use flags from eh_elfs

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This commit is contained in:
Théophile Bastian 2018-06-27 11:38:44 +02:00
parent b47bfdd204
commit e8941a4c73
2 changed files with 27 additions and 10 deletions
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12
src/eh_elf/context_struct.h
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@ -1,7 +1,17 @@
#include <stdint.h> #include <stdint.h>
typedef enum {
UNWF_RIP=0,
UNWF_RSP=1,
UNWF_RBP=2,
UNWF_RBX=3,
UNWF_ERROR=7
} unwind_flags_t;
typedef struct { typedef struct {
uintptr_t rip, rsp, rbp; uint8_t flags;
uintptr_t rip, rsp, rbp, rbx;
} unwind_context_t; } unwind_context_t;
typedef uintptr_t (*deref_func_t)(uintptr_t); typedef uintptr_t (*deref_func_t)(uintptr_t);

25
src/eh_elf/eh_elf.c
View file

@ -58,8 +58,8 @@ static uintptr_t fetchw_here(uintptr_t addr) {
return out; return out;
} }
dwarf_loc_t of_eh_elf_loc(uintptr_t eh_elf_loc) { dwarf_loc_t of_eh_elf_loc(uintptr_t eh_elf_loc, uint8_t flags, int flag_id) {
if(eh_elf_loc + 1 == 0) // Undefined if((flags & (1 << flag_id)) == 0)
return DWARF_NULL_LOC; return DWARF_NULL_LOC;
return DWARF_LOC(eh_elf_loc, DWARF_LOC_TYPE_VAL); return DWARF_LOC(eh_elf_loc, DWARF_LOC_TYPE_VAL);
} }
@ -106,6 +106,8 @@ int eh_elf_step_cursor(struct cursor *cursor) {
eh_elf_context.rsp = cursor->dwarf.cfa; eh_elf_context.rsp = cursor->dwarf.cfa;
dwarf_get(&cursor->dwarf, dwarf_get(&cursor->dwarf,
cursor->dwarf.loc[UNW_TDEP_BP], &eh_elf_context.rbp); cursor->dwarf.loc[UNW_TDEP_BP], &eh_elf_context.rbp);
dwarf_get(&cursor->dwarf,
cursor->dwarf.loc[UNW_X86_64_RBX], &eh_elf_context.rbx);
// Set _fetch_state before passing fetchw_here // Set _fetch_state before passing fetchw_here
_fetch_state.cursor = cursor; _fetch_state.cursor = cursor;
@ -116,6 +118,7 @@ int eh_elf_step_cursor(struct cursor *cursor) {
ip - mmap_entry->offset, ip - mmap_entry->offset,
eh_elf_context.rsp); eh_elf_context.rsp);
eh_elf_context.flags = 0;
// Call fde_func // Call fde_func
eh_elf_context = fde_func( eh_elf_context = fde_func(
eh_elf_context, eh_elf_context,
@ -127,11 +130,10 @@ int eh_elf_step_cursor(struct cursor *cursor) {
return -4; return -4;
} }
if(eh_elf_context.rbp + 1 == 0 if(((eh_elf_context.flags & (1 << UNWF_ERROR))) != 0) {
&& eh_elf_context.rsp + 1 == 0
&& eh_elf_context.rip + 1 == 0) {
// Error, somehow // Error, somehow
Debug(2, "eh_elf unwinding FAILED\n"); Debug(3, "eh_elf unwinding FAILED (fl=%02x), IP=0x%016lx\n",
eh_elf_context.flags, ip);
return -3; return -3;
} }
@ -150,9 +152,14 @@ int eh_elf_step_cursor(struct cursor *cursor) {
for (int i = 0; i < DWARF_NUM_PRESERVED_REGS; ++i) for (int i = 0; i < DWARF_NUM_PRESERVED_REGS; ++i)
cursor->dwarf.loc[i] = DWARF_NULL_LOC; cursor->dwarf.loc[i] = DWARF_NULL_LOC;
cursor->dwarf.loc[UNW_TDEP_BP] = of_eh_elf_loc(eh_elf_context.rbp); cursor->dwarf.loc[UNW_TDEP_BP] = of_eh_elf_loc(
cursor->dwarf.loc[UNW_TDEP_SP] = of_eh_elf_loc(eh_elf_context.rsp); eh_elf_context.rbp, eh_elf_context.flags, UNWF_RBP);
cursor->dwarf.loc[UNW_TDEP_IP] = of_eh_elf_loc(eh_elf_context.rip); 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);
cursor->dwarf.use_prev_instr = 0; cursor->dwarf.use_prev_instr = 0;
cursor->frame_info.frame_type = UNW_X86_64_FRAME_GUESSED; cursor->frame_info.frame_type = UNW_X86_64_FRAME_GUESSED;