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libbacktrace: support FDPIC (1dd5c40)

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This commit is contained in:
Bartosz Taudul
2024-08-24 18:15:52 +02:00
parent 0d0e56dca3
commit e26c34346b
4 changed files with 108 additions and 48 deletions
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public/libbacktrace/elf.cpp
+23 -9
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@@ -643,7 +643,7 @@ elf_symbol_search (const void *vkey, const void *ventry)
static int
elf_initialize_syminfo (struct backtrace_state *state,
uintptr_t base_address,
struct libbacktrace_base_address base_address,
const unsigned char *symtab_data, size_t symtab_size,
const unsigned char *strtab, size_t strtab_size,
backtrace_error_callback error_callback,
@@ -709,7 +709,8 @@ elf_initialize_syminfo (struct backtrace_state *state,
= *(const b_elf_addr *) (opd->data + (sym->st_value - opd->addr));
else
elf_symbols[j].address = sym->st_value;
elf_symbols[j].address += base_address;
elf_symbols[j].address =
libbacktrace_add_base (elf_symbols[j].address, base_address);
elf_symbols[j].size = sym->st_size;
++j;
}
@@ -6517,7 +6518,8 @@ backtrace_uncompress_lzma (struct backtrace_state *state,
static int
elf_add (struct backtrace_state *state, const char *filename, int descriptor,
const unsigned char *memory, size_t memory_size,
uintptr_t base_address, struct elf_ppc64_opd_data *caller_opd,
struct libbacktrace_base_address base_address,
struct elf_ppc64_opd_data *caller_opd,
backtrace_error_callback error_callback, void *data,
fileline *fileline_fn, int *found_sym, int *found_dwarf,
struct dwarf_data **fileline_entry, int exe, int debuginfo,
@@ -7419,6 +7421,7 @@ phdr_callback (struct PhdrIterate *info, void *pdata)
const char *filename;
int descriptor;
int does_not_exist;
struct libbacktrace_base_address base_address;
fileline elf_fileline_fn;
int found_dwarf;
@@ -7448,7 +7451,8 @@ phdr_callback (struct PhdrIterate *info, void *pdata)
return 0;
}
if (elf_add (pd->state, filename, descriptor, NULL, 0, info->dlpi_addr, NULL,
base_address.m = info->dlpi_addr;
if (elf_add (pd->state, filename, descriptor, NULL, 0, base_address, NULL,
pd->error_callback, pd->data, &elf_fileline_fn, pd->found_sym,
&found_dwarf, NULL, 0, 0, NULL, 0))
{
@@ -7537,11 +7541,21 @@ backtrace_initialize (struct backtrace_state *state, const char *filename,
fileline elf_fileline_fn = elf_nodebug;
struct phdr_data pd;
ret = elf_add (state, filename, descriptor, NULL, 0, 0, NULL, error_callback,
data, &elf_fileline_fn, &found_sym, &found_dwarf, NULL, 1, 0,
NULL, 0);
if (!ret)
return 0;
/* When using fdpic we must use dl_iterate_phdr for all modules, including
the main executable, so that we can get the right base address
mapping. */
if (!libbacktrace_using_fdpic ())
{
struct libbacktrace_base_address zero_base_address;
memset (&zero_base_address, 0, sizeof zero_base_address);
ret = elf_add (state, filename, descriptor, NULL, 0, zero_base_address,
NULL, error_callback, data, &elf_fileline_fn, &found_sym,
&found_dwarf, NULL, 1, 0, NULL, 0);
if (!ret)
return 0;
}
pd.state = state;
pd.error_callback = error_callback;