v/thirdparty/libbacktrace/windows.c

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// pecoff.c:
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
typedef struct {
uint16_t machine;
uint16_t number_of_sections;
uint32_t time_date_stamp;
uint32_t pointer_to_symbol_table;
uint32_t number_of_symbols;
uint16_t size_of_optional_header;
uint16_t characteristics;
} b_coff_file_header;
typedef struct {
uint16_t magic;
uint8_t major_linker_version;
uint8_t minor_linker_version;
uint32_t size_of_code;
uint32_t size_of_initialized_data;
uint32_t size_of_uninitialized_data;
uint32_t address_of_entry_point;
uint32_t base_of_code;
union {
struct {
uint32_t base_of_data;
uint32_t image_base;
} pe;
struct {
uint64_t image_base;
} pep;
} u;
} b_coff_optional_header;
#define PE_MAGIC 0x10b
#define PEP_MAGIC 0x20b
typedef struct {
char name[8];
uint32_t virtual_size;
uint32_t virtual_address;
uint32_t size_of_raw_data;
uint32_t pointer_to_raw_data;
uint32_t pointer_to_relocations;
uint32_t pointer_to_line_numbers;
uint16_t number_of_relocations;
uint16_t number_of_line_numbers;
uint32_t characteristics;
} b_coff_section_header;
typedef union {
char short_name[8];
struct {
unsigned char zeroes[4];
unsigned char off[4];
} long_name;
} b_coff_name;
typedef struct {
b_coff_name name;
unsigned char value[4];
unsigned char section_number[2];
unsigned char type[2];
unsigned char storage_class;
unsigned char number_of_aux_symbols;
} b_coff_external_symbol;
#define N_TBSHFT 4
#define IMAGE_SYM_DTYPE_FUNCTION 2
#define SYM_SZ 18
typedef struct {
const char *name;
uint32_t value;
int16_t sec;
uint16_t type;
uint16_t sc;
} b_coff_internal_symbol;
static const char *const debug_section_names[DEBUG_MAX] = {
".debug_info", ".debug_line", ".debug_abbrev",
".debug_ranges", ".debug_str", ".debug_addr",
".debug_str_offsets", ".debug_line_str", ".debug_rnglists"};
struct debug_section_info {
off_t offset;
size_t size;
};
struct coff_symbol {
const char *name;
uintptr_t address;
};
struct coff_syminfo_data {
struct coff_syminfo_data *next;
struct coff_symbol *symbols;
size_t count;
};
static int coff_nodebug(struct backtrace_state *state ATTRIBUTE_UNUSED,
uintptr_t pc ATTRIBUTE_UNUSED,
backtrace_full_callback callback ATTRIBUTE_UNUSED,
backtrace_error_callback error_callback, void *data) {
error_callback(data, "no debug info in PE/COFF executable", -1);
return 0;
}
static void coff_nosyms(struct backtrace_state *state ATTRIBUTE_UNUSED,
uintptr_t addr ATTRIBUTE_UNUSED,
backtrace_syminfo_callback callback ATTRIBUTE_UNUSED,
backtrace_error_callback error_callback, void *data) {
error_callback(data, "no symbol table in PE/COFF executable", -1);
}
static uint32_t coff_read4(const unsigned char *p) {
uint32_t res;
memcpy(&res, p, 4);
return res;
}
static uint16_t coff_read2(const unsigned char *p) {
uint16_t res;
memcpy(&res, p, sizeof(res));
return res;
}
static size_t coff_short_name_len(const char *name) {
int i;
for (i = 0; i < 8; i++)
if (name[i] == 0) return i;
return 8;
}
static int coff_short_name_eq(const char *name, const char *cname) {
int i;
for (i = 0; i < 8; i++) {
if (name[i] != cname[i]) return 0;
if (name[i] == 0) return 1;
}
return name[8] == 0;
}
static int coff_long_name_eq(const char *name, unsigned int off,
struct backtrace_view *str_view) {
if (off >= str_view->len) return 0;
return strcmp(name, (const char *)str_view->data + off) == 0;
}
static int coff_symbol_compare(const void *v1, const void *v2) {
const struct coff_symbol *e1 = (const struct coff_symbol *)v1;
const struct coff_symbol *e2 = (const struct coff_symbol *)v2;
if (e1->address < e2->address)
return -1;
else if (e1->address > e2->address)
return 1;
else
return 0;
}
static int coff_expand_symbol(b_coff_internal_symbol *isym,
const b_coff_external_symbol *sym,
uint16_t sects_num, const unsigned char *strtab,
size_t strtab_size) {
isym->type = coff_read2(sym->type);
isym->sec = coff_read2(sym->section_number);
isym->sc = sym->storage_class;
if (isym->sec > 0 && (uint16_t)isym->sec > sects_num) return -1;
if (sym->name.short_name[0] != 0)
isym->name = sym->name.short_name;
else {
uint32_t off = coff_read4(sym->name.long_name.off);
if (off >= strtab_size) return -1;
isym->name = (const char *)strtab + off;
}
return 0;
}
static int coff_is_function_symbol(const b_coff_internal_symbol *isym) {
return (isym->type >> N_TBSHFT) == IMAGE_SYM_DTYPE_FUNCTION && isym->sec > 0;
}
static int coff_initialize_syminfo(
struct backtrace_state *state, uintptr_t base_address, int is_64,
const b_coff_section_header *sects, size_t sects_num,
const b_coff_external_symbol *syms, size_t syms_size,
const unsigned char *strtab, size_t strtab_size,
backtrace_error_callback error_callback, void *data,
struct coff_syminfo_data *sdata) {
size_t syms_count;
char *coff_symstr;
size_t coff_symstr_len;
size_t coff_symbol_count;
size_t coff_symbol_size;
struct coff_symbol *coff_symbols;
struct coff_symbol *coff_sym;
char *coff_str;
size_t i;
syms_count = syms_size / SYM_SZ;
coff_symbol_count = 0;
coff_symstr_len = 0;
for (i = 0; i < syms_count; ++i) {
const b_coff_external_symbol *asym = &syms[i];
b_coff_internal_symbol isym;
if (coff_expand_symbol(&isym, asym, sects_num, strtab, strtab_size) < 0) {
error_callback(data, "invalid section or offset in coff symbol", 0);
return 0;
}
if (coff_is_function_symbol(&isym)) {
++coff_symbol_count;
if (asym->name.short_name[0] != 0)
coff_symstr_len += coff_short_name_len(asym->name.short_name) + 1;
}
i += asym->number_of_aux_symbols;
}
coff_symbol_size = (coff_symbol_count + 1) * sizeof(struct coff_symbol);
coff_symbols = ((struct coff_symbol *)backtrace_alloc(state, coff_symbol_size,
error_callback, data));
if (coff_symbols == NULL) return 0;
if (coff_symstr_len > 0) {
coff_symstr =
((char *)backtrace_alloc(state, coff_symstr_len, error_callback, data));
if (coff_symstr == NULL) {
backtrace_free(state, coff_symbols, coff_symbol_size, error_callback,
data);
return 0;
}
} else
coff_symstr = NULL;
coff_sym = coff_symbols;
coff_str = coff_symstr;
for (i = 0; i < syms_count; ++i) {
const b_coff_external_symbol *asym = &syms[i];
b_coff_internal_symbol isym;
if (coff_expand_symbol(&isym, asym, sects_num, strtab, strtab_size)) {
abort();
}
if (coff_is_function_symbol(&isym)) {
const char *name;
int16_t secnum;
if (asym->name.short_name[0] != 0) {
size_t len = coff_short_name_len(isym.name);
name = coff_str;
memcpy(coff_str, isym.name, len);
coff_str[len] = 0;
coff_str += len + 1;
} else
name = isym.name;
if (!is_64) {
if (name[0] == '_') name++;
}
secnum = coff_read2(asym->section_number);
coff_sym->name = name;
coff_sym->address = (coff_read4(asym->value) +
sects[secnum - 1].virtual_address + base_address);
coff_sym++;
}
i += asym->number_of_aux_symbols;
}
coff_sym->name = NULL;
coff_sym->address = -1;
backtrace_qsort(coff_symbols, coff_symbol_count, sizeof(struct coff_symbol),
coff_symbol_compare);
sdata->next = NULL;
sdata->symbols = coff_symbols;
sdata->count = coff_symbol_count;
return 1;
}
static void coff_add_syminfo_data(struct backtrace_state *state,
struct coff_syminfo_data *sdata) {
if (!state->threaded) {
struct coff_syminfo_data **pp;
for (pp = (struct coff_syminfo_data **)(void *)&state->syminfo_data;
*pp != NULL; pp = &(*pp)->next)
;
*pp = sdata;
} else {
while (1) {
struct coff_syminfo_data **pp;
pp = (struct coff_syminfo_data **)(void *)&state->syminfo_data;
while (1) {
struct coff_syminfo_data *p;
p = backtrace_atomic_load_pointer(pp);
if (p == NULL) break;
pp = &p->next;
}
if (__sync_bool_compare_and_swap(pp, NULL, sdata)) break;
}
}
}
static int coff_symbol_search(const void *vkey, const void *ventry) {
const uintptr_t *key = (const uintptr_t *)vkey;
const struct coff_symbol *entry = (const struct coff_symbol *)ventry;
uintptr_t addr;
addr = *key;
if (addr < entry->address)
return -1;
else if (addr >= entry[1].address)
return 1;
else
return 0;
}
static void coff_syminfo(
struct backtrace_state *state, uintptr_t addr,
backtrace_syminfo_callback callback,
backtrace_error_callback error_callback ATTRIBUTE_UNUSED, void *data) {
struct coff_syminfo_data *sdata;
struct coff_symbol *sym = NULL;
if (!state->threaded) {
for (sdata = (struct coff_syminfo_data *)state->syminfo_data; sdata != NULL;
sdata = sdata->next) {
sym = ((struct coff_symbol *)bsearch(&addr, sdata->symbols, sdata->count,
sizeof(struct coff_symbol),
coff_symbol_search));
if (sym != NULL) break;
}
} else {
struct coff_syminfo_data **pp;
pp = (struct coff_syminfo_data **)(void *)&state->syminfo_data;
while (1) {
sdata = backtrace_atomic_load_pointer(pp);
if (sdata == NULL) break;
sym = ((struct coff_symbol *)bsearch(&addr, sdata->symbols, sdata->count,
sizeof(struct coff_symbol),
coff_symbol_search));
if (sym != NULL) break;
pp = &sdata->next;
}
}
if (sym == NULL)
callback(data, addr, NULL, 0, 0);
else
callback(data, addr, sym->name, sym->address, 0);
}
static int coff_add(struct backtrace_state *state, int descriptor,
backtrace_error_callback error_callback, void *data,
fileline *fileline_fn, int *found_sym, int *found_dwarf) {
struct backtrace_view fhdr_view;
off_t fhdr_off;
int magic_ok;
b_coff_file_header fhdr;
off_t opt_sects_off;
size_t opt_sects_size;
unsigned int sects_num;
struct backtrace_view sects_view;
int sects_view_valid;
const b_coff_optional_header *opt_hdr;
const b_coff_section_header *sects;
struct backtrace_view str_view;
int str_view_valid;
size_t str_size;
off_t str_off;
struct backtrace_view syms_view;
off_t syms_off;
size_t syms_size;
int syms_view_valid;
unsigned int syms_num;
unsigned int i;
struct debug_section_info sections[DEBUG_MAX];
off_t min_offset;
off_t max_offset;
struct backtrace_view debug_view;
int debug_view_valid;
int is_64;
uintptr_t image_base;
struct dwarf_sections dwarf_sections;
*found_sym = 0;
*found_dwarf = 0;
sects_view_valid = 0;
syms_view_valid = 0;
str_view_valid = 0;
debug_view_valid = 0;
if (!backtrace_get_view(state, descriptor, 0, 0x40, error_callback, data,
&fhdr_view))
goto fail;
{
const unsigned char *vptr = fhdr_view.data;
if (vptr[0] == 'M' && vptr[1] == 'Z')
fhdr_off = coff_read4(vptr + 0x3c);
else
fhdr_off = 0;
}
backtrace_release_view(state, &fhdr_view, error_callback, data);
if (!backtrace_get_view(state, descriptor, fhdr_off,
sizeof(b_coff_file_header) + 4, error_callback, data,
&fhdr_view))
goto fail;
if (fhdr_off != 0) {
const char *magic = (const char *)fhdr_view.data;
magic_ok = memcmp(magic, "PE\0", 4) == 0;
fhdr_off += 4;
memcpy(&fhdr, fhdr_view.data + 4, sizeof fhdr);
} else {
memcpy(&fhdr, fhdr_view.data, sizeof fhdr);
magic_ok = 0;
}
backtrace_release_view(state, &fhdr_view, error_callback, data);
if (!magic_ok) {
error_callback(data, "executable file is not COFF", 0);
goto fail;
}
sects_num = fhdr.number_of_sections;
syms_num = fhdr.number_of_symbols;
opt_sects_off = fhdr_off + sizeof(fhdr);
opt_sects_size = (fhdr.size_of_optional_header +
sects_num * sizeof(b_coff_section_header));
if (!backtrace_get_view(state, descriptor, opt_sects_off, opt_sects_size,
error_callback, data, &sects_view))
goto fail;
sects_view_valid = 1;
opt_hdr = (const b_coff_optional_header *)sects_view.data;
sects = (const b_coff_section_header *)(sects_view.data +
fhdr.size_of_optional_header);
is_64 = 0;
if (fhdr.size_of_optional_header > sizeof(*opt_hdr)) {
if (opt_hdr->magic == PE_MAGIC)
image_base = opt_hdr->u.pe.image_base;
else if (opt_hdr->magic == PEP_MAGIC) {
image_base = opt_hdr->u.pep.image_base;
is_64 = 1;
} else {
error_callback(data, "bad magic in PE optional header", 0);
goto fail;
}
} else
image_base = 0;
if (fhdr.pointer_to_symbol_table == 0) {
str_off = 0;
str_size = 0;
syms_num = 0;
syms_size = 0;
} else {
syms_off = fhdr.pointer_to_symbol_table;
syms_size = syms_num * SYM_SZ;
if (!backtrace_get_view(state, descriptor, syms_off, syms_size + 4,
error_callback, data, &syms_view))
goto fail;
syms_view_valid = 1;
str_size = coff_read4(syms_view.data + syms_size);
str_off = syms_off + syms_size;
if (str_size > 4) {
if (!backtrace_get_view(state, descriptor, str_off, str_size,
error_callback, data, &str_view))
goto fail;
str_view_valid = 1;
}
}
memset(sections, 0, sizeof sections);
for (i = 0; i < sects_num; ++i) {
const b_coff_section_header *s = sects + i;
unsigned int str_off;
int j;
if (s->name[0] == '/') {
str_off = atoi(s->name + 1);
} else
str_off = 0;
for (j = 0; j < (int)DEBUG_MAX; ++j) {
const char *dbg_name = debug_section_names[j];
int match;
if (str_off != 0)
match = coff_long_name_eq(dbg_name, str_off, &str_view);
else
match = coff_short_name_eq(dbg_name, s->name);
if (match) {
sections[j].offset = s->pointer_to_raw_data;
sections[j].size = s->virtual_size <= s->size_of_raw_data
? s->virtual_size
: s->size_of_raw_data;
break;
}
}
}
if (syms_num != 0) {
struct coff_syminfo_data *sdata;
sdata = ((struct coff_syminfo_data *)backtrace_alloc(state, sizeof *sdata,
error_callback, data));
if (sdata == NULL) goto fail;
if (!coff_initialize_syminfo(state, image_base, is_64, sects, sects_num,
syms_view.data, syms_size, str_view.data,
str_size, error_callback, data, sdata)) {
backtrace_free(state, sdata, sizeof *sdata, error_callback, data);
goto fail;
}
*found_sym = 1;
coff_add_syminfo_data(state, sdata);
}
backtrace_release_view(state, &sects_view, error_callback, data);
sects_view_valid = 0;
if (syms_view_valid) {
backtrace_release_view(state, &syms_view, error_callback, data);
syms_view_valid = 0;
}
min_offset = 0;
max_offset = 0;
for (i = 0; i < (int)DEBUG_MAX; ++i) {
off_t end;
if (sections[i].size == 0) continue;
if (min_offset == 0 || sections[i].offset < min_offset)
min_offset = sections[i].offset;
end = sections[i].offset + sections[i].size;
if (end > max_offset) max_offset = end;
}
if (min_offset == 0 || max_offset == 0) {
if (!backtrace_close(descriptor, error_callback, data)) goto fail;
*fileline_fn = coff_nodebug;
return 1;
}
if (!backtrace_get_view(state, descriptor, min_offset,
max_offset - min_offset, error_callback, data,
&debug_view))
goto fail;
debug_view_valid = 1;
if (!backtrace_close(descriptor, error_callback, data)) goto fail;
descriptor = -1;
for (i = 0; i < (int)DEBUG_MAX; ++i) {
size_t size = sections[i].size;
dwarf_sections.size[i] = size;
if (size == 0)
dwarf_sections.data[i] = NULL;
else
dwarf_sections.data[i] = ((const unsigned char *)debug_view.data +
(sections[i].offset - min_offset));
}
if (!backtrace_dwarf_add(state, 0, &dwarf_sections, 0, NULL, error_callback,
data, fileline_fn, NULL))
goto fail;
*found_dwarf = 1;
return 1;
fail:
if (sects_view_valid)
backtrace_release_view(state, &sects_view, error_callback, data);
if (str_view_valid)
backtrace_release_view(state, &str_view, error_callback, data);
if (syms_view_valid)
backtrace_release_view(state, &syms_view, error_callback, data);
if (debug_view_valid)
backtrace_release_view(state, &debug_view, error_callback, data);
if (descriptor != -1) backtrace_close(descriptor, error_callback, data);
return 0;
}
int backtrace_initialize(struct backtrace_state *state,
const char *filename ATTRIBUTE_UNUSED, int descriptor,
backtrace_error_callback error_callback, void *data,
fileline *fileline_fn) {
int ret;
int found_sym;
int found_dwarf;
fileline coff_fileline_fn;
ret = coff_add(state, descriptor, error_callback, data, &coff_fileline_fn,
&found_sym, &found_dwarf);
if (!ret) return 0;
if (!state->threaded) {
if (found_sym)
state->syminfo_fn = coff_syminfo;
else if (state->syminfo_fn == NULL)
state->syminfo_fn = coff_nosyms;
} else {
if (found_sym)
backtrace_atomic_store_pointer(&state->syminfo_fn, coff_syminfo);
else
(void)__sync_bool_compare_and_swap(&state->syminfo_fn, NULL, coff_nosyms);
}
if (!state->threaded) {
if (state->fileline_fn == NULL || state->fileline_fn == coff_nodebug)
*fileline_fn = coff_fileline_fn;
} else {
fileline current_fn;
current_fn = backtrace_atomic_load_pointer(&state->fileline_fn);
if (current_fn == NULL || current_fn == coff_nodebug)
*fileline_fn = coff_fileline_fn;
}
return 1;
}
// read.c:
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
int backtrace_get_view(struct backtrace_state *state, int descriptor,
off_t offset, uint64_t size,
backtrace_error_callback error_callback, void *data,
struct backtrace_view *view) {
uint64_t got;
ssize_t r;
if ((uint64_t)(size_t)size != size) {
error_callback(data, "file size too large", 0);
return 0;
}
if (lseek(descriptor, offset, SEEK_SET) < 0) {
error_callback(data, "lseek", errno);
return 0;
}
view->base = backtrace_alloc(state, size, error_callback, data);
if (view->base == NULL) return 0;
view->data = view->base;
view->len = size;
got = 0;
while (got < size) {
r = read(descriptor, view->base, size - got);
if (r < 0) {
error_callback(data, "read", errno);
free(view->base);
return 0;
}
if (r == 0) break;
got += (uint64_t)r;
}
if (got < size) {
error_callback(data, "file too short", 0);
free(view->base);
return 0;
}
return 1;
}
void backtrace_release_view(struct backtrace_state *state,
struct backtrace_view *view,
backtrace_error_callback error_callback,
void *data) {
backtrace_free(state, view->base, view->len, error_callback, data);
view->data = NULL;
view->base = NULL;
}
// alloc.c:
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
void *backtrace_alloc(struct backtrace_state *state ATTRIBUTE_UNUSED,
size_t size, backtrace_error_callback error_callback,
void *data) {
void *ret;
ret = malloc(size);
if (ret == NULL) {
if (error_callback) error_callback(data, "malloc", errno);
}
return ret;
}
void backtrace_free(struct backtrace_state *state ATTRIBUTE_UNUSED, void *p,
size_t size ATTRIBUTE_UNUSED,
backtrace_error_callback error_callback ATTRIBUTE_UNUSED,
void *data ATTRIBUTE_UNUSED) {
free(p);
}
void *backtrace_vector_grow(struct backtrace_state *state ATTRIBUTE_UNUSED,
size_t size,
backtrace_error_callback error_callback, void *data,
struct backtrace_vector *vec) {
void *ret;
if (size > vec->alc) {
size_t alc;
void *base;
if (vec->size == 0)
alc = 32 * size;
else if (vec->size >= 4096)
alc = vec->size + 4096;
else
alc = 2 * vec->size;
if (alc < vec->size + size) alc = vec->size + size;
base = realloc(vec->base, alc);
if (base == NULL) {
error_callback(data, "realloc", errno);
return NULL;
}
vec->base = base;
vec->alc = alc - vec->size;
}
ret = (char *)vec->base + vec->size;
vec->size += size;
vec->alc -= size;
return ret;
}
void *backtrace_vector_finish(struct backtrace_state *state,
struct backtrace_vector *vec,
backtrace_error_callback error_callback,
void *data) {
void *ret;
if (!backtrace_vector_release(state, vec, error_callback, data)) return NULL;
ret = vec->base;
vec->base = NULL;
vec->size = 0;
vec->alc = 0;
return ret;
}
int backtrace_vector_release(struct backtrace_state *state ATTRIBUTE_UNUSED,
struct backtrace_vector *vec,
backtrace_error_callback error_callback,
void *data) {
vec->alc = 0;
if (vec->size == 0) {
free(vec->base);
vec->base = NULL;
return 1;
}
vec->base = realloc(vec->base, vec->size);
if (vec->base == NULL) {
error_callback(data, "realloc", errno);
return 0;
}
return 1;
}