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libbacktrace: support FDPIC (1dd5c40)

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Bartosz Taudul 2024-08-24 18:15:52 +02:00
parent 0d0e56dca3
commit e26c34346b
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GPG Key ID: B7FE2008B7575DF3
4 changed files with 108 additions and 48 deletions
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63
public/libbacktrace/dwarf.cpp
View File

@ -725,8 +725,8 @@ struct dwarf_data
struct dwarf_data *next; struct dwarf_data *next;
/* The data for .gnu_debugaltlink. */ /* The data for .gnu_debugaltlink. */
struct dwarf_data *altlink; struct dwarf_data *altlink;
/* The base address for this file. */ /* The base address mapping for this file. */
uintptr_t base_address; struct libbacktrace_base_address base_address;
/* A sorted list of address ranges. */ /* A sorted list of address ranges. */
struct unit_addrs *addrs; struct unit_addrs *addrs;
/* Number of address ranges in list. */ /* Number of address ranges in list. */
@ -1947,8 +1947,9 @@ update_pcrange (const struct attr* attr, const struct attr_val* val,
static int static int
add_low_high_range (struct backtrace_state *state, add_low_high_range (struct backtrace_state *state,
const struct dwarf_sections *dwarf_sections, const struct dwarf_sections *dwarf_sections,
uintptr_t base_address, int is_bigendian, struct libbacktrace_base_address base_address,
struct unit *u, const struct pcrange *pcrange, int is_bigendian, struct unit *u,
const struct pcrange *pcrange,
int (*add_range) (struct backtrace_state *state, int (*add_range) (struct backtrace_state *state,
void *rdata, uintptr_t lowpc, void *rdata, uintptr_t lowpc,
uintptr_t highpc, uintptr_t highpc,
@ -1983,8 +1984,8 @@ add_low_high_range (struct backtrace_state *state,
/* Add in the base address of the module when recording PC values, /* Add in the base address of the module when recording PC values,
so that we can look up the PC directly. */ so that we can look up the PC directly. */
lowpc += base_address; lowpc = libbacktrace_add_base (lowpc, base_address);
highpc += base_address; highpc = libbacktrace_add_base (highpc, base_address);
return add_range (state, rdata, lowpc, highpc, error_callback, data, vec); return add_range (state, rdata, lowpc, highpc, error_callback, data, vec);
} }
@ -1996,7 +1997,7 @@ static int
add_ranges_from_ranges ( add_ranges_from_ranges (
struct backtrace_state *state, struct backtrace_state *state,
const struct dwarf_sections *dwarf_sections, const struct dwarf_sections *dwarf_sections,
uintptr_t base_address, int is_bigendian, struct libbacktrace_base_address base_address, int is_bigendian,
struct unit *u, uintptr_t base, struct unit *u, uintptr_t base,
const struct pcrange *pcrange, const struct pcrange *pcrange,
int (*add_range) (struct backtrace_state *state, void *rdata, int (*add_range) (struct backtrace_state *state, void *rdata,
@ -2042,10 +2043,11 @@ add_ranges_from_ranges (
base = (uintptr_t) high; base = (uintptr_t) high;
else else
{ {
if (!add_range (state, rdata, uintptr_t rl, rh;
(uintptr_t) low + base + base_address,
(uintptr_t) high + base + base_address, rl = libbacktrace_add_base ((uintptr_t) low + base, base_address);
error_callback, data, vec)) rh = libbacktrace_add_base ((uintptr_t) high + base, base_address);
if (!add_range (state, rdata, rl, rh, error_callback, data, vec))
return 0; return 0;
} }
} }
@ -2063,7 +2065,7 @@ static int
add_ranges_from_rnglists ( add_ranges_from_rnglists (
struct backtrace_state *state, struct backtrace_state *state,
const struct dwarf_sections *dwarf_sections, const struct dwarf_sections *dwarf_sections,
uintptr_t base_address, int is_bigendian, struct libbacktrace_base_address base_address, int is_bigendian,
struct unit *u, uintptr_t base, struct unit *u, uintptr_t base,
const struct pcrange *pcrange, const struct pcrange *pcrange,
int (*add_range) (struct backtrace_state *state, void *rdata, int (*add_range) (struct backtrace_state *state, void *rdata,
@ -2146,9 +2148,10 @@ add_ranges_from_rnglists (
u->addrsize, is_bigendian, index, u->addrsize, is_bigendian, index,
error_callback, data, &high)) error_callback, data, &high))
return 0; return 0;
if (!add_range (state, rdata, low + base_address, if (!add_range (state, rdata,
high + base_address, error_callback, data, libbacktrace_add_base (low, base_address),
vec)) libbacktrace_add_base (high, base_address),
error_callback, data, vec))
return 0; return 0;
} }
break; break;
@ -2165,7 +2168,7 @@ add_ranges_from_rnglists (
error_callback, data, &low)) error_callback, data, &low))
return 0; return 0;
length = read_uleb128 (&rnglists_buf); length = read_uleb128 (&rnglists_buf);
low += base_address; low = libbacktrace_add_base (low, base_address);
if (!add_range (state, rdata, low, low + length, if (!add_range (state, rdata, low, low + length,
error_callback, data, vec)) error_callback, data, vec))
return 0; return 0;
@ -2179,8 +2182,9 @@ add_ranges_from_rnglists (
low = read_uleb128 (&rnglists_buf); low = read_uleb128 (&rnglists_buf);
high = read_uleb128 (&rnglists_buf); high = read_uleb128 (&rnglists_buf);
if (!add_range (state, rdata, low + base + base_address, if (!add_range (state, rdata,
high + base + base_address, libbacktrace_add_base (low + base, base_address),
libbacktrace_add_base (high + base, base_address),
error_callback, data, vec)) error_callback, data, vec))
return 0; return 0;
} }
@ -2197,9 +2201,10 @@ add_ranges_from_rnglists (
low = (uintptr_t) read_address (&rnglists_buf, u->addrsize); low = (uintptr_t) read_address (&rnglists_buf, u->addrsize);
high = (uintptr_t) read_address (&rnglists_buf, u->addrsize); high = (uintptr_t) read_address (&rnglists_buf, u->addrsize);
if (!add_range (state, rdata, low + base_address, if (!add_range (state, rdata,
high + base_address, error_callback, data, libbacktrace_add_base (low, base_address),
vec)) libbacktrace_add_base (high, base_address),
error_callback, data, vec))
return 0; return 0;
} }
break; break;
@ -2211,7 +2216,7 @@ add_ranges_from_rnglists (
low = (uintptr_t) read_address (&rnglists_buf, u->addrsize); low = (uintptr_t) read_address (&rnglists_buf, u->addrsize);
length = (uintptr_t) read_uleb128 (&rnglists_buf); length = (uintptr_t) read_uleb128 (&rnglists_buf);
low += base_address; low = libbacktrace_add_base (low, base_address);
if (!add_range (state, rdata, low, low + length, if (!add_range (state, rdata, low, low + length,
error_callback, data, vec)) error_callback, data, vec))
return 0; return 0;
@ -2239,7 +2244,7 @@ add_ranges_from_rnglists (
static int static int
add_ranges (struct backtrace_state *state, add_ranges (struct backtrace_state *state,
const struct dwarf_sections *dwarf_sections, const struct dwarf_sections *dwarf_sections,
uintptr_t base_address, int is_bigendian, struct libbacktrace_base_address base_address, int is_bigendian,
struct unit *u, uintptr_t base, const struct pcrange *pcrange, struct unit *u, uintptr_t base, const struct pcrange *pcrange,
int (*add_range) (struct backtrace_state *state, void *rdata, int (*add_range) (struct backtrace_state *state, void *rdata,
uintptr_t lowpc, uintptr_t highpc, uintptr_t lowpc, uintptr_t highpc,
@ -2275,7 +2280,8 @@ add_ranges (struct backtrace_state *state,
read, 0 if there is some error. */ read, 0 if there is some error. */
static int static int
find_address_ranges (struct backtrace_state *state, uintptr_t base_address, find_address_ranges (struct backtrace_state *state,
struct libbacktrace_base_address base_address,
struct dwarf_buf *unit_buf, struct dwarf_buf *unit_buf,
const struct dwarf_sections *dwarf_sections, const struct dwarf_sections *dwarf_sections,
int is_bigendian, struct dwarf_data *altlink, int is_bigendian, struct dwarf_data *altlink,
@ -2430,7 +2436,8 @@ find_address_ranges (struct backtrace_state *state, uintptr_t base_address,
on success, 0 on failure. */ on success, 0 on failure. */
static int static int
build_address_map (struct backtrace_state *state, uintptr_t base_address, build_address_map (struct backtrace_state *state,
struct libbacktrace_base_address base_address,
const struct dwarf_sections *dwarf_sections, const struct dwarf_sections *dwarf_sections,
int is_bigendian, struct dwarf_data *altlink, int is_bigendian, struct dwarf_data *altlink,
backtrace_error_callback error_callback, void *data, backtrace_error_callback error_callback, void *data,
@ -2649,7 +2656,7 @@ add_line (struct backtrace_state *state, struct dwarf_data *ddata,
/* Add in the base address here, so that we can look up the PC /* Add in the base address here, so that we can look up the PC
directly. */ directly. */
ln->pc = pc + ddata->base_address; ln->pc = libbacktrace_add_base (pc, ddata->base_address);
ln->filename = filename; ln->filename = filename;
ln->lineno = lineno; ln->lineno = lineno;
@ -4329,7 +4336,7 @@ dwarf_fileline (struct backtrace_state *state, uintptr_t pc,
static struct dwarf_data * static struct dwarf_data *
build_dwarf_data (struct backtrace_state *state, build_dwarf_data (struct backtrace_state *state,
uintptr_t base_address, struct libbacktrace_base_address base_address,
const struct dwarf_sections *dwarf_sections, const struct dwarf_sections *dwarf_sections,
int is_bigendian, int is_bigendian,
struct dwarf_data *altlink, struct dwarf_data *altlink,
@ -4387,7 +4394,7 @@ build_dwarf_data (struct backtrace_state *state,
int int
backtrace_dwarf_add (struct backtrace_state *state, backtrace_dwarf_add (struct backtrace_state *state,
uintptr_t base_address, struct libbacktrace_base_address base_address,
const struct dwarf_sections *dwarf_sections, const struct dwarf_sections *dwarf_sections,
int is_bigendian, int is_bigendian,
struct dwarf_data *fileline_altlink, struct dwarf_data *fileline_altlink,

32
public/libbacktrace/elf.cpp
View File

@ -643,7 +643,7 @@ elf_symbol_search (const void *vkey, const void *ventry)
static int static int
elf_initialize_syminfo (struct backtrace_state *state, 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 *symtab_data, size_t symtab_size,
const unsigned char *strtab, size_t strtab_size, const unsigned char *strtab, size_t strtab_size,
backtrace_error_callback error_callback, 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)); = *(const b_elf_addr *) (opd->data + (sym->st_value - opd->addr));
else else
elf_symbols[j].address = sym->st_value; 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; elf_symbols[j].size = sym->st_size;
++j; ++j;
} }
@ -6517,7 +6518,8 @@ backtrace_uncompress_lzma (struct backtrace_state *state,
static int static int
elf_add (struct backtrace_state *state, const char *filename, int descriptor, elf_add (struct backtrace_state *state, const char *filename, int descriptor,
const unsigned char *memory, size_t memory_size, 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, backtrace_error_callback error_callback, void *data,
fileline *fileline_fn, int *found_sym, int *found_dwarf, fileline *fileline_fn, int *found_sym, int *found_dwarf,
struct dwarf_data **fileline_entry, int exe, int debuginfo, struct dwarf_data **fileline_entry, int exe, int debuginfo,
@ -7419,6 +7421,7 @@ phdr_callback (struct PhdrIterate *info, void *pdata)
const char *filename; const char *filename;
int descriptor; int descriptor;
int does_not_exist; int does_not_exist;
struct libbacktrace_base_address base_address;
fileline elf_fileline_fn; fileline elf_fileline_fn;
int found_dwarf; int found_dwarf;
@ -7448,7 +7451,8 @@ phdr_callback (struct PhdrIterate *info, void *pdata)
return 0; 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, pd->error_callback, pd->data, &elf_fileline_fn, pd->found_sym,
&found_dwarf, NULL, 0, 0, NULL, 0)) &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; fileline elf_fileline_fn = elf_nodebug;
struct phdr_data pd; 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, /* When using fdpic we must use dl_iterate_phdr for all modules, including
NULL, 0); the main executable, so that we can get the right base address
if (!ret) mapping. */
return 0; 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.state = state;
pd.error_callback = error_callback; pd.error_callback = error_callback;

36
public/libbacktrace/internal.hpp
View File

@ -333,10 +333,44 @@ struct dwarf_sections
struct dwarf_data; struct dwarf_data;
/* The load address mapping. */
#if defined(__FDPIC__) && defined(HAVE_DL_ITERATE_PHDR) && (defined(HAVE_LINK_H) || defined(HAVE_SYS_LINK_H))
#ifdef HAVE_LINK_H
#include <link.h>
#endif
#ifdef HAVE_SYS_LINK_H
#include <sys/link.h>
#endif
#define libbacktrace_using_fdpic() (1)
struct libbacktrace_base_address
{
struct elf32_fdpic_loadaddr m;
};
#define libbacktrace_add_base(pc, base) \
((uintptr_t) (__RELOC_POINTER ((pc), (base).m)))
#else /* not _FDPIC__ */
#define libbacktrace_using_fdpic() (0)
struct libbacktrace_base_address
{
uintptr_t m;
};
#define libbacktrace_add_base(pc, base) ((pc) + (base).m)
#endif /* not _FDPIC__ */
/* Add file/line information for a DWARF module. */ /* Add file/line information for a DWARF module. */
extern int backtrace_dwarf_add (struct backtrace_state *state, extern int backtrace_dwarf_add (struct backtrace_state *state,
uintptr_t base_address, struct libbacktrace_base_address base_address,
const struct dwarf_sections *dwarf_sections, const struct dwarf_sections *dwarf_sections,
int is_bigendian, int is_bigendian,
struct dwarf_data *fileline_altlink, struct dwarf_data *fileline_altlink,

25
public/libbacktrace/macho.cpp
View File

@ -318,8 +318,9 @@ static const char * const dwarf_section_names[DEBUG_MAX] =
/* Forward declaration. */ /* Forward declaration. */
static int macho_add (struct backtrace_state *, const char *, int, off_t, static int macho_add (struct backtrace_state *, const char *, int, off_t,
const unsigned char *, uintptr_t, int, const unsigned char *, struct libbacktrace_base_address,
backtrace_error_callback, void *, fileline *, int *); int, backtrace_error_callback, void *, fileline *,
int *);
/* A dummy callback function used when we can't find any debug info. */ /* A dummy callback function used when we can't find any debug info. */
@ -514,7 +515,7 @@ macho_defined_symbol (uint8_t type)
static int static int
macho_add_symtab (struct backtrace_state *state, int descriptor, macho_add_symtab (struct backtrace_state *state, int descriptor,
uintptr_t base_address, int is_64, struct libbacktrace_base_address base_address, int is_64,
off_t symoff, unsigned int nsyms, off_t stroff, off_t symoff, unsigned int nsyms, off_t stroff,
unsigned int strsize, unsigned int strsize,
backtrace_error_callback error_callback, void *data) backtrace_error_callback error_callback, void *data)
@ -629,7 +630,7 @@ macho_add_symtab (struct backtrace_state *state, int descriptor,
if (name[0] == '_') if (name[0] == '_')
++name; ++name;
macho_symbols[j].name = name; macho_symbols[j].name = name;
macho_symbols[j].address = value + base_address; macho_symbols[j].address = libbacktrace_add_base (value, base_address);
++j; ++j;
} }
@ -762,7 +763,8 @@ macho_syminfo (struct backtrace_state *state, uintptr_t addr,
static int static int
macho_add_fat (struct backtrace_state *state, const char *filename, macho_add_fat (struct backtrace_state *state, const char *filename,
int descriptor, int swapped, off_t offset, int descriptor, int swapped, off_t offset,
const unsigned char *match_uuid, uintptr_t base_address, const unsigned char *match_uuid,
struct libbacktrace_base_address base_address,
int skip_symtab, uint32_t nfat_arch, int is_64, int skip_symtab, uint32_t nfat_arch, int is_64,
backtrace_error_callback error_callback, void *data, backtrace_error_callback error_callback, void *data,
fileline *fileline_fn, int *found_sym) fileline *fileline_fn, int *found_sym)
@ -864,7 +866,8 @@ macho_add_fat (struct backtrace_state *state, const char *filename,
static int static int
macho_add_dsym (struct backtrace_state *state, const char *filename, macho_add_dsym (struct backtrace_state *state, const char *filename,
uintptr_t base_address, const unsigned char *uuid, struct libbacktrace_base_address base_address,
const unsigned char *uuid,
backtrace_error_callback error_callback, void *data, backtrace_error_callback error_callback, void *data,
fileline* fileline_fn) fileline* fileline_fn)
{ {
@ -982,7 +985,7 @@ macho_add_dsym (struct backtrace_state *state, const char *filename,
static int static int
macho_add (struct backtrace_state *state, const char *filename, int descriptor, macho_add (struct backtrace_state *state, const char *filename, int descriptor,
off_t offset, const unsigned char *match_uuid, off_t offset, const unsigned char *match_uuid,
uintptr_t base_address, int skip_symtab, struct libbacktrace_base_address base_address, int skip_symtab,
backtrace_error_callback error_callback, void *data, backtrace_error_callback error_callback, void *data,
fileline *fileline_fn, int *found_sym) fileline *fileline_fn, int *found_sym)
{ {
@ -1244,7 +1247,7 @@ backtrace_initialize (struct backtrace_state *state, const char *filename,
c = _dyld_image_count (); c = _dyld_image_count ();
for (i = 0; i < c; ++i) for (i = 0; i < c; ++i)
{ {
uintptr_t base_address; struct libbacktrace_base_address base_address;
const char *name; const char *name;
int d; int d;
fileline mff; fileline mff;
@ -1268,7 +1271,7 @@ backtrace_initialize (struct backtrace_state *state, const char *filename,
continue; continue;
} }
base_address = _dyld_get_image_vmaddr_slide (i); base_address.m = _dyld_get_image_vmaddr_slide (i);
mff = macho_nodebug; mff = macho_nodebug;
if (!macho_add (state, name, d, 0, NULL, base_address, 0, if (!macho_add (state, name, d, 0, NULL, base_address, 0,
@ -1323,10 +1326,12 @@ backtrace_initialize (struct backtrace_state *state, const char *filename,
void *data, fileline *fileline_fn) void *data, fileline *fileline_fn)
{ {
fileline macho_fileline_fn; fileline macho_fileline_fn;
struct libbacktrace_base_address zero_base_address;
int found_sym; int found_sym;
macho_fileline_fn = macho_nodebug; macho_fileline_fn = macho_nodebug;
if (!macho_add (state, filename, descriptor, 0, NULL, 0, 0, memset (&zero_base_address, 0, sizeof zero_base_address);
if (!macho_add (state, filename, descriptor, 0, NULL, zero_base_address, 0,
error_callback, data, &macho_fileline_fn, &found_sym)) error_callback, data, &macho_fileline_fn, &found_sym))
return 0; return 0;