Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | Date | Thu, 26 May 2022 22:52:17 -0700 | Subject | [PATCH] perf: Fix segbase for ld.lld linked objects | From | Fangrui Song <> |
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segbase is the address of .eh_frame_hdr and table_data is segbase plus the header size. find_proc_info computes segbase as `map->start + segbase - map->pgoff` which is wrong when
* .eh_frame_hdr and .text are in different PT_LOAD program headers * and their p_vaddr difference does not equal their p_offset difference
Since 10.0, ld.lld's default --rosegment -z noseparate-code layout has such R and RX PT_LOAD program headers.
ld.lld => fail ld.lld --no-rosegment => ok ld.lld -z separate-code => ok
ld.bfd -z separate-code (default for Linux/x86) => ok ld.bfd -z noseparate-code => ok
To fix the issue, compute segbase as dso's base address plus PT_GNU_EH_FRAME's p_vaddr.
Reported-by: Sebastian Ullrich <sebasti@nullri.ch> Link: https://github.com/ClangBuiltLinux/linux/issues/1646 Signed-off-by: Fangrui Song <maskray@google.com> Cc: Ian Rogers <irogers@google.com> --- tools/perf/util/dso.h | 2 + tools/perf/util/unwind-libunwind-local.c | 96 ++++++++++++++++-------- 2 files changed, 67 insertions(+), 31 deletions(-)
diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h index 3a9fd4d389b5..ec4fc1a9454b 100644 --- a/tools/perf/util/dso.h +++ b/tools/perf/util/dso.h @@ -179,6 +179,7 @@ struct dso { bool loaded; u8 rel; struct build_id bid; + u64 base_addr; u64 text_offset; const char *short_name; const char *long_name; @@ -197,6 +198,7 @@ struct dso { u64 file_size; struct list_head open_entry; u64 debug_frame_offset; + u64 eh_frame_hdr_addr; u64 eh_frame_hdr_offset; } data; /* bpf prog information */ diff --git a/tools/perf/util/unwind-libunwind-local.c b/tools/perf/util/unwind-libunwind-local.c index 41e29fc7648a..7a0053954e49 100644 --- a/tools/perf/util/unwind-libunwind-local.c +++ b/tools/perf/util/unwind-libunwind-local.c @@ -169,30 +169,55 @@ static int __dw_read_encoded_value(u8 **p, u8 *end, u64 *val, __v; \ }) -static u64 elf_section_offset(int fd, const char *name) +static int elf_section_address_and_offset(int fd, const char *name, u64 *address, u64 *offset) { Elf *elf; GElf_Ehdr ehdr; GElf_Shdr shdr; - u64 offset = 0; + int ret; elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); if (elf == NULL) - return 0; + return -1; - do { - if (gelf_getehdr(elf, &ehdr) == NULL) - break; + if (gelf_getehdr(elf, &ehdr) == NULL) + goto out_err; - if (!elf_section_by_name(elf, &ehdr, &shdr, name, NULL)) - break; - - offset = shdr.sh_offset; - } while (0); + if (!elf_section_by_name(elf, &ehdr, &shdr, name, NULL)) + goto out_err; + *address = shdr.sh_addr; + *offset = shdr.sh_offset; + ret = 0; +out_err: elf_end(elf); + return ret; +} + +#ifndef NO_LIBUNWIND_DEBUG_FRAME +static u64 elf_section_offset(int fd, const char *name) +{ + u64 address, offset; + + if (elf_section_address_and_offset(fd, name, &address, &offset)) + return 0; + return offset; } +#endif + +static int elf_base_address(int fd) +{ + Elf *elf = elf_begin(fd, PERF_ELF_C_READ_MMAP, NULL); + GElf_Phdr phdr; + int retval = 0; + + if (gelf_getphdr(elf, 0, &phdr) != NULL) + retval = phdr.p_vaddr & -getpagesize(); + + elf_end(elf); + return retval; +} #ifndef NO_LIBUNWIND_DEBUG_FRAME static int elf_is_exec(int fd, const char *name) @@ -248,8 +273,7 @@ struct eh_frame_hdr { } __packed; static int unwind_spec_ehframe(struct dso *dso, struct machine *machine, - u64 offset, u64 *table_data, u64 *segbase, - u64 *fde_count) + u64 offset, u64 *table_data_offset, u64 *fde_count) { struct eh_frame_hdr hdr; u8 *enc = (u8 *) &hdr.enc; @@ -265,35 +289,45 @@ static int unwind_spec_ehframe(struct dso *dso, struct machine *machine, dw_read_encoded_value(enc, end, hdr.eh_frame_ptr_enc); *fde_count = dw_read_encoded_value(enc, end, hdr.fde_count_enc); - *segbase = offset; - *table_data = (enc - (u8 *) &hdr) + offset; + *table_data_offset = enc - (u8 *) &hdr; return 0; } -static int read_unwind_spec_eh_frame(struct dso *dso, struct machine *machine, +static int read_unwind_spec_eh_frame(struct dso *dso, struct unwind_info *ui, u64 *table_data, u64 *segbase, u64 *fde_count) { - int ret = -EINVAL, fd; - u64 offset = dso->data.eh_frame_hdr_offset; + struct map *map; + int ret, fd; - if (offset == 0) { - fd = dso__data_get_fd(dso, machine); + if (dso->data.eh_frame_hdr_offset == 0) { + u64 addr_min = UINT64_MAX; + + fd = dso__data_get_fd(dso, ui->machine); if (fd < 0) return -EINVAL; /* Check the .eh_frame section for unwinding info */ - offset = elf_section_offset(fd, ".eh_frame_hdr"); - dso->data.eh_frame_hdr_offset = offset; + ret = elf_section_address_and_offset(fd, ".eh_frame_hdr", + &dso->data.eh_frame_hdr_addr, + &dso->data.eh_frame_hdr_offset); + maps__for_each_entry(ui->thread->maps, map) { + if (map->dso == dso && map->start < addr_min) + addr_min = map->start; + } + dso->base_addr = addr_min - elf_base_address(fd); dso__data_put_fd(dso); + if (ret || dso->data.eh_frame_hdr_offset == 0) + return -EINVAL; } - if (offset) - ret = unwind_spec_ehframe(dso, machine, offset, - table_data, segbase, - fde_count); - - return ret; + *segbase = dso->base_addr + dso->data.eh_frame_hdr_addr; + ret = unwind_spec_ehframe(dso, ui->machine, dso->data.eh_frame_hdr_offset, + table_data, fde_count); + if (ret) + return ret; + *table_data += *segbase; + return 0; } #ifndef NO_LIBUNWIND_DEBUG_FRAME @@ -388,14 +422,14 @@ find_proc_info(unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pi, pr_debug("unwind: find_proc_info dso %s\n", map->dso->name); /* Check the .eh_frame section for unwinding info */ - if (!read_unwind_spec_eh_frame(map->dso, ui->machine, + if (!read_unwind_spec_eh_frame(map->dso, ui, &table_data, &segbase, &fde_count)) { memset(&di, 0, sizeof(di)); di.format = UNW_INFO_FORMAT_REMOTE_TABLE; di.start_ip = map->start; di.end_ip = map->end; - di.u.rti.segbase = map->start + segbase - map->pgoff; - di.u.rti.table_data = map->start + table_data - map->pgoff; + di.u.rti.segbase = segbase; + di.u.rti.table_data = table_data; di.u.rti.table_len = fde_count * sizeof(struct table_entry) / sizeof(unw_word_t); ret = dwarf_search_unwind_table(as, ip, &di, pi, -- 2.36.1.124.g0e6072fb45-goog
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