From 086f9f3d7897d8081b18b949caa631b937c5891e Mon Sep 17 00:00:00 2001 From: Stefano Sanfilippo Date: Thu, 13 Oct 2016 03:59:41 -0700 Subject: [PATCH] perf jit: Generate .eh_frame/.eh_frame_hdr in DSO When the jit_buf_desc contains unwinding information, it is emitted as eh_frame unwinding sections in the DSOs generated by perf inject. The unwinding information is required to unwind of JITed code which do not maintain the frame pointer register during function calls. It can be emitted by V8 / Chromium when the --perf_prof_unwinding_info is passed to V8. The eh_frame and eh_frame_hdr sections are emitted immediately after the .text. The .eh_frame is aligned at a 8-byte boundary, and .eh_frame_hdr at a 4-byte one. Since size of the .eh_frame is required to be a multiple of the word size, which means there will never be additional padding between it and the .eh_frame_hdr on machines where the word size is 4 or 8 bytes. However, additional padding might be inserted between .text and .eh_frame to reach the correct alignment, which will always be 8 bytes, also on 32bit machines. The reasoning behind this choice is that 4 extra bytes of padding worst case are not a large cost for the advantage of removing word-size dependent offset calculations when emitting the jitdump. Signed-off-by: Stefano Sanfilippo Signed-off-by: Ross McIlroy Reviewed-by: Stephane Eranian Cc: Anton Blanchard Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1476356383-30100-8-git-send-email-eranian@google.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/genelf.c | 102 ++++++++++++++++++++++++++++++++++++-- tools/perf/util/genelf.h | 3 +- tools/perf/util/jitdump.c | 11 ++-- 3 files changed, 109 insertions(+), 7 deletions(-) diff --git a/tools/perf/util/genelf.c b/tools/perf/util/genelf.c index 30dece345b9f..c540d47583e7 100644 --- a/tools/perf/util/genelf.c +++ b/tools/perf/util/genelf.c @@ -73,6 +73,8 @@ static char shd_string_table[] = { '.', 'd', 'e', 'b', 'u', 'g', '_', 'l', 'i', 'n', 'e', 0, /* 52 */ '.', 'd', 'e', 'b', 'u', 'g', '_', 'i', 'n', 'f', 'o', 0, /* 64 */ '.', 'd', 'e', 'b', 'u', 'g', '_', 'a', 'b', 'b', 'r', 'e', 'v', 0, /* 76 */ + '.', 'e', 'h', '_', 'f', 'r', 'a', 'm', 'e', '_', 'h', 'd', 'r', 0, /* 90 */ + '.', 'e', 'h', '_', 'f', 'r', 'a', 'm', 'e', 0, /* 104 */ }; static struct buildid_note { @@ -153,6 +155,86 @@ gen_build_id(struct buildid_note *note, unsigned long load_addr, const void *cod } #endif +static int +jit_add_eh_frame_info(Elf *e, void* unwinding, uint64_t unwinding_header_size, + uint64_t unwinding_size, uint64_t base_offset) +{ + Elf_Data *d; + Elf_Scn *scn; + Elf_Shdr *shdr; + uint64_t unwinding_table_size = unwinding_size - unwinding_header_size; + + /* + * setup eh_frame section + */ + scn = elf_newscn(e); + if (!scn) { + warnx("cannot create section"); + return -1; + } + + d = elf_newdata(scn); + if (!d) { + warnx("cannot get new data"); + return -1; + } + + d->d_align = 8; + d->d_off = 0LL; + d->d_buf = unwinding; + d->d_type = ELF_T_BYTE; + d->d_size = unwinding_table_size; + d->d_version = EV_CURRENT; + + shdr = elf_getshdr(scn); + if (!shdr) { + warnx("cannot get section header"); + return -1; + } + + shdr->sh_name = 104; + shdr->sh_type = SHT_PROGBITS; + shdr->sh_addr = base_offset; + shdr->sh_flags = SHF_ALLOC; + shdr->sh_entsize = 0; + + /* + * setup eh_frame_hdr section + */ + scn = elf_newscn(e); + if (!scn) { + warnx("cannot create section"); + return -1; + } + + d = elf_newdata(scn); + if (!d) { + warnx("cannot get new data"); + return -1; + } + + d->d_align = 4; + d->d_off = 0LL; + d->d_buf = unwinding + unwinding_table_size; + d->d_type = ELF_T_BYTE; + d->d_size = unwinding_header_size; + d->d_version = EV_CURRENT; + + shdr = elf_getshdr(scn); + if (!shdr) { + warnx("cannot get section header"); + return -1; + } + + shdr->sh_name = 90; + shdr->sh_type = SHT_PROGBITS; + shdr->sh_addr = base_offset + unwinding_table_size; + shdr->sh_flags = SHF_ALLOC; + shdr->sh_entsize = 0; + + return 0; +} + /* * fd: file descriptor open for writing for the output file * load_addr: code load address (could be zero, just used for buildid) @@ -163,13 +245,15 @@ gen_build_id(struct buildid_note *note, unsigned long load_addr, const void *cod int jit_write_elf(int fd, uint64_t load_addr, const char *sym, const void *code, int csize, - void *debug __maybe_unused, int nr_debug_entries __maybe_unused) + void *debug __maybe_unused, int nr_debug_entries __maybe_unused, + void *unwinding, uint64_t unwinding_header_size, uint64_t unwinding_size) { Elf *e; Elf_Data *d; Elf_Scn *scn; Elf_Ehdr *ehdr; Elf_Shdr *shdr; + uint64_t eh_frame_base_offset; char *strsym = NULL; int symlen; int retval = -1; @@ -200,7 +284,7 @@ jit_write_elf(int fd, uint64_t load_addr, const char *sym, ehdr->e_type = ET_DYN; ehdr->e_entry = GEN_ELF_TEXT_OFFSET; ehdr->e_version = EV_CURRENT; - ehdr->e_shstrndx= 2; /* shdr index for section name */ + ehdr->e_shstrndx= unwinding ? 4 : 2; /* shdr index for section name */ /* * setup text section @@ -236,6 +320,18 @@ jit_write_elf(int fd, uint64_t load_addr, const char *sym, shdr->sh_flags = SHF_EXECINSTR | SHF_ALLOC; shdr->sh_entsize = 0; + /* + * Setup .eh_frame_hdr and .eh_frame + */ + if (unwinding) { + eh_frame_base_offset = ALIGN_8(GEN_ELF_TEXT_OFFSET + csize); + retval = jit_add_eh_frame_info(e, unwinding, + unwinding_header_size, unwinding_size, + eh_frame_base_offset); + if (retval) + goto error; + } + /* * setup section headers string table */ @@ -304,7 +400,7 @@ jit_write_elf(int fd, uint64_t load_addr, const char *sym, shdr->sh_type = SHT_SYMTAB; shdr->sh_flags = 0; shdr->sh_entsize = sizeof(Elf_Sym); - shdr->sh_link = 4; /* index of .strtab section */ + shdr->sh_link = unwinding ? 6 : 4; /* index of .strtab section */ /* * setup symbols string table diff --git a/tools/perf/util/genelf.h b/tools/perf/util/genelf.h index 5c933ac71451..2424bd9862a3 100644 --- a/tools/perf/util/genelf.h +++ b/tools/perf/util/genelf.h @@ -3,7 +3,8 @@ /* genelf.c */ int jit_write_elf(int fd, uint64_t code_addr, const char *sym, - const void *code, int csize, void *debug, int nr_debug_entries); + const void *code, int csize, void *debug, int nr_debug_entries, + void *unwinding, uint64_t unwinding_header_size, uint64_t unwinding_size); #ifdef HAVE_DWARF_SUPPORT /* genelf_debug.c */ int jit_add_debug_info(Elf *e, uint64_t code_addr, void *debug, int nr_debug_entries); diff --git a/tools/perf/util/jitdump.c b/tools/perf/util/jitdump.c index 9bae66cc78f2..6a2688da3c4a 100644 --- a/tools/perf/util/jitdump.c +++ b/tools/perf/util/jitdump.c @@ -72,7 +72,10 @@ jit_emit_elf(char *filename, const void *code, int csize, void *debug, - int nr_debug_entries) + int nr_debug_entries, + void *unwinding, + uint32_t unwinding_header_size, + uint32_t unwinding_size) { int ret, fd; @@ -85,7 +88,8 @@ jit_emit_elf(char *filename, return -1; } - ret = jit_write_elf(fd, code_addr, sym, (const void *)code, csize, debug, nr_debug_entries); + ret = jit_write_elf(fd, code_addr, sym, (const void *)code, csize, debug, nr_debug_entries, + unwinding, unwinding_header_size, unwinding_size); close(fd); @@ -412,7 +416,8 @@ static int jit_repipe_code_load(struct jit_buf_desc *jd, union jr_entry *jr) size = PERF_ALIGN(size, sizeof(u64)); uaddr = (uintptr_t)code; - ret = jit_emit_elf(filename, sym, addr, (const void *)uaddr, csize, jd->debug_data, jd->nr_debug_entries); + ret = jit_emit_elf(filename, sym, addr, (const void *)uaddr, csize, jd->debug_data, jd->nr_debug_entries, + jd->unwinding_data, jd->eh_frame_hdr_size, jd->unwinding_size); if (jd->debug_data && jd->nr_debug_entries) { free(jd->debug_data); -- 2.20.1