From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- tools/perf/util/genelf.c | 471 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 471 insertions(+) create mode 100644 tools/perf/util/genelf.c (limited to 'tools/perf/util/genelf.c') diff --git a/tools/perf/util/genelf.c b/tools/perf/util/genelf.c new file mode 100644 index 000000000..14882def9 --- /dev/null +++ b/tools/perf/util/genelf.c @@ -0,0 +1,471 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * genelf.c + * Copyright (C) 2014, Google, Inc + * + * Contributed by: + * Stephane Eranian + */ + +#include +#include +#include +#include +#include +#include +#include +#ifdef HAVE_LIBDW_SUPPORT +#include +#endif + +#include "blake2s.h" +#include "genelf.h" +#include "../util/jitdump.h" +#include + +#ifndef NT_GNU_BUILD_ID +#define NT_GNU_BUILD_ID 3 +#endif + +typedef struct { + unsigned int namesz; /* Size of entry's owner string */ + unsigned int descsz; /* Size of the note descriptor */ + unsigned int type; /* Interpretation of the descriptor */ + char name[0]; /* Start of the name+desc data */ +} Elf_Note; + +static char shd_string_table[] = { + 0, + '.', 't', 'e', 'x', 't', 0, /* 1 */ + '.', 's', 'h', 's', 't', 'r', 't', 'a', 'b', 0, /* 7 */ + '.', 's', 'y', 'm', 't', 'a', 'b', 0, /* 17 */ + '.', 's', 't', 'r', 't', 'a', 'b', 0, /* 25 */ + '.', 'n', 'o', 't', 'e', '.', 'g', 'n', 'u', '.', 'b', 'u', 'i', 'l', 'd', '-', 'i', 'd', 0, /* 33 */ + '.', '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 { + Elf_Note desc; /* descsz: size of build-id, must be multiple of 4 */ + char name[4]; /* GNU\0 */ + u8 build_id[20]; +} bnote; + +static Elf_Sym symtab[]={ + /* symbol 0 MUST be the undefined symbol */ + { .st_name = 0, /* index in sym_string table */ + .st_info = ELF_ST_TYPE(STT_NOTYPE), + .st_shndx = 0, /* for now */ + .st_value = 0x0, + .st_other = ELF_ST_VIS(STV_DEFAULT), + .st_size = 0, + }, + { .st_name = 1, /* index in sym_string table */ + .st_info = ELF_ST_BIND(STB_LOCAL) | ELF_ST_TYPE(STT_FUNC), + .st_shndx = 1, + .st_value = 0, /* for now */ + .st_other = ELF_ST_VIS(STV_DEFAULT), + .st_size = 0, /* for now */ + } +}; + +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; +} + +enum { + TAG_CODE = 0, + TAG_SYMTAB = 1, + TAG_STRSYM = 2, +}; + +/* + * Update the hash using the given data, also prepending a (tag, len) prefix to + * ensure that distinct input tuples reliably result in distinct hashes. + */ +static void blake2s_update_tagged(struct blake2s_ctx *ctx, int tag, + const void *data, size_t len) +{ + u64 prefix = ((u64)tag << 56) | len; + + blake2s_update(ctx, (const u8 *)&prefix, sizeof(prefix)); + blake2s_update(ctx, data, len); +} + +/* + * fd: file descriptor open for writing for the output file + * load_addr: code load address (could be zero) + * sym: function name (for native code - used as the symbol) + * code: the native code + * csize: the code size in bytes + */ +int +jit_write_elf(int fd, uint64_t load_addr __maybe_unused, const char *sym, + const void *code, int csize, + 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_Phdr *phdr; + Elf_Shdr *shdr; + uint64_t eh_frame_base_offset; + char *strsym = NULL; + struct blake2s_ctx ctx; + int symlen; + int retval = -1; + + if (elf_version(EV_CURRENT) == EV_NONE) { + warnx("ELF initialization failed"); + return -1; + } + + e = elf_begin(fd, ELF_C_WRITE, NULL); + if (!e) { + warnx("elf_begin failed"); + goto error; + } + + /* + * setup ELF header + */ + ehdr = elf_newehdr(e); + if (!ehdr) { + warnx("cannot get ehdr"); + goto error; + } + + ehdr->e_ident[EI_DATA] = GEN_ELF_ENDIAN; + ehdr->e_ident[EI_CLASS] = GEN_ELF_CLASS; + ehdr->e_machine = GEN_ELF_ARCH; + ehdr->e_type = ET_DYN; + ehdr->e_entry = GEN_ELF_TEXT_OFFSET; + ehdr->e_version = EV_CURRENT; + ehdr->e_shstrndx= unwinding ? 4 : 2; /* shdr index for section name */ + + /* + * setup program header + */ + phdr = elf_newphdr(e, 1); + phdr[0].p_type = PT_LOAD; + phdr[0].p_offset = GEN_ELF_TEXT_OFFSET; + phdr[0].p_vaddr = GEN_ELF_TEXT_OFFSET; + phdr[0].p_paddr = GEN_ELF_TEXT_OFFSET; + phdr[0].p_filesz = csize; + phdr[0].p_memsz = csize; + phdr[0].p_flags = PF_X | PF_R; + phdr[0].p_align = 8; + + /* + * setup text section + */ + scn = elf_newscn(e); + if (!scn) { + warnx("cannot create section"); + goto error; + } + + d = elf_newdata(scn); + if (!d) { + warnx("cannot get new data"); + goto error; + } + + d->d_align = 16; + d->d_off = 0LL; + d->d_buf = (void *)code; + d->d_type = ELF_T_BYTE; + d->d_size = csize; + d->d_version = EV_CURRENT; + + shdr = elf_getshdr(scn); + if (!shdr) { + warnx("cannot get section header"); + goto error; + } + + shdr->sh_name = 1; + shdr->sh_type = SHT_PROGBITS; + shdr->sh_addr = GEN_ELF_TEXT_OFFSET; + shdr->sh_flags = SHF_EXECINSTR | SHF_ALLOC; + shdr->sh_entsize = 0; + + blake2s_init(&ctx, sizeof(bnote.build_id)); + blake2s_update_tagged(&ctx, TAG_CODE, code, csize); + + /* + * 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; + retval = -1; + } + + /* + * setup section headers string table + */ + scn = elf_newscn(e); + if (!scn) { + warnx("cannot create section"); + goto error; + } + + d = elf_newdata(scn); + if (!d) { + warnx("cannot get new data"); + goto error; + } + + d->d_align = 1; + d->d_off = 0LL; + d->d_buf = shd_string_table; + d->d_type = ELF_T_BYTE; + d->d_size = sizeof(shd_string_table); + d->d_version = EV_CURRENT; + + shdr = elf_getshdr(scn); + if (!shdr) { + warnx("cannot get section header"); + goto error; + } + + shdr->sh_name = 7; /* offset of '.shstrtab' in shd_string_table */ + shdr->sh_type = SHT_STRTAB; + shdr->sh_flags = 0; + shdr->sh_entsize = 0; + + /* + * setup symtab section + */ + symtab[1].st_size = csize; + symtab[1].st_value = GEN_ELF_TEXT_OFFSET; + + scn = elf_newscn(e); + if (!scn) { + warnx("cannot create section"); + goto error; + } + + d = elf_newdata(scn); + if (!d) { + warnx("cannot get new data"); + goto error; + } + + d->d_align = 8; + d->d_off = 0LL; + d->d_buf = symtab; + d->d_type = ELF_T_SYM; + d->d_size = sizeof(symtab); + d->d_version = EV_CURRENT; + + shdr = elf_getshdr(scn); + if (!shdr) { + warnx("cannot get section header"); + goto error; + } + + shdr->sh_name = 17; /* offset of '.symtab' in shd_string_table */ + shdr->sh_type = SHT_SYMTAB; + shdr->sh_flags = 0; + shdr->sh_entsize = sizeof(Elf_Sym); + shdr->sh_link = unwinding ? 6 : 4; /* index of .strtab section */ + + blake2s_update_tagged(&ctx, TAG_SYMTAB, symtab, sizeof(symtab)); + + /* + * setup symbols string table + * 2 = 1 for 0 in 1st entry, 1 for the 0 at end of symbol for 2nd entry + */ + symlen = 2 + strlen(sym); + strsym = calloc(1, symlen); + if (!strsym) { + warnx("cannot allocate strsym"); + goto error; + } + strcpy(strsym + 1, sym); + + scn = elf_newscn(e); + if (!scn) { + warnx("cannot create section"); + goto error; + } + + d = elf_newdata(scn); + if (!d) { + warnx("cannot get new data"); + goto error; + } + + d->d_align = 1; + d->d_off = 0LL; + d->d_buf = strsym; + d->d_type = ELF_T_BYTE; + d->d_size = symlen; + d->d_version = EV_CURRENT; + + shdr = elf_getshdr(scn); + if (!shdr) { + warnx("cannot get section header"); + goto error; + } + + shdr->sh_name = 25; /* offset in shd_string_table */ + shdr->sh_type = SHT_STRTAB; + shdr->sh_flags = 0; + shdr->sh_entsize = 0; + + blake2s_update_tagged(&ctx, TAG_STRSYM, strsym, symlen); + + /* + * setup build-id section + */ + scn = elf_newscn(e); + if (!scn) { + warnx("cannot create section"); + goto error; + } + + d = elf_newdata(scn); + if (!d) { + warnx("cannot get new data"); + goto error; + } + + /* + * build-id generation + */ + blake2s_final(&ctx, bnote.build_id); + bnote.desc.namesz = sizeof(bnote.name); /* must include 0 termination */ + bnote.desc.descsz = sizeof(bnote.build_id); + bnote.desc.type = NT_GNU_BUILD_ID; + strcpy(bnote.name, "GNU"); + + d->d_align = 4; + d->d_off = 0LL; + d->d_buf = &bnote; + d->d_type = ELF_T_BYTE; + d->d_size = sizeof(bnote); + d->d_version = EV_CURRENT; + + shdr = elf_getshdr(scn); + if (!shdr) { + warnx("cannot get section header"); + goto error; + } + + shdr->sh_name = 33; /* offset in shd_string_table */ + shdr->sh_type = SHT_NOTE; + shdr->sh_addr = 0x0; + shdr->sh_flags = SHF_ALLOC; + shdr->sh_size = sizeof(bnote); + shdr->sh_entsize = 0; + +#ifdef HAVE_LIBDW_SUPPORT + if (debug && nr_debug_entries) { + retval = jit_add_debug_info(e, load_addr, debug, nr_debug_entries); + if (retval) + goto error; + } else +#endif + { + if (elf_update(e, ELF_C_WRITE) < 0) { + warnx("elf_update 4 failed"); + goto error; + } + } + + retval = 0; +error: + (void)elf_end(e); + + free(strsym); + + return retval; +} -- cgit v1.3.1