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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /tools/objtool/include | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/objtool/include')
-rw-r--r-- | tools/objtool/include/objtool/arch.h | 97 | ||||
-rw-r--r-- | tools/objtool/include/objtool/builtin.h | 46 | ||||
-rw-r--r-- | tools/objtool/include/objtool/cfi.h | 40 | ||||
-rw-r--r-- | tools/objtool/include/objtool/check.h | 109 | ||||
-rw-r--r-- | tools/objtool/include/objtool/elf.h | 176 | ||||
-rw-r--r-- | tools/objtool/include/objtool/endianness.h | 38 | ||||
-rw-r--r-- | tools/objtool/include/objtool/objtool.h | 50 | ||||
-rw-r--r-- | tools/objtool/include/objtool/special.h | 42 | ||||
-rw-r--r-- | tools/objtool/include/objtool/warn.h | 67 |
9 files changed, 665 insertions, 0 deletions
diff --git a/tools/objtool/include/objtool/arch.h b/tools/objtool/include/objtool/arch.h new file mode 100644 index 000000000..861c0c60a --- /dev/null +++ b/tools/objtool/include/objtool/arch.h @@ -0,0 +1,97 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com> + */ + +#ifndef _ARCH_H +#define _ARCH_H + +#include <stdbool.h> +#include <linux/list.h> +#include <objtool/objtool.h> +#include <objtool/cfi.h> + +enum insn_type { + INSN_JUMP_CONDITIONAL, + INSN_JUMP_UNCONDITIONAL, + INSN_JUMP_DYNAMIC, + INSN_JUMP_DYNAMIC_CONDITIONAL, + INSN_CALL, + INSN_CALL_DYNAMIC, + INSN_RETURN, + INSN_CONTEXT_SWITCH, + INSN_BUG, + INSN_NOP, + INSN_STAC, + INSN_CLAC, + INSN_STD, + INSN_CLD, + INSN_TRAP, + INSN_ENDBR, + INSN_OTHER, +}; + +enum op_dest_type { + OP_DEST_REG, + OP_DEST_REG_INDIRECT, + OP_DEST_MEM, + OP_DEST_PUSH, + OP_DEST_PUSHF, +}; + +struct op_dest { + enum op_dest_type type; + unsigned char reg; + int offset; +}; + +enum op_src_type { + OP_SRC_REG, + OP_SRC_REG_INDIRECT, + OP_SRC_CONST, + OP_SRC_POP, + OP_SRC_POPF, + OP_SRC_ADD, + OP_SRC_AND, +}; + +struct op_src { + enum op_src_type type; + unsigned char reg; + int offset; +}; + +struct stack_op { + struct op_dest dest; + struct op_src src; + struct list_head list; +}; + +struct instruction; + +void arch_initial_func_cfi_state(struct cfi_init_state *state); + +int arch_decode_instruction(struct objtool_file *file, const struct section *sec, + unsigned long offset, unsigned int maxlen, + unsigned int *len, enum insn_type *type, + unsigned long *immediate, + struct list_head *ops_list); + +bool arch_callee_saved_reg(unsigned char reg); + +unsigned long arch_jump_destination(struct instruction *insn); + +unsigned long arch_dest_reloc_offset(int addend); + +const char *arch_nop_insn(int len); +const char *arch_ret_insn(int len); + +int arch_decode_hint_reg(u8 sp_reg, int *base); + +bool arch_is_retpoline(struct symbol *sym); +bool arch_is_rethunk(struct symbol *sym); +bool arch_is_embedded_insn(struct symbol *sym); + +int arch_rewrite_retpolines(struct objtool_file *file); + +#endif /* _ARCH_H */ diff --git a/tools/objtool/include/objtool/builtin.h b/tools/objtool/include/objtool/builtin.h new file mode 100644 index 000000000..42a52f1a0 --- /dev/null +++ b/tools/objtool/include/objtool/builtin.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com> + */ +#ifndef _BUILTIN_H +#define _BUILTIN_H + +#include <subcmd/parse-options.h> + +extern const struct option check_options[]; + +struct opts { + /* actions: */ + bool dump_orc; + bool hack_jump_label; + bool hack_noinstr; + bool ibt; + bool mcount; + bool noinstr; + bool orc; + bool retpoline; + bool rethunk; + bool unret; + bool sls; + bool stackval; + bool static_call; + bool uaccess; + + /* options: */ + bool backtrace; + bool backup; + bool dryrun; + bool link; + bool module; + bool no_unreachable; + bool sec_address; + bool stats; +}; + +extern struct opts opts; + +extern int cmd_parse_options(int argc, const char **argv, const char * const usage[]); + +extern int objtool_run(int argc, const char **argv); + +#endif /* _BUILTIN_H */ diff --git a/tools/objtool/include/objtool/cfi.h b/tools/objtool/include/objtool/cfi.h new file mode 100644 index 000000000..f11d1ac1d --- /dev/null +++ b/tools/objtool/include/objtool/cfi.h @@ -0,0 +1,40 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2015-2017 Josh Poimboeuf <jpoimboe@redhat.com> + */ + +#ifndef _OBJTOOL_CFI_H +#define _OBJTOOL_CFI_H + +#include <arch/cfi_regs.h> +#include <linux/list.h> + +#define CFI_UNDEFINED -1 +#define CFI_CFA -2 +#define CFI_SP_INDIRECT -3 +#define CFI_BP_INDIRECT -4 + +struct cfi_reg { + int base; + int offset; +}; + +struct cfi_init_state { + struct cfi_reg regs[CFI_NUM_REGS]; + struct cfi_reg cfa; +}; + +struct cfi_state { + struct hlist_node hash; /* must be first, cficmp() */ + struct cfi_reg regs[CFI_NUM_REGS]; + struct cfi_reg vals[CFI_NUM_REGS]; + struct cfi_reg cfa; + int stack_size; + int drap_reg, drap_offset; + unsigned char type; + bool bp_scratch; + bool drap; + bool end; +}; + +#endif /* _OBJTOOL_CFI_H */ diff --git a/tools/objtool/include/objtool/check.h b/tools/objtool/include/objtool/check.h new file mode 100644 index 000000000..036129ceb --- /dev/null +++ b/tools/objtool/include/objtool/check.h @@ -0,0 +1,109 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com> + */ + +#ifndef _CHECK_H +#define _CHECK_H + +#include <stdbool.h> +#include <objtool/cfi.h> +#include <objtool/arch.h> + +struct insn_state { + struct cfi_state cfi; + unsigned int uaccess_stack; + bool uaccess; + bool df; + bool noinstr; + s8 instr; +}; + +struct alt_group { + /* + * Pointer from a replacement group to the original group. NULL if it + * *is* the original group. + */ + struct alt_group *orig_group; + + /* First and last instructions in the group */ + struct instruction *first_insn, *last_insn; + + /* + * Byte-offset-addressed len-sized array of pointers to CFI structs. + * This is shared with the other alt_groups in the same alternative. + */ + struct cfi_state **cfi; +}; + +struct instruction { + struct list_head list; + struct hlist_node hash; + struct list_head call_node; + struct section *sec; + unsigned long offset; + unsigned int len; + enum insn_type type; + unsigned long immediate; + + u16 dead_end : 1, + ignore : 1, + ignore_alts : 1, + hint : 1, + save : 1, + restore : 1, + retpoline_safe : 1, + noendbr : 1, + entry : 1; + /* 7 bit hole */ + + s8 instr; + u8 visited; + + struct alt_group *alt_group; + struct symbol *call_dest; + struct instruction *jump_dest; + struct instruction *first_jump_src; + struct reloc *jump_table; + struct reloc *reloc; + struct list_head alts; + struct symbol *func; + struct list_head stack_ops; + struct cfi_state *cfi; +}; + +#define VISITED_BRANCH 0x01 +#define VISITED_BRANCH_UACCESS 0x02 +#define VISITED_BRANCH_MASK 0x03 +#define VISITED_ENTRY 0x04 + +static inline bool is_static_jump(struct instruction *insn) +{ + return insn->type == INSN_JUMP_CONDITIONAL || + insn->type == INSN_JUMP_UNCONDITIONAL; +} + +static inline bool is_dynamic_jump(struct instruction *insn) +{ + return insn->type == INSN_JUMP_DYNAMIC || + insn->type == INSN_JUMP_DYNAMIC_CONDITIONAL; +} + +static inline bool is_jump(struct instruction *insn) +{ + return is_static_jump(insn) || is_dynamic_jump(insn); +} + +struct instruction *find_insn(struct objtool_file *file, + struct section *sec, unsigned long offset); + +#define for_each_insn(file, insn) \ + list_for_each_entry(insn, &file->insn_list, list) + +#define sec_for_each_insn(file, sec, insn) \ + for (insn = find_insn(file, sec, 0); \ + insn && &insn->list != &file->insn_list && \ + insn->sec == sec; \ + insn = list_next_entry(insn, list)) + +#endif /* _CHECK_H */ diff --git a/tools/objtool/include/objtool/elf.h b/tools/objtool/include/objtool/elf.h new file mode 100644 index 000000000..5d4a841fb --- /dev/null +++ b/tools/objtool/include/objtool/elf.h @@ -0,0 +1,176 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com> + */ + +#ifndef _OBJTOOL_ELF_H +#define _OBJTOOL_ELF_H + +#include <stdio.h> +#include <gelf.h> +#include <linux/list.h> +#include <linux/hashtable.h> +#include <linux/rbtree.h> +#include <linux/jhash.h> + +#ifdef LIBELF_USE_DEPRECATED +# define elf_getshdrnum elf_getshnum +# define elf_getshdrstrndx elf_getshstrndx +#endif + +/* + * Fallback for systems without this "read, mmaping if possible" cmd. + */ +#ifndef ELF_C_READ_MMAP +#define ELF_C_READ_MMAP ELF_C_READ +#endif + +struct section { + struct list_head list; + struct hlist_node hash; + struct hlist_node name_hash; + GElf_Shdr sh; + struct rb_root symbol_tree; + struct list_head symbol_list; + struct list_head reloc_list; + struct section *base, *reloc; + struct symbol *sym; + Elf_Data *data; + char *name; + int idx; + bool changed, text, rodata, noinstr; +}; + +struct symbol { + struct list_head list; + struct rb_node node; + struct hlist_node hash; + struct hlist_node name_hash; + GElf_Sym sym; + struct section *sec; + char *name; + unsigned int idx; + unsigned char bind, type; + unsigned long offset; + unsigned int len; + struct symbol *pfunc, *cfunc, *alias; + u8 uaccess_safe : 1; + u8 static_call_tramp : 1; + u8 retpoline_thunk : 1; + u8 return_thunk : 1; + u8 fentry : 1; + u8 profiling_func : 1; + u8 embedded_insn : 1; + struct list_head pv_target; +}; + +struct reloc { + struct list_head list; + struct hlist_node hash; + union { + GElf_Rela rela; + GElf_Rel rel; + }; + struct section *sec; + struct symbol *sym; + unsigned long offset; + unsigned int type; + s64 addend; + int idx; + bool jump_table_start; +}; + +#define ELF_HASH_BITS 20 + +struct elf { + Elf *elf; + GElf_Ehdr ehdr; + int fd; + bool changed; + char *name; + unsigned int text_size, num_files; + struct list_head sections; + + int symbol_bits; + int symbol_name_bits; + int section_bits; + int section_name_bits; + int reloc_bits; + + struct hlist_head *symbol_hash; + struct hlist_head *symbol_name_hash; + struct hlist_head *section_hash; + struct hlist_head *section_name_hash; + struct hlist_head *reloc_hash; +}; + +#define OFFSET_STRIDE_BITS 4 +#define OFFSET_STRIDE (1UL << OFFSET_STRIDE_BITS) +#define OFFSET_STRIDE_MASK (~(OFFSET_STRIDE - 1)) + +#define for_offset_range(_offset, _start, _end) \ + for (_offset = ((_start) & OFFSET_STRIDE_MASK); \ + _offset >= ((_start) & OFFSET_STRIDE_MASK) && \ + _offset <= ((_end) & OFFSET_STRIDE_MASK); \ + _offset += OFFSET_STRIDE) + +static inline u32 sec_offset_hash(struct section *sec, unsigned long offset) +{ + u32 ol, oh, idx = sec->idx; + + offset &= OFFSET_STRIDE_MASK; + + ol = offset; + oh = (offset >> 16) >> 16; + + __jhash_mix(ol, oh, idx); + + return ol; +} + +static inline u32 reloc_hash(struct reloc *reloc) +{ + return sec_offset_hash(reloc->sec, reloc->offset); +} + +/* + * Try to see if it's a whole archive (vmlinux.o or module). + * + * Note this will miss the case where a module only has one source file. + */ +static inline bool has_multiple_files(struct elf *elf) +{ + return elf->num_files > 1; +} + +struct elf *elf_open_read(const char *name, int flags); +struct section *elf_create_section(struct elf *elf, const char *name, unsigned int sh_flags, size_t entsize, int nr); + +int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset, + unsigned int type, struct symbol *sym, s64 addend); +int elf_add_reloc_to_insn(struct elf *elf, struct section *sec, + unsigned long offset, unsigned int type, + struct section *insn_sec, unsigned long insn_off); + +int elf_write_insn(struct elf *elf, struct section *sec, + unsigned long offset, unsigned int len, + const char *insn); +int elf_write_reloc(struct elf *elf, struct reloc *reloc); +int elf_write(struct elf *elf); +void elf_close(struct elf *elf); + +struct section *find_section_by_name(const struct elf *elf, const char *name); +struct symbol *find_func_by_offset(struct section *sec, unsigned long offset); +struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset); +struct symbol *find_symbol_by_name(const struct elf *elf, const char *name); +struct symbol *find_symbol_containing(const struct section *sec, unsigned long offset); +int find_symbol_hole_containing(const struct section *sec, unsigned long offset); +struct reloc *find_reloc_by_dest(const struct elf *elf, struct section *sec, unsigned long offset); +struct reloc *find_reloc_by_dest_range(const struct elf *elf, struct section *sec, + unsigned long offset, unsigned int len); +struct symbol *find_func_containing(struct section *sec, unsigned long offset); + +#define for_each_sec(file, sec) \ + list_for_each_entry(sec, &file->elf->sections, list) + +#endif /* _OBJTOOL_ELF_H */ diff --git a/tools/objtool/include/objtool/endianness.h b/tools/objtool/include/objtool/endianness.h new file mode 100644 index 000000000..10241341e --- /dev/null +++ b/tools/objtool/include/objtool/endianness.h @@ -0,0 +1,38 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef _OBJTOOL_ENDIANNESS_H +#define _OBJTOOL_ENDIANNESS_H + +#include <arch/endianness.h> +#include <linux/kernel.h> +#include <endian.h> + +#ifndef __TARGET_BYTE_ORDER +#error undefined arch __TARGET_BYTE_ORDER +#endif + +#if __BYTE_ORDER != __TARGET_BYTE_ORDER +#define __NEED_BSWAP 1 +#else +#define __NEED_BSWAP 0 +#endif + +/* + * Does a byte swap if target endianness doesn't match the host, i.e. cross + * compilation for little endian on big endian and vice versa. + * To be used for multi-byte values conversion, which are read from / about + * to be written to a target native endianness ELF file. + */ +#define bswap_if_needed(val) \ +({ \ + __typeof__(val) __ret; \ + switch (sizeof(val)) { \ + case 8: __ret = __NEED_BSWAP ? bswap_64(val) : (val); break; \ + case 4: __ret = __NEED_BSWAP ? bswap_32(val) : (val); break; \ + case 2: __ret = __NEED_BSWAP ? bswap_16(val) : (val); break; \ + default: \ + BUILD_BUG(); break; \ + } \ + __ret; \ +}) + +#endif /* _OBJTOOL_ENDIANNESS_H */ diff --git a/tools/objtool/include/objtool/objtool.h b/tools/objtool/include/objtool/objtool.h new file mode 100644 index 000000000..7f2d1b095 --- /dev/null +++ b/tools/objtool/include/objtool/objtool.h @@ -0,0 +1,50 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2020 Matt Helsley <mhelsley@vmware.com> + */ + +#ifndef _OBJTOOL_H +#define _OBJTOOL_H + +#include <stdbool.h> +#include <linux/list.h> +#include <linux/hashtable.h> + +#include <objtool/elf.h> + +#define __weak __attribute__((weak)) + +struct pv_state { + bool clean; + struct list_head targets; +}; + +struct objtool_file { + struct elf *elf; + struct list_head insn_list; + DECLARE_HASHTABLE(insn_hash, 20); + struct list_head retpoline_call_list; + struct list_head return_thunk_list; + struct list_head static_call_list; + struct list_head mcount_loc_list; + struct list_head endbr_list; + bool ignore_unreachables, hints, rodata; + + unsigned int nr_endbr; + unsigned int nr_endbr_int; + + unsigned long jl_short, jl_long; + unsigned long jl_nop_short, jl_nop_long; + + struct pv_state *pv_ops; +}; + +struct objtool_file *objtool_open_read(const char *_objname); + +void objtool_pv_add(struct objtool_file *file, int idx, struct symbol *func); + +int check(struct objtool_file *file); +int orc_dump(const char *objname); +int orc_create(struct objtool_file *file); + +#endif /* _OBJTOOL_H */ diff --git a/tools/objtool/include/objtool/special.h b/tools/objtool/include/objtool/special.h new file mode 100644 index 000000000..dc4721e19 --- /dev/null +++ b/tools/objtool/include/objtool/special.h @@ -0,0 +1,42 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com> + */ + +#ifndef _SPECIAL_H +#define _SPECIAL_H + +#include <stdbool.h> +#include <objtool/check.h> +#include <objtool/elf.h> + +#define C_JUMP_TABLE_SECTION ".rodata..c_jump_table" + +struct special_alt { + struct list_head list; + + bool group; + bool skip_orig; + bool skip_alt; + bool jump_or_nop; + + struct section *orig_sec; + unsigned long orig_off; + + struct section *new_sec; + unsigned long new_off; + + unsigned int orig_len, new_len; /* group only */ + u8 key_addend; +}; + +int special_get_alts(struct elf *elf, struct list_head *alts); + +void arch_handle_alternative(unsigned short feature, struct special_alt *alt); + +bool arch_support_alt_relocation(struct special_alt *special_alt, + struct instruction *insn, + struct reloc *reloc); +struct reloc *arch_find_switch_table(struct objtool_file *file, + struct instruction *insn); +#endif /* _SPECIAL_H */ diff --git a/tools/objtool/include/objtool/warn.h b/tools/objtool/include/objtool/warn.h new file mode 100644 index 000000000..a3e79ae75 --- /dev/null +++ b/tools/objtool/include/objtool/warn.h @@ -0,0 +1,67 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com> + */ + +#ifndef _WARN_H +#define _WARN_H + +#include <stdlib.h> +#include <string.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <objtool/builtin.h> +#include <objtool/elf.h> + +extern const char *objname; + +static inline char *offstr(struct section *sec, unsigned long offset) +{ + bool is_text = (sec->sh.sh_flags & SHF_EXECINSTR); + struct symbol *sym = NULL; + char *str; + int len; + + if (is_text) + sym = find_func_containing(sec, offset); + if (!sym) + sym = find_symbol_containing(sec, offset); + + if (sym) { + str = malloc(strlen(sym->name) + strlen(sec->name) + 40); + len = sprintf(str, "%s+0x%lx", sym->name, offset - sym->offset); + if (opts.sec_address) + sprintf(str+len, " (%s+0x%lx)", sec->name, offset); + } else { + str = malloc(strlen(sec->name) + 20); + sprintf(str, "%s+0x%lx", sec->name, offset); + } + + return str; +} + +#define WARN(format, ...) \ + fprintf(stderr, \ + "%s: warning: objtool: " format "\n", \ + objname, ##__VA_ARGS__) + +#define WARN_FUNC(format, sec, offset, ...) \ +({ \ + char *_str = offstr(sec, offset); \ + WARN("%s: " format, _str, ##__VA_ARGS__); \ + free(_str); \ +}) + +#define BT_FUNC(format, insn, ...) \ +({ \ + struct instruction *_insn = (insn); \ + char *_str = offstr(_insn->sec, _insn->offset); \ + WARN(" %s: " format, _str, ##__VA_ARGS__); \ + free(_str); \ +}) + +#define WARN_ELF(format, ...) \ + WARN(format ": %s", ##__VA_ARGS__, elf_errmsg(-1)) + +#endif /* _WARN_H */ |