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kernel/tools/perf/util/disasm.c

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// SPDX-License-Identifier: GPL-2.0-only
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <libgen.h>
#include <regex.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/string.h>
#include <subcmd/run-command.h>
#include "annotate.h"
#include "annotate-data.h"
#include "build-id.h"
#include "debug.h"
#include "disasm.h"
#include "disasm_bpf.h"
#include "dso.h"
#include "env.h"
#include "evsel.h"
#include "map.h"
#include "maps.h"
#include "namespaces.h"
#include "srcline.h"
#include "symbol.h"
#include "util.h"
static regex_t file_lineno;
/* These can be referred from the arch-dependent code */
static struct ins_ops call_ops;
static struct ins_ops dec_ops;
static struct ins_ops jump_ops;
static struct ins_ops mov_ops;
static struct ins_ops nop_ops;
static struct ins_ops lock_ops;
static struct ins_ops ret_ops;
static struct ins_ops load_store_ops;
static struct ins_ops arithmetic_ops;
static int jump__scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name);
static int call__scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name);
static void ins__sort(struct arch *arch);
static int disasm_line__parse(char *line, const char **namep, char **rawp);
static int disasm_line__parse_powerpc(struct disasm_line *dl);
static char *expand_tabs(char *line, char **storage, size_t *storage_len);
static __attribute__((constructor)) void symbol__init_regexpr(void)
{
regcomp(&file_lineno, "^/[^:]+:([0-9]+)", REG_EXTENDED);
}
static int arch__grow_instructions(struct arch *arch)
{
struct ins *new_instructions;
size_t new_nr_allocated;
if (arch->nr_instructions_allocated == 0 && arch->instructions)
goto grow_from_non_allocated_table;
new_nr_allocated = arch->nr_instructions_allocated + 128;
new_instructions = realloc(arch->instructions, new_nr_allocated * sizeof(struct ins));
if (new_instructions == NULL)
return -1;
out_update_instructions:
arch->instructions = new_instructions;
arch->nr_instructions_allocated = new_nr_allocated;
return 0;
grow_from_non_allocated_table:
new_nr_allocated = arch->nr_instructions + 128;
new_instructions = calloc(new_nr_allocated, sizeof(struct ins));
if (new_instructions == NULL)
return -1;
memcpy(new_instructions, arch->instructions, arch->nr_instructions);
goto out_update_instructions;
}
static int arch__associate_ins_ops(struct arch* arch, const char *name, struct ins_ops *ops)
{
struct ins *ins;
if (arch->nr_instructions == arch->nr_instructions_allocated &&
arch__grow_instructions(arch))
return -1;
ins = &arch->instructions[arch->nr_instructions];
ins->name = strdup(name);
if (!ins->name)
return -1;
ins->ops = ops;
arch->nr_instructions++;
ins__sort(arch);
return 0;
}
#include "arch/arc/annotate/instructions.c"
#include "arch/arm/annotate/instructions.c"
#include "arch/arm64/annotate/instructions.c"
#include "arch/csky/annotate/instructions.c"
#include "arch/loongarch/annotate/instructions.c"
#include "arch/mips/annotate/instructions.c"
#include "arch/x86/annotate/instructions.c"
#include "arch/powerpc/annotate/instructions.c"
#include "arch/riscv64/annotate/instructions.c"
#include "arch/s390/annotate/instructions.c"
#include "arch/sparc/annotate/instructions.c"
static struct arch architectures[] = {
{
.name = "arc",
.init = arc__annotate_init,
},
{
.name = "arm",
.init = arm__annotate_init,
},
{
.name = "arm64",
.init = arm64__annotate_init,
},
{
.name = "csky",
.init = csky__annotate_init,
},
{
.name = "mips",
.init = mips__annotate_init,
.objdump = {
.comment_char = '#',
},
},
{
.name = "x86",
.init = x86__annotate_init,
.instructions = x86__instructions,
.nr_instructions = ARRAY_SIZE(x86__instructions),
.insn_suffix = "bwlq",
.objdump = {
.comment_char = '#',
.register_char = '%',
.memory_ref_char = '(',
.imm_char = '$',
},
#ifdef HAVE_DWARF_SUPPORT
.update_insn_state = update_insn_state_x86,
#endif
},
{
.name = "powerpc",
.init = powerpc__annotate_init,
#ifdef HAVE_DWARF_SUPPORT
.update_insn_state = update_insn_state_powerpc,
#endif
},
{
.name = "riscv64",
.init = riscv64__annotate_init,
},
{
.name = "s390",
.init = s390__annotate_init,
.objdump = {
.comment_char = '#',
},
},
{
.name = "sparc",
.init = sparc__annotate_init,
.objdump = {
.comment_char = '#',
},
},
{
.name = "loongarch",
.init = loongarch__annotate_init,
.objdump = {
.comment_char = '#',
},
},
};
static int arch__key_cmp(const void *name, const void *archp)
{
const struct arch *arch = archp;
return strcmp(name, arch->name);
}
static int arch__cmp(const void *a, const void *b)
{
const struct arch *aa = a;
const struct arch *ab = b;
return strcmp(aa->name, ab->name);
}
static void arch__sort(void)
{
const int nmemb = ARRAY_SIZE(architectures);
qsort(architectures, nmemb, sizeof(struct arch), arch__cmp);
}
struct arch *arch__find(const char *name)
{
const int nmemb = ARRAY_SIZE(architectures);
static bool sorted;
if (!sorted) {
arch__sort();
sorted = true;
}
return bsearch(name, architectures, nmemb, sizeof(struct arch), arch__key_cmp);
}
bool arch__is(struct arch *arch, const char *name)
{
return !strcmp(arch->name, name);
}
static void ins_ops__delete(struct ins_operands *ops)
{
if (ops == NULL)
return;
zfree(&ops->source.raw);
zfree(&ops->source.name);
zfree(&ops->target.raw);
zfree(&ops->target.name);
}
static int ins__raw_scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name)
{
return scnprintf(bf, size, "%-*s %s", max_ins_name, ins->name, ops->raw);
}
int ins__scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name)
{
if (ins->ops->scnprintf)
return ins->ops->scnprintf(ins, bf, size, ops, max_ins_name);
return ins__raw_scnprintf(ins, bf, size, ops, max_ins_name);
}
bool ins__is_fused(struct arch *arch, const char *ins1, const char *ins2)
{
if (!arch || !arch->ins_is_fused)
return false;
return arch->ins_is_fused(arch, ins1, ins2);
}
static int call__parse(struct arch *arch, struct ins_operands *ops, struct map_symbol *ms,
struct disasm_line *dl __maybe_unused)
{
char *endptr, *tok, *name;
struct map *map = ms->map;
struct addr_map_symbol target = {
.ms = { .map = map, },
};
ops->target.addr = strtoull(ops->raw, &endptr, 16);
name = strchr(endptr, '<');
if (name == NULL)
goto indirect_call;
name++;
if (arch->objdump.skip_functions_char &&
strchr(name, arch->objdump.skip_functions_char))
return -1;
tok = strchr(name, '>');
if (tok == NULL)
return -1;
*tok = '\0';
ops->target.name = strdup(name);
*tok = '>';
if (ops->target.name == NULL)
return -1;
find_target:
target.addr = map__objdump_2mem(map, ops->target.addr);
if (maps__find_ams(ms->maps, &target) == 0 &&
map__rip_2objdump(target.ms.map, map__map_ip(target.ms.map, target.addr)) == ops->target.addr)
ops->target.sym = target.ms.sym;
return 0;
indirect_call:
tok = strchr(endptr, '*');
if (tok != NULL) {
endptr++;
/* Indirect call can use a non-rip register and offset: callq *0x8(%rbx).
* Do not parse such instruction. */
if (strstr(endptr, "(%r") == NULL)
ops->target.addr = strtoull(endptr, NULL, 16);
}
goto find_target;
}
static int call__scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name)
{
if (ops->target.sym)
return scnprintf(bf, size, "%-*s %s", max_ins_name, ins->name, ops->target.sym->name);
if (ops->target.addr == 0)
return ins__raw_scnprintf(ins, bf, size, ops, max_ins_name);
if (ops->target.name)
return scnprintf(bf, size, "%-*s %s", max_ins_name, ins->name, ops->target.name);
return scnprintf(bf, size, "%-*s *%" PRIx64, max_ins_name, ins->name, ops->target.addr);
}
static struct ins_ops call_ops = {
.parse = call__parse,
.scnprintf = call__scnprintf,
};
bool ins__is_call(const struct ins *ins)
{
return ins->ops == &call_ops || ins->ops == &s390_call_ops || ins->ops == &loongarch_call_ops;
}
/*
* Prevents from matching commas in the comment section, e.g.:
* ffff200008446e70: b.cs ffff2000084470f4 <generic_exec_single+0x314> // b.hs, b.nlast
*
* and skip comma as part of function arguments, e.g.:
* 1d8b4ac <linemap_lookup(line_maps const*, unsigned int)+0xcc>
*/
static inline const char *validate_comma(const char *c, struct ins_operands *ops)
{
if (ops->jump.raw_comment && c > ops->jump.raw_comment)
return NULL;
if (ops->jump.raw_func_start && c > ops->jump.raw_func_start)
return NULL;
return c;
}
static int jump__parse(struct arch *arch, struct ins_operands *ops, struct map_symbol *ms,
struct disasm_line *dl __maybe_unused)
{
struct map *map = ms->map;
struct symbol *sym = ms->sym;
struct addr_map_symbol target = {
.ms = { .map = map, },
};
const char *c = strchr(ops->raw, ',');
u64 start, end;
ops->jump.raw_comment = strchr(ops->raw, arch->objdump.comment_char);
ops->jump.raw_func_start = strchr(ops->raw, '<');
c = validate_comma(c, ops);
/*
* Examples of lines to parse for the _cpp_lex_token@@Base
* function:
*
* 1159e6c: jne 115aa32 <_cpp_lex_token@@Base+0xf92>
* 1159e8b: jne c469be <cpp_named_operator2name@@Base+0xa72>
*
* The first is a jump to an offset inside the same function,
* the second is to another function, i.e. that 0xa72 is an
* offset in the cpp_named_operator2name@@base function.
*/
/*
* skip over possible up to 2 operands to get to address, e.g.:
* tbnz w0, #26, ffff0000083cd190 <security_file_permission+0xd0>
*/
if (c++ != NULL) {
ops->target.addr = strtoull(c, NULL, 16);
if (!ops->target.addr) {
c = strchr(c, ',');
c = validate_comma(c, ops);
if (c++ != NULL)
ops->target.addr = strtoull(c, NULL, 16);
}
} else {
ops->target.addr = strtoull(ops->raw, NULL, 16);
}
target.addr = map__objdump_2mem(map, ops->target.addr);
start = map__unmap_ip(map, sym->start);
end = map__unmap_ip(map, sym->end);
ops->target.outside = target.addr < start || target.addr > end;
/*
* FIXME: things like this in _cpp_lex_token (gcc's cc1 program):
cpp_named_operator2name@@Base+0xa72
* Point to a place that is after the cpp_named_operator2name
* boundaries, i.e. in the ELF symbol table for cc1
* cpp_named_operator2name is marked as being 32-bytes long, but it in
* fact is much larger than that, so we seem to need a symbols__find()
* routine that looks for >= current->start and < next_symbol->start,
* possibly just for C++ objects?
*
* For now lets just make some progress by marking jumps to outside the
* current function as call like.
*
* Actual navigation will come next, with further understanding of how
* the symbol searching and disassembly should be done.
*/
if (maps__find_ams(ms->maps, &target) == 0 &&
map__rip_2objdump(target.ms.map, map__map_ip(target.ms.map, target.addr)) == ops->target.addr)
ops->target.sym = target.ms.sym;
if (!ops->target.outside) {
ops->target.offset = target.addr - start;
ops->target.offset_avail = true;
} else {
ops->target.offset_avail = false;
}
return 0;
}
static int jump__scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name)
{
const char *c;
if (!ops->target.addr || ops->target.offset < 0)
return ins__raw_scnprintf(ins, bf, size, ops, max_ins_name);
if (ops->target.outside && ops->target.sym != NULL)
return scnprintf(bf, size, "%-*s %s", max_ins_name, ins->name, ops->target.sym->name);
c = strchr(ops->raw, ',');
c = validate_comma(c, ops);
if (c != NULL) {
const char *c2 = strchr(c + 1, ',');
c2 = validate_comma(c2, ops);
/* check for 3-op insn */
if (c2 != NULL)
c = c2;
c++;
/* mirror arch objdump's space-after-comma style */
if (*c == ' ')
c++;
}
return scnprintf(bf, size, "%-*s %.*s%" PRIx64, max_ins_name,
ins->name, c ? c - ops->raw : 0, ops->raw,
ops->target.offset);
}
static void jump__delete(struct ins_operands *ops __maybe_unused)
{
/*
* The ops->jump.raw_comment and ops->jump.raw_func_start belong to the
* raw string, don't free them.
*/
}
static struct ins_ops jump_ops = {
.free = jump__delete,
.parse = jump__parse,
.scnprintf = jump__scnprintf,
};
bool ins__is_jump(const struct ins *ins)
{
return ins->ops == &jump_ops || ins->ops == &loongarch_jump_ops;
}
static int comment__symbol(char *raw, char *comment, u64 *addrp, char **namep)
{
char *endptr, *name, *t;
if (strstr(raw, "(%rip)") == NULL)
return 0;
*addrp = strtoull(comment, &endptr, 16);
if (endptr == comment)
return 0;
name = strchr(endptr, '<');
if (name == NULL)
return -1;
name++;
t = strchr(name, '>');
if (t == NULL)
return 0;
*t = '\0';
*namep = strdup(name);
*t = '>';
return 0;
}
static int lock__parse(struct arch *arch, struct ins_operands *ops, struct map_symbol *ms,
struct disasm_line *dl __maybe_unused)
{
ops->locked.ops = zalloc(sizeof(*ops->locked.ops));
if (ops->locked.ops == NULL)
return 0;
if (disasm_line__parse(ops->raw, &ops->locked.ins.name, &ops->locked.ops->raw) < 0)
goto out_free_ops;
ops->locked.ins.ops = ins__find(arch, ops->locked.ins.name, 0);
if (ops->locked.ins.ops == NULL)
goto out_free_ops;
if (ops->locked.ins.ops->parse &&
ops->locked.ins.ops->parse(arch, ops->locked.ops, ms, NULL) < 0)
goto out_free_ops;
return 0;
out_free_ops:
zfree(&ops->locked.ops);
return 0;
}
static int lock__scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name)
{
int printed;
if (ops->locked.ins.ops == NULL)
return ins__raw_scnprintf(ins, bf, size, ops, max_ins_name);
printed = scnprintf(bf, size, "%-*s ", max_ins_name, ins->name);
return printed + ins__scnprintf(&ops->locked.ins, bf + printed,
size - printed, ops->locked.ops, max_ins_name);
}
static void lock__delete(struct ins_operands *ops)
{
struct ins *ins = &ops->locked.ins;
if (ins->ops && ins->ops->free)
ins->ops->free(ops->locked.ops);
else
ins_ops__delete(ops->locked.ops);
zfree(&ops->locked.ops);
zfree(&ops->locked.ins.name);
zfree(&ops->target.raw);
zfree(&ops->target.name);
}
static struct ins_ops lock_ops = {
.free = lock__delete,
.parse = lock__parse,
.scnprintf = lock__scnprintf,
};
/*
* Check if the operand has more than one registers like x86 SIB addressing:
* 0x1234(%rax, %rbx, 8)
*
* But it doesn't care segment selectors like %gs:0x5678(%rcx), so just check
* the input string after 'memory_ref_char' if exists.
*/
static bool check_multi_regs(struct arch *arch, const char *op)
{
int count = 0;
if (arch->objdump.register_char == 0)
return false;
if (arch->objdump.memory_ref_char) {
op = strchr(op, arch->objdump.memory_ref_char);
if (op == NULL)
return false;
}
while ((op = strchr(op, arch->objdump.register_char)) != NULL) {
count++;
op++;
}
return count > 1;
}
static int mov__parse(struct arch *arch, struct ins_operands *ops, struct map_symbol *ms __maybe_unused,
struct disasm_line *dl __maybe_unused)
{
char *s = strchr(ops->raw, ','), *target, *comment, prev;
if (s == NULL)
return -1;
*s = '\0';
/*
* x86 SIB addressing has something like 0x8(%rax, %rcx, 1)
* then it needs to have the closing parenthesis.
*/
if (strchr(ops->raw, '(')) {
*s = ',';
s = strchr(ops->raw, ')');
if (s == NULL || s[1] != ',')
return -1;
*++s = '\0';
}
ops->source.raw = strdup(ops->raw);
*s = ',';
if (ops->source.raw == NULL)
return -1;
ops->source.multi_regs = check_multi_regs(arch, ops->source.raw);
target = skip_spaces(++s);
comment = strchr(s, arch->objdump.comment_char);
if (comment != NULL)
s = comment - 1;
else
s = strchr(s, '\0') - 1;
while (s > target && isspace(s[0]))
--s;
s++;
prev = *s;
*s = '\0';
ops->target.raw = strdup(target);
*s = prev;
if (ops->target.raw == NULL)
goto out_free_source;
ops->target.multi_regs = check_multi_regs(arch, ops->target.raw);
if (comment == NULL)
return 0;
comment = skip_spaces(comment);
comment__symbol(ops->source.raw, comment + 1, &ops->source.addr, &ops->source.name);
comment__symbol(ops->target.raw, comment + 1, &ops->target.addr, &ops->target.name);
return 0;
out_free_source:
zfree(&ops->source.raw);
return -1;
}
static int mov__scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name)
{
return scnprintf(bf, size, "%-*s %s,%s", max_ins_name, ins->name,
ops->source.name ?: ops->source.raw,
ops->target.name ?: ops->target.raw);
}
static struct ins_ops mov_ops = {
.parse = mov__parse,
.scnprintf = mov__scnprintf,
};
#define PPC_22_30(R) (((R) >> 1) & 0x1ff)
#define MINUS_EXT_XO_FORM 234
#define SUB_EXT_XO_FORM 232
#define ADD_ZERO_EXT_XO_FORM 202
#define SUB_ZERO_EXT_XO_FORM 200
static int arithmetic__scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name)
{
return scnprintf(bf, size, "%-*s %s", max_ins_name, ins->name,
ops->raw);
}
/*
* Sets the fields: multi_regs and "mem_ref".
* "mem_ref" is set for ops->source which is later used to
* fill the objdump->memory_ref-char field. This ops is currently
* used by powerpc and since binary instruction code is used to
* extract opcode, regs and offset, no other parsing is needed here.
*
* Dont set multi regs for 4 cases since it has only one operand
* for source:
* - Add to Minus One Extended XO-form ( Ex: addme, addmeo )
* - Subtract From Minus One Extended XO-form ( Ex: subfme )
* - Add to Zero Extended XO-form ( Ex: addze, addzeo )
* - Subtract From Zero Extended XO-form ( Ex: subfze )
*/
static int arithmetic__parse(struct arch *arch __maybe_unused, struct ins_operands *ops,
struct map_symbol *ms __maybe_unused, struct disasm_line *dl)
{
int opcode = PPC_OP(dl->raw.raw_insn);
ops->source.mem_ref = false;
if (opcode == 31) {
if ((opcode != MINUS_EXT_XO_FORM) && (opcode != SUB_EXT_XO_FORM) \
&& (opcode != ADD_ZERO_EXT_XO_FORM) && (opcode != SUB_ZERO_EXT_XO_FORM))
ops->source.multi_regs = true;
}
ops->target.mem_ref = false;
ops->target.multi_regs = false;
return 0;
}
static struct ins_ops arithmetic_ops = {
.parse = arithmetic__parse,
.scnprintf = arithmetic__scnprintf,
};
static int load_store__scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name)
{
return scnprintf(bf, size, "%-*s %s", max_ins_name, ins->name,
ops->raw);
}
/*
* Sets the fields: multi_regs and "mem_ref".
* "mem_ref" is set for ops->source which is later used to
* fill the objdump->memory_ref-char field. This ops is currently
* used by powerpc and since binary instruction code is used to
* extract opcode, regs and offset, no other parsing is needed here
*/
static int load_store__parse(struct arch *arch __maybe_unused, struct ins_operands *ops,
struct map_symbol *ms __maybe_unused, struct disasm_line *dl __maybe_unused)
{
ops->source.mem_ref = true;
ops->source.multi_regs = false;
/* opcode 31 is of X form */
if (PPC_OP(dl->raw.raw_insn) == 31)
ops->source.multi_regs = true;
ops->target.mem_ref = false;
ops->target.multi_regs = false;
return 0;
}
static struct ins_ops load_store_ops = {
.parse = load_store__parse,
.scnprintf = load_store__scnprintf,
};
static int dec__parse(struct arch *arch __maybe_unused, struct ins_operands *ops, struct map_symbol *ms __maybe_unused,
struct disasm_line *dl __maybe_unused)
{
char *target, *comment, *s, prev;
target = s = ops->raw;
while (s[0] != '\0' && !isspace(s[0]))
++s;
prev = *s;
*s = '\0';
ops->target.raw = strdup(target);
*s = prev;
if (ops->target.raw == NULL)
return -1;
comment = strchr(s, arch->objdump.comment_char);
if (comment == NULL)
return 0;
comment = skip_spaces(comment);
comment__symbol(ops->target.raw, comment + 1, &ops->target.addr, &ops->target.name);
return 0;
}
static int dec__scnprintf(struct ins *ins, char *bf, size_t size,
struct ins_operands *ops, int max_ins_name)
{
return scnprintf(bf, size, "%-*s %s", max_ins_name, ins->name,
ops->target.name ?: ops->target.raw);
}
static struct ins_ops dec_ops = {
.parse = dec__parse,
.scnprintf = dec__scnprintf,
};
static int nop__scnprintf(struct ins *ins __maybe_unused, char *bf, size_t size,
struct ins_operands *ops __maybe_unused, int max_ins_name)
{
return scnprintf(bf, size, "%-*s", max_ins_name, "nop");
}
static struct ins_ops nop_ops = {
.scnprintf = nop__scnprintf,
};
static struct ins_ops ret_ops = {
.scnprintf = ins__raw_scnprintf,
};
bool ins__is_nop(const struct ins *ins)
{
return ins->ops == &nop_ops;
}
bool ins__is_ret(const struct ins *ins)
{
return ins->ops == &ret_ops;
}
bool ins__is_lock(const struct ins *ins)
{
return ins->ops == &lock_ops;
}
static int ins__key_cmp(const void *name, const void *insp)
{
const struct ins *ins = insp;
return strcmp(name, ins->name);
}
static int ins__cmp(const void *a, const void *b)
{
const struct ins *ia = a;
const struct ins *ib = b;
return strcmp(ia->name, ib->name);
}
static void ins__sort(struct arch *arch)
{
const int nmemb = arch->nr_instructions;
qsort(arch->instructions, nmemb, sizeof(struct ins), ins__cmp);
}
static struct ins_ops *__ins__find(struct arch *arch, const char *name, struct disasm_line *dl)
{
struct ins *ins;
const int nmemb = arch->nr_instructions;
if (arch__is(arch, "powerpc")) {
/*
* For powerpc, identify the instruction ops
* from the opcode using raw_insn.
*/
struct ins_ops *ops;
ops = check_ppc_insn(dl);
if (ops)
return ops;
}
if (!arch->sorted_instructions) {
ins__sort(arch);
arch->sorted_instructions = true;
}
ins = bsearch(name, arch->instructions, nmemb, sizeof(struct ins), ins__key_cmp);
if (ins)
return ins->ops;
if (arch->insn_suffix) {
char tmp[32];
char suffix;
size_t len = strlen(name);
if (len == 0 || len >= sizeof(tmp))
return NULL;
suffix = name[len - 1];
if (strchr(arch->insn_suffix, suffix) == NULL)
return NULL;
strcpy(tmp, name);
tmp[len - 1] = '\0'; /* remove the suffix and check again */
ins = bsearch(tmp, arch->instructions, nmemb, sizeof(struct ins), ins__key_cmp);
}
return ins ? ins->ops : NULL;
}
struct ins_ops *ins__find(struct arch *arch, const char *name, struct disasm_line *dl)
{
struct ins_ops *ops = __ins__find(arch, name, dl);
if (!ops && arch->associate_instruction_ops)
ops = arch->associate_instruction_ops(arch, name);
return ops;
}
static void disasm_line__init_ins(struct disasm_line *dl, struct arch *arch, struct map_symbol *ms)
{
dl->ins.ops = ins__find(arch, dl->ins.name, dl);
if (!dl->ins.ops)
return;
if (dl->ins.ops->parse && dl->ins.ops->parse(arch, &dl->ops, ms, dl) < 0)
dl->ins.ops = NULL;
}
static int disasm_line__parse(char *line, const char **namep, char **rawp)
{
char tmp, *name = skip_spaces(line);
if (name[0] == '\0')
return -1;
*rawp = name + 1;
while ((*rawp)[0] != '\0' && !isspace((*rawp)[0]))
++*rawp;
tmp = (*rawp)[0];
(*rawp)[0] = '\0';
*namep = strdup(name);
if (*namep == NULL)
goto out;
(*rawp)[0] = tmp;
*rawp = strim(*rawp);
return 0;
out:
return -1;
}
/*
* Parses the result captured from symbol__disassemble_*
* Example, line read from DSO file in powerpc:
* line: 38 01 81 e8
* opcode: fetched from arch specific get_opcode_insn
* rawp_insn: e8810138
*
* rawp_insn is used later to extract the reg/offset fields
*/
#define PPC_OP(op) (((op) >> 26) & 0x3F)
#define RAW_BYTES 11
static int disasm_line__parse_powerpc(struct disasm_line *dl)
{
char *line = dl->al.line;
const char **namep = &dl->ins.name;
char **rawp = &dl->ops.raw;
char *tmp_raw_insn, *name_raw_insn = skip_spaces(line);
char *name = skip_spaces(name_raw_insn + RAW_BYTES);
int objdump = 0;
if (strlen(line) > RAW_BYTES)
objdump = 1;
if (name_raw_insn[0] == '\0')
return -1;
if (objdump) {
disasm_line__parse(name, namep, rawp);
} else
*namep = "";
tmp_raw_insn = strndup(name_raw_insn, 11);
if (tmp_raw_insn == NULL)
return -1;
remove_spaces(tmp_raw_insn);
sscanf(tmp_raw_insn, "%x", &dl->raw.raw_insn);
if (objdump)
dl->raw.raw_insn = be32_to_cpu(dl->raw.raw_insn);
return 0;
}
static void annotation_line__init(struct annotation_line *al,
struct annotate_args *args,
int nr)
{
al->offset = args->offset;
al->line = strdup(args->line);
al->line_nr = args->line_nr;
al->fileloc = args->fileloc;
al->data_nr = nr;
}
static void annotation_line__exit(struct annotation_line *al)
{
zfree_srcline(&al->path);
zfree(&al->line);
zfree(&al->cycles);
zfree(&al->br_cntr);
}
static size_t disasm_line_size(int nr)
{
struct annotation_line *al;
return (sizeof(struct disasm_line) + (sizeof(al->data[0]) * nr));
}
/*
* Allocating the disasm annotation line data with
* following structure:
*
* -------------------------------------------
* struct disasm_line | struct annotation_line
* -------------------------------------------
*
* We have 'struct annotation_line' member as last member
* of 'struct disasm_line' to have an easy access.
*/
struct disasm_line *disasm_line__new(struct annotate_args *args)
{
struct disasm_line *dl = NULL;
struct annotation *notes = symbol__annotation(args->ms.sym);
int nr = notes->src->nr_events;
dl = zalloc(disasm_line_size(nr));
if (!dl)
return NULL;
annotation_line__init(&dl->al, args, nr);
if (dl->al.line == NULL)
goto out_delete;
if (args->offset != -1) {
if (arch__is(args->arch, "powerpc")) {
if (disasm_line__parse_powerpc(dl) < 0)
goto out_free_line;
} else if (disasm_line__parse(dl->al.line, &dl->ins.name, &dl->ops.raw) < 0)
goto out_free_line;
disasm_line__init_ins(dl, args->arch, &args->ms);
}
return dl;
out_free_line:
zfree(&dl->al.line);
out_delete:
free(dl);
return NULL;
}
void disasm_line__free(struct disasm_line *dl)
{
if (dl->ins.ops && dl->ins.ops->free)
dl->ins.ops->free(&dl->ops);
else
ins_ops__delete(&dl->ops);
zfree(&dl->ins.name);
annotation_line__exit(&dl->al);
free(dl);
}
int disasm_line__scnprintf(struct disasm_line *dl, char *bf, size_t size, bool raw, int max_ins_name)
{
if (raw || !dl->ins.ops)
return scnprintf(bf, size, "%-*s %s", max_ins_name, dl->ins.name, dl->ops.raw);
return ins__scnprintf(&dl->ins, bf, size, &dl->ops, max_ins_name);
}
/*
* symbol__parse_objdump_line() parses objdump output (with -d --no-show-raw)
* which looks like following
*
* 0000000000415500 <_init>:
* 415500: sub $0x8,%rsp
* 415504: mov 0x2f5ad5(%rip),%rax # 70afe0 <_DYNAMIC+0x2f8>
* 41550b: test %rax,%rax
* 41550e: je 415515 <_init+0x15>
* 415510: callq 416e70 <__gmon_start__@plt>
* 415515: add $0x8,%rsp
* 415519: retq
*
* it will be parsed and saved into struct disasm_line as
* <offset> <name> <ops.raw>
*
* The offset will be a relative offset from the start of the symbol and -1
* means that it's not a disassembly line so should be treated differently.
* The ops.raw part will be parsed further according to type of the instruction.
*/
static int symbol__parse_objdump_line(struct symbol *sym,
struct annotate_args *args,
char *parsed_line, int *line_nr, char **fileloc)
{
struct map *map = args->ms.map;
struct annotation *notes = symbol__annotation(sym);
struct disasm_line *dl;
char *tmp;
s64 line_ip, offset = -1;
regmatch_t match[2];
/* /filename:linenr ? Save line number and ignore. */
if (regexec(&file_lineno, parsed_line, 2, match, 0) == 0) {
*line_nr = atoi(parsed_line + match[1].rm_so);
free(*fileloc);
*fileloc = strdup(parsed_line);
return 0;
}
/* Process hex address followed by ':'. */
line_ip = strtoull(parsed_line, &tmp, 16);
if (parsed_line != tmp && tmp[0] == ':' && tmp[1] != '\0') {
u64 start = map__rip_2objdump(map, sym->start),
end = map__rip_2objdump(map, sym->end);
offset = line_ip - start;
if ((u64)line_ip < start || (u64)line_ip >= end)
offset = -1;
else
parsed_line = tmp + 1;
}
args->offset = offset;
args->line = parsed_line;
args->line_nr = *line_nr;
args->fileloc = *fileloc;
args->ms.sym = sym;
dl = disasm_line__new(args);
(*line_nr)++;
if (dl == NULL)
return -1;
if (!disasm_line__has_local_offset(dl)) {
dl->ops.target.offset = dl->ops.target.addr -
map__rip_2objdump(map, sym->start);
dl->ops.target.offset_avail = true;
}
/* kcore has no symbols, so add the call target symbol */
if (dl->ins.ops && ins__is_call(&dl->ins) && !dl->ops.target.sym) {
struct addr_map_symbol target = {
.addr = dl->ops.target.addr,
.ms = { .map = map, },
};
if (!maps__find_ams(args->ms.maps, &target) &&
target.ms.sym->start == target.al_addr)
dl->ops.target.sym = target.ms.sym;
}
annotation_line__add(&dl->al, &notes->src->source);
return 0;
}
static void delete_last_nop(struct symbol *sym)
{
struct annotation *notes = symbol__annotation(sym);
struct list_head *list = &notes->src->source;
struct disasm_line *dl;
while (!list_empty(list)) {
dl = list_entry(list->prev, struct disasm_line, al.node);
if (dl->ins.ops) {
if (!ins__is_nop(&dl->ins))
return;
} else {
if (!strstr(dl->al.line, " nop ") &&
!strstr(dl->al.line, " nopl ") &&
!strstr(dl->al.line, " nopw "))
return;
}
list_del_init(&dl->al.node);
disasm_line__free(dl);
}
}
int symbol__strerror_disassemble(struct map_symbol *ms, int errnum, char *buf, size_t buflen)
{
struct dso *dso = map__dso(ms->map);
BUG_ON(buflen == 0);
if (errnum >= 0) {
str_error_r(errnum, buf, buflen);
return 0;
}
switch (errnum) {
case SYMBOL_ANNOTATE_ERRNO__NO_VMLINUX: {
char bf[SBUILD_ID_SIZE + 15] = " with build id ";
char *build_id_msg = NULL;
if (dso__has_build_id(dso)) {
build_id__sprintf(dso__bid(dso), bf + 15);
build_id_msg = bf;
}
scnprintf(buf, buflen,
"No vmlinux file%s\nwas found in the path.\n\n"
"Note that annotation using /proc/kcore requires CAP_SYS_RAWIO capability.\n\n"
"Please use:\n\n"
" perf buildid-cache -vu vmlinux\n\n"
"or:\n\n"
" --vmlinux vmlinux\n", build_id_msg ?: "");
}
break;
case SYMBOL_ANNOTATE_ERRNO__NO_LIBOPCODES_FOR_BPF:
scnprintf(buf, buflen, "Please link with binutils's libopcode to enable BPF annotation");
break;
case SYMBOL_ANNOTATE_ERRNO__ARCH_INIT_REGEXP:
scnprintf(buf, buflen, "Problems with arch specific instruction name regular expressions.");
break;
case SYMBOL_ANNOTATE_ERRNO__ARCH_INIT_CPUID_PARSING:
scnprintf(buf, buflen, "Problems while parsing the CPUID in the arch specific initialization.");
break;
case SYMBOL_ANNOTATE_ERRNO__BPF_INVALID_FILE:
scnprintf(buf, buflen, "Invalid BPF file: %s.", dso__long_name(dso));
break;
case SYMBOL_ANNOTATE_ERRNO__BPF_MISSING_BTF:
scnprintf(buf, buflen, "The %s BPF file has no BTF section, compile with -g or use pahole -J.",
dso__long_name(dso));
break;
default:
scnprintf(buf, buflen, "Internal error: Invalid %d error code\n", errnum);
break;
}
return 0;
}
static int dso__disassemble_filename(struct dso *dso, char *filename, size_t filename_size)
{
char linkname[PATH_MAX];
char *build_id_filename;
char *build_id_path = NULL;
char *pos;
int len;
if (dso__symtab_type(dso) == DSO_BINARY_TYPE__KALLSYMS &&
!dso__is_kcore(dso))
return SYMBOL_ANNOTATE_ERRNO__NO_VMLINUX;
build_id_filename = dso__build_id_filename(dso, NULL, 0, false);
if (build_id_filename) {
__symbol__join_symfs(filename, filename_size, build_id_filename);
free(build_id_filename);
} else {
if (dso__has_build_id(dso))
return ENOMEM;
goto fallback;
}
build_id_path = strdup(filename);
if (!build_id_path)
return ENOMEM;
/*
* old style build-id cache has name of XX/XXXXXXX.. while
* new style has XX/XXXXXXX../{elf,kallsyms,vdso}.
* extract the build-id part of dirname in the new style only.
*/
pos = strrchr(build_id_path, '/');
if (pos && strlen(pos) < SBUILD_ID_SIZE - 2)
dirname(build_id_path);
if (dso__is_kcore(dso))
goto fallback;
len = readlink(build_id_path, linkname, sizeof(linkname) - 1);
if (len < 0)
goto fallback;
linkname[len] = '\0';
if (strstr(linkname, DSO__NAME_KALLSYMS) ||
access(filename, R_OK)) {
fallback:
/*
* If we don't have build-ids or the build-id file isn't in the
* cache, or is just a kallsyms file, well, lets hope that this
* DSO is the same as when 'perf record' ran.
*/
if (dso__kernel(dso) && dso__long_name(dso)[0] == '/')
snprintf(filename, filename_size, "%s", dso__long_name(dso));
else
__symbol__join_symfs(filename, filename_size, dso__long_name(dso));
mutex_lock(dso__lock(dso));
if (access(filename, R_OK) && errno == ENOENT && dso__nsinfo(dso)) {
char *new_name = dso__filename_with_chroot(dso, filename);
if (new_name) {
strlcpy(filename, new_name, filename_size);
free(new_name);
}
}
mutex_unlock(dso__lock(dso));
} else if (dso__binary_type(dso) == DSO_BINARY_TYPE__NOT_FOUND) {
dso__set_binary_type(dso, DSO_BINARY_TYPE__BUILD_ID_CACHE);
}
free(build_id_path);
return 0;
}
#ifdef HAVE_LIBCAPSTONE_SUPPORT
#include <capstone/capstone.h>
int capstone_init(struct machine *machine, csh *cs_handle, bool is64, bool disassembler_style);
static int open_capstone_handle(struct annotate_args *args, bool is_64bit,
csh *handle)
{
struct annotation_options *opt = args->options;
cs_mode mode = is_64bit ? CS_MODE_64 : CS_MODE_32;
/* TODO: support more architectures */
if (!arch__is(args->arch, "x86"))
return -1;
if (cs_open(CS_ARCH_X86, mode, handle) != CS_ERR_OK)
return -1;
if (!opt->disassembler_style ||
!strcmp(opt->disassembler_style, "att"))
cs_option(*handle, CS_OPT_SYNTAX, CS_OPT_SYNTAX_ATT);
/*
* Resolving address operands to symbols is implemented
* on x86 by investigating instruction details.
*/
cs_option(*handle, CS_OPT_DETAIL, CS_OPT_ON);
return 0;
}
#endif
#if defined(HAVE_LIBCAPSTONE_SUPPORT) || defined(HAVE_LIBLLVM_SUPPORT)
struct find_file_offset_data {
u64 ip;
u64 offset;
};
/* This will be called for each PHDR in an ELF binary */
static int find_file_offset(u64 start, u64 len, u64 pgoff, void *arg)
{
struct find_file_offset_data *data = arg;
if (start <= data->ip && data->ip < start + len) {
data->offset = pgoff + data->ip - start;
return 1;
}
return 0;
}
static u8 *
read_symbol(const char *filename, struct map *map, struct symbol *sym,
u64 *len, bool *is_64bit)
{
struct dso *dso = map__dso(map);
struct nscookie nsc;
u64 start = map__rip_2objdump(map, sym->start);
u64 end = map__rip_2objdump(map, sym->end);
int fd, count;
u8 *buf = NULL;
struct find_file_offset_data data = {
.ip = start,
};
*is_64bit = false;
nsinfo__mountns_enter(dso__nsinfo(dso), &nsc);
fd = open(filename, O_RDONLY);
nsinfo__mountns_exit(&nsc);
if (fd < 0)
return NULL;
if (file__read_maps(fd, /*exe=*/true, find_file_offset, &data,
is_64bit) == 0)
goto err;
*len = end - start;
buf = malloc(*len);
if (buf == NULL)
goto err;
count = pread(fd, buf, *len, data.offset);
close(fd);
fd = -1;
if ((u64)count != *len)
goto err;
return buf;
err:
if (fd >= 0)
close(fd);
free(buf);
return NULL;
}
#endif
#ifdef HAVE_LIBCAPSTONE_SUPPORT
static void print_capstone_detail(cs_insn *insn, char *buf, size_t len,
struct annotate_args *args, u64 addr)
{
int i;
struct map *map = args->ms.map;
struct symbol *sym;
/* TODO: support more architectures */
if (!arch__is(args->arch, "x86"))
return;
if (insn->detail == NULL)
return;
for (i = 0; i < insn->detail->x86.op_count; i++) {
cs_x86_op *op = &insn->detail->x86.operands[i];
u64 orig_addr;
if (op->type != X86_OP_MEM)
continue;
/* only print RIP-based global symbols for now */
if (op->mem.base != X86_REG_RIP)
continue;
/* get the target address */
orig_addr = addr + insn->size + op->mem.disp;
addr = map__objdump_2mem(map, orig_addr);
if (dso__kernel(map__dso(map))) {
/*
* The kernel maps can be splitted into sections,
* let's find the map first and the search the symbol.
*/
map = maps__find(map__kmaps(map), addr);
if (map == NULL)
continue;
}
/* convert it to map-relative address for search */
addr = map__map_ip(map, addr);
sym = map__find_symbol(map, addr);
if (sym == NULL)
continue;
if (addr == sym->start) {
scnprintf(buf, len, "\t# %"PRIx64" <%s>",
orig_addr, sym->name);
} else {
scnprintf(buf, len, "\t# %"PRIx64" <%s+%#"PRIx64">",
orig_addr, sym->name, addr - sym->start);
}
break;
}
}
static int symbol__disassemble_capstone_powerpc(char *filename, struct symbol *sym,
struct annotate_args *args)
{
struct annotation *notes = symbol__annotation(sym);
struct map *map = args->ms.map;
struct dso *dso = map__dso(map);
struct nscookie nsc;
u64 start = map__rip_2objdump(map, sym->start);
u64 end = map__rip_2objdump(map, sym->end);
u64 len = end - start;
u64 offset;
int i, fd, count;
bool is_64bit = false;
bool needs_cs_close = false;
u8 *buf = NULL;
struct find_file_offset_data data = {
.ip = start,
};
csh handle;
char disasm_buf[512];
struct disasm_line *dl;
u32 *line;
bool disassembler_style = false;
if (args->options->objdump_path)
return -1;
nsinfo__mountns_enter(dso__nsinfo(dso), &nsc);
fd = open(filename, O_RDONLY);
nsinfo__mountns_exit(&nsc);
if (fd < 0)
return -1;
if (file__read_maps(fd, /*exe=*/true, find_file_offset, &data,
&is_64bit) == 0)
goto err;
if (!args->options->disassembler_style ||
!strcmp(args->options->disassembler_style, "att"))
disassembler_style = true;
if (capstone_init(maps__machine(args->ms.maps), &handle, is_64bit, disassembler_style) < 0)
goto err;
needs_cs_close = true;
buf = malloc(len);
if (buf == NULL)
goto err;
count = pread(fd, buf, len, data.offset);
close(fd);
fd = -1;
if ((u64)count != len)
goto err;
line = (u32 *)buf;
/* add the function address and name */
scnprintf(disasm_buf, sizeof(disasm_buf), "%#"PRIx64" <%s>:",
start, sym->name);
args->offset = -1;
args->line = disasm_buf;
args->line_nr = 0;
args->fileloc = NULL;
args->ms.sym = sym;
dl = disasm_line__new(args);
if (dl == NULL)
goto err;
annotation_line__add(&dl->al, &notes->src->source);
/*
* TODO: enable disassm for powerpc
* count = cs_disasm(handle, buf, len, start, len, &insn);
*
* For now, only binary code is saved in disassembled line
* to be used in "type" and "typeoff" sort keys. Each raw code
* is 32 bit instruction. So use "len/4" to get the number of
* entries.
*/
count = len/4;
for (i = 0, offset = 0; i < count; i++) {
args->offset = offset;
sprintf(args->line, "%x", line[i]);
dl = disasm_line__new(args);
if (dl == NULL)
goto err;
annotation_line__add(&dl->al, &notes->src->source);
offset += 4;
}
/* It failed in the middle */
if (offset != len) {
struct list_head *list = &notes->src->source;
/* Discard all lines and fallback to objdump */
while (!list_empty(list)) {
dl = list_first_entry(list, struct disasm_line, al.node);
list_del_init(&dl->al.node);
disasm_line__free(dl);
}
count = -1;
}
out:
if (needs_cs_close)
cs_close(&handle);
free(buf);
return count < 0 ? count : 0;
err:
if (fd >= 0)
close(fd);
if (needs_cs_close) {
struct disasm_line *tmp;
/*
* It probably failed in the middle of the above loop.
* Release any resources it might add.
*/
list_for_each_entry_safe(dl, tmp, &notes->src->source, al.node) {
list_del(&dl->al.node);
free(dl);
}
}
count = -1;
goto out;
}
static int symbol__disassemble_capstone(char *filename, struct symbol *sym,
struct annotate_args *args)
{
struct annotation *notes = symbol__annotation(sym);
struct map *map = args->ms.map;
u64 start = map__rip_2objdump(map, sym->start);
u64 len;
u64 offset;
int i, count;
bool is_64bit = false;
bool needs_cs_close = false;
u8 *buf = NULL;
csh handle;
cs_insn *insn;
char disasm_buf[512];
struct disasm_line *dl;
if (args->options->objdump_path)
return -1;
buf = read_symbol(filename, map, sym, &len, &is_64bit);
if (buf == NULL)
return -1;
/* add the function address and name */
scnprintf(disasm_buf, sizeof(disasm_buf), "%#"PRIx64" <%s>:",
start, sym->name);
args->offset = -1;
args->line = disasm_buf;
args->line_nr = 0;
args->fileloc = NULL;
args->ms.sym = sym;
dl = disasm_line__new(args);
if (dl == NULL)
goto err;
annotation_line__add(&dl->al, &notes->src->source);
if (open_capstone_handle(args, is_64bit, &handle) < 0)
goto err;
needs_cs_close = true;
count = cs_disasm(handle, buf, len, start, len, &insn);
for (i = 0, offset = 0; i < count; i++) {
int printed;
printed = scnprintf(disasm_buf, sizeof(disasm_buf),
" %-7s %s",
insn[i].mnemonic, insn[i].op_str);
print_capstone_detail(&insn[i], disasm_buf + printed,
sizeof(disasm_buf) - printed, args,
start + offset);
args->offset = offset;
args->line = disasm_buf;
dl = disasm_line__new(args);
if (dl == NULL)
goto err;
annotation_line__add(&dl->al, &notes->src->source);
offset += insn[i].size;
}
/* It failed in the middle: probably due to unknown instructions */
if (offset != len) {
struct list_head *list = &notes->src->source;
/* Discard all lines and fallback to objdump */
while (!list_empty(list)) {
dl = list_first_entry(list, struct disasm_line, al.node);
list_del_init(&dl->al.node);
disasm_line__free(dl);
}
count = -1;
}
out:
if (needs_cs_close)
cs_close(&handle);
free(buf);
return count < 0 ? count : 0;
err:
if (needs_cs_close) {
struct disasm_line *tmp;
/*
* It probably failed in the middle of the above loop.
* Release any resources it might add.
*/
list_for_each_entry_safe(dl, tmp, &notes->src->source, al.node) {
list_del(&dl->al.node);
free(dl);
}
}
count = -1;
goto out;
}
#endif
static int symbol__disassemble_raw(char *filename, struct symbol *sym,
struct annotate_args *args)
{
struct annotation *notes = symbol__annotation(sym);
struct map *map = args->ms.map;
struct dso *dso = map__dso(map);
u64 start = map__rip_2objdump(map, sym->start);
u64 end = map__rip_2objdump(map, sym->end);
u64 len = end - start;
u64 offset;
int i, count;
u8 *buf = NULL;
char disasm_buf[512];
struct disasm_line *dl;
u32 *line;
/* Return if objdump is specified explicitly */
if (args->options->objdump_path)
return -1;
pr_debug("Reading raw instruction from : %s using dso__data_read_offset\n", filename);
buf = malloc(len);
if (buf == NULL)
goto err;
count = dso__data_read_offset(dso, NULL, sym->start, buf, len);
line = (u32 *)buf;
if ((u64)count != len)
goto err;
/* add the function address and name */
scnprintf(disasm_buf, sizeof(disasm_buf), "%#"PRIx64" <%s>:",
start, sym->name);
args->offset = -1;
args->line = disasm_buf;
args->line_nr = 0;
args->fileloc = NULL;
args->ms.sym = sym;
dl = disasm_line__new(args);
if (dl == NULL)
goto err;
annotation_line__add(&dl->al, &notes->src->source);
/* Each raw instruction is 4 byte */
count = len/4;
for (i = 0, offset = 0; i < count; i++) {
args->offset = offset;
sprintf(args->line, "%x", line[i]);
dl = disasm_line__new(args);
if (dl == NULL)
goto err;
annotation_line__add(&dl->al, &notes->src->source);
offset += 4;
}
/* It failed in the middle */
if (offset != len) {
struct list_head *list = &notes->src->source;
/* Discard all lines and fallback to objdump */
while (!list_empty(list)) {
dl = list_first_entry(list, struct disasm_line, al.node);
list_del_init(&dl->al.node);
disasm_line__free(dl);
}
count = -1;
}
out:
free(buf);
return count < 0 ? count : 0;
err:
count = -1;
goto out;
}
#ifdef HAVE_LIBLLVM_SUPPORT
#include <llvm-c/Disassembler.h>
#include <llvm-c/Target.h>
#include "util/llvm-c-helpers.h"
struct symbol_lookup_storage {
u64 branch_addr;
u64 pcrel_load_addr;
};
/*
* Whenever LLVM wants to resolve an address into a symbol, it calls this
* callback. We don't ever actually _return_ anything (in particular, because
* it puts quotation marks around what we return), but we use this as a hint
* that there is a branch or PC-relative address in the expression that we
* should add some textual annotation for after the instruction. The caller
* will use this information to add the actual annotation.
*/
static const char *
symbol_lookup_callback(void *disinfo, uint64_t value,
uint64_t *ref_type,
uint64_t address __maybe_unused,
const char **ref __maybe_unused)
{
struct symbol_lookup_storage *storage = disinfo;
if (*ref_type == LLVMDisassembler_ReferenceType_In_Branch)
storage->branch_addr = value;
else if (*ref_type == LLVMDisassembler_ReferenceType_In_PCrel_Load)
storage->pcrel_load_addr = value;
*ref_type = LLVMDisassembler_ReferenceType_InOut_None;
return NULL;
}
static int symbol__disassemble_llvm(char *filename, struct symbol *sym,
struct annotate_args *args)
{
struct annotation *notes = symbol__annotation(sym);
struct map *map = args->ms.map;
struct dso *dso = map__dso(map);
u64 start = map__rip_2objdump(map, sym->start);
u8 *buf;
u64 len;
u64 pc;
bool is_64bit;
char triplet[64];
char disasm_buf[2048];
size_t disasm_len;
struct disasm_line *dl;
LLVMDisasmContextRef disasm = NULL;
struct symbol_lookup_storage storage;
char *line_storage = NULL;
size_t line_storage_len = 0;
int ret = -1;
if (args->options->objdump_path)
return -1;
LLVMInitializeAllTargetInfos();
LLVMInitializeAllTargetMCs();
LLVMInitializeAllDisassemblers();
buf = read_symbol(filename, map, sym, &len, &is_64bit);
if (buf == NULL)
return -1;
if (arch__is(args->arch, "x86")) {
if (is_64bit)
scnprintf(triplet, sizeof(triplet), "x86_64-pc-linux");
else
scnprintf(triplet, sizeof(triplet), "i686-pc-linux");
} else {
scnprintf(triplet, sizeof(triplet), "%s-linux-gnu",
args->arch->name);
}
disasm = LLVMCreateDisasm(triplet, &storage, 0, NULL,
symbol_lookup_callback);
if (disasm == NULL)
goto err;
if (args->options->disassembler_style &&
!strcmp(args->options->disassembler_style, "intel"))
LLVMSetDisasmOptions(disasm,
LLVMDisassembler_Option_AsmPrinterVariant);
/*
* This needs to be set after AsmPrinterVariant, due to a bug in LLVM;
* setting AsmPrinterVariant makes a new instruction printer, making it
* forget about the PrintImmHex flag (which is applied before if both
* are given to the same call).
*/
LLVMSetDisasmOptions(disasm, LLVMDisassembler_Option_PrintImmHex);
/* add the function address and name */
scnprintf(disasm_buf, sizeof(disasm_buf), "%#"PRIx64" <%s>:",
start, sym->name);
args->offset = -1;
args->line = disasm_buf;
args->line_nr = 0;
args->fileloc = NULL;
args->ms.sym = sym;
dl = disasm_line__new(args);
if (dl == NULL)
goto err;
annotation_line__add(&dl->al, &notes->src->source);
pc = start;
for (u64 offset = 0; offset < len; ) {
unsigned int ins_len;
storage.branch_addr = 0;
storage.pcrel_load_addr = 0;
ins_len = LLVMDisasmInstruction(disasm, buf + offset,
len - offset, pc,
disasm_buf, sizeof(disasm_buf));
if (ins_len == 0)
goto err;
disasm_len = strlen(disasm_buf);
if (storage.branch_addr != 0) {
char *name = llvm_name_for_code(dso, filename,
storage.branch_addr);
if (name != NULL) {
disasm_len += scnprintf(disasm_buf + disasm_len,
sizeof(disasm_buf) -
disasm_len,
" <%s>", name);
free(name);
}
}
if (storage.pcrel_load_addr != 0) {
char *name = llvm_name_for_data(dso, filename,
storage.pcrel_load_addr);
disasm_len += scnprintf(disasm_buf + disasm_len,
sizeof(disasm_buf) - disasm_len,
" # %#"PRIx64,
storage.pcrel_load_addr);
if (name) {
disasm_len += scnprintf(disasm_buf + disasm_len,
sizeof(disasm_buf) -
disasm_len,
" <%s>", name);
free(name);
}
}
args->offset = offset;
args->line = expand_tabs(disasm_buf, &line_storage,
&line_storage_len);
args->line_nr = 0;
args->fileloc = NULL;
args->ms.sym = sym;
llvm_addr2line(filename, pc, &args->fileloc,
(unsigned int *)&args->line_nr, false, NULL);
dl = disasm_line__new(args);
if (dl == NULL)
goto err;
annotation_line__add(&dl->al, &notes->src->source);
free(args->fileloc);
pc += ins_len;
offset += ins_len;
}
ret = 0;
err:
LLVMDisasmDispose(disasm);
free(buf);
free(line_storage);
return ret;
}
#endif
/*
* Possibly create a new version of line with tabs expanded. Returns the
* existing or new line, storage is updated if a new line is allocated. If
* allocation fails then NULL is returned.
*/
static char *expand_tabs(char *line, char **storage, size_t *storage_len)
{
size_t i, src, dst, len, new_storage_len, num_tabs;
char *new_line;
size_t line_len = strlen(line);
for (num_tabs = 0, i = 0; i < line_len; i++)
if (line[i] == '\t')
num_tabs++;
if (num_tabs == 0)
return line;
/*
* Space for the line and '\0', less the leading and trailing
* spaces. Each tab may introduce 7 additional spaces.
*/
new_storage_len = line_len + 1 + (num_tabs * 7);
new_line = malloc(new_storage_len);
if (new_line == NULL) {
pr_err("Failure allocating memory for tab expansion\n");
return NULL;
}
/*
* Copy regions starting at src and expand tabs. If there are two
* adjacent tabs then 'src == i', the memcpy is of size 0 and the spaces
* are inserted.
*/
for (i = 0, src = 0, dst = 0; i < line_len && num_tabs; i++) {
if (line[i] == '\t') {
len = i - src;
memcpy(&new_line[dst], &line[src], len);
dst += len;
new_line[dst++] = ' ';
while (dst % 8 != 0)
new_line[dst++] = ' ';
src = i + 1;
num_tabs--;
}
}
/* Expand the last region. */
len = line_len - src;
memcpy(&new_line[dst], &line[src], len);
dst += len;
new_line[dst] = '\0';
free(*storage);
*storage = new_line;
*storage_len = new_storage_len;
return new_line;
}
int symbol__disassemble(struct symbol *sym, struct annotate_args *args)
{
struct annotation_options *opts = &annotate_opts;
struct map *map = args->ms.map;
struct dso *dso = map__dso(map);
char *command;
FILE *file;
char symfs_filename[PATH_MAX];
struct kcore_extract kce;
bool delete_extract = false;
bool decomp = false;
int lineno = 0;
char *fileloc = NULL;
int nline;
char *line;
size_t line_len;
const char *objdump_argv[] = {
"/bin/sh",
"-c",
NULL, /* Will be the objdump command to run. */
"--",
NULL, /* Will be the symfs path. */
NULL,
};
struct child_process objdump_process;
int err = dso__disassemble_filename(dso, symfs_filename, sizeof(symfs_filename));
if (err)
return err;
pr_debug("%s: filename=%s, sym=%s, start=%#" PRIx64 ", end=%#" PRIx64 "\n", __func__,
symfs_filename, sym->name, map__unmap_ip(map, sym->start),
map__unmap_ip(map, sym->end));
pr_debug("annotating [%p] %30s : [%p] %30s\n",
dso, dso__long_name(dso), sym, sym->name);
if (dso__binary_type(dso) == DSO_BINARY_TYPE__BPF_PROG_INFO) {
return symbol__disassemble_bpf(sym, args);
} else if (dso__binary_type(dso) == DSO_BINARY_TYPE__BPF_IMAGE) {
return symbol__disassemble_bpf_image(sym, args);
} else if (dso__binary_type(dso) == DSO_BINARY_TYPE__NOT_FOUND) {
return -1;
} else if (dso__is_kcore(dso)) {
kce.kcore_filename = symfs_filename;
kce.addr = map__rip_2objdump(map, sym->start);
kce.offs = sym->start;
kce.len = sym->end - sym->start;
if (!kcore_extract__create(&kce)) {
delete_extract = true;
strlcpy(symfs_filename, kce.extract_filename,
sizeof(symfs_filename));
}
} else if (dso__needs_decompress(dso)) {
char tmp[KMOD_DECOMP_LEN];
if (dso__decompress_kmodule_path(dso, symfs_filename,
tmp, sizeof(tmp)) < 0)
return -1;
decomp = true;
strcpy(symfs_filename, tmp);
}
/*
* For powerpc data type profiling, use the dso__data_read_offset
* to read raw instruction directly and interpret the binary code
* to understand instructions and register fields. For sort keys as
* type and typeoff, disassemble to mnemonic notation is
* not required in case of powerpc.
*/
if (arch__is(args->arch, "powerpc")) {
extern const char *sort_order;
if (sort_order && !strstr(sort_order, "sym")) {
err = symbol__disassemble_raw(symfs_filename, sym, args);
if (err == 0)
goto out_remove_tmp;
#ifdef HAVE_LIBCAPSTONE_SUPPORT
err = symbol__disassemble_capstone_powerpc(symfs_filename, sym, args);
if (err == 0)
goto out_remove_tmp;
#endif
}
}
#ifdef HAVE_LIBLLVM_SUPPORT
err = symbol__disassemble_llvm(symfs_filename, sym, args);
if (err == 0)
goto out_remove_tmp;
#endif
#ifdef HAVE_LIBCAPSTONE_SUPPORT
err = symbol__disassemble_capstone(symfs_filename, sym, args);
if (err == 0)
goto out_remove_tmp;
#endif
err = asprintf(&command,
"%s %s%s --start-address=0x%016" PRIx64
" --stop-address=0x%016" PRIx64
" %s -d %s %s %s %c%s%c %s%s -C \"$1\"",
opts->objdump_path ?: "objdump",
opts->disassembler_style ? "-M " : "",
opts->disassembler_style ?: "",
map__rip_2objdump(map, sym->start),
map__rip_2objdump(map, sym->end),
opts->show_linenr ? "-l" : "",
opts->show_asm_raw ? "" : "--no-show-raw-insn",
opts->annotate_src ? "-S" : "",
opts->prefix ? "--prefix " : "",
opts->prefix ? '"' : ' ',
opts->prefix ?: "",
opts->prefix ? '"' : ' ',
opts->prefix_strip ? "--prefix-strip=" : "",
opts->prefix_strip ?: "");
if (err < 0) {
pr_err("Failure allocating memory for the command to run\n");
goto out_remove_tmp;
}
pr_debug("Executing: %s\n", command);
objdump_argv[2] = command;
objdump_argv[4] = symfs_filename;
/* Create a pipe to read from for stdout */
memset(&objdump_process, 0, sizeof(objdump_process));
objdump_process.argv = objdump_argv;
objdump_process.out = -1;
objdump_process.err = -1;
objdump_process.no_stderr = 1;
if (start_command(&objdump_process)) {
pr_err("Failure starting to run %s\n", command);
err = -1;
goto out_free_command;
}
file = fdopen(objdump_process.out, "r");
if (!file) {
pr_err("Failure creating FILE stream for %s\n", command);
/*
* If we were using debug info should retry with
* original binary.
*/
err = -1;
goto out_close_stdout;
}
/* Storage for getline. */
line = NULL;
line_len = 0;
nline = 0;
while (!feof(file)) {
const char *match;
char *expanded_line;
if (getline(&line, &line_len, file) < 0 || !line)
break;
/* Skip lines containing "filename:" */
match = strstr(line, symfs_filename);
if (match && match[strlen(symfs_filename)] == ':')
continue;
expanded_line = strim(line);
expanded_line = expand_tabs(expanded_line, &line, &line_len);
if (!expanded_line)
break;
/*
* The source code line number (lineno) needs to be kept in
* across calls to symbol__parse_objdump_line(), so that it
* can associate it with the instructions till the next one.
* See disasm_line__new() and struct disasm_line::line_nr.
*/
if (symbol__parse_objdump_line(sym, args, expanded_line,
&lineno, &fileloc) < 0)
break;
nline++;
}
free(line);
free(fileloc);
err = finish_command(&objdump_process);
if (err)
pr_err("Error running %s\n", command);
if (nline == 0) {
err = -1;
pr_err("No output from %s\n", command);
}
/*
* kallsyms does not have symbol sizes so there may a nop at the end.
* Remove it.
*/
if (dso__is_kcore(dso))
delete_last_nop(sym);
fclose(file);
out_close_stdout:
close(objdump_process.out);
out_free_command:
free(command);
out_remove_tmp:
if (decomp)
unlink(symfs_filename);
if (delete_extract)
kcore_extract__delete(&kce);
return err;
}
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