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| author |   Julien Thierry <jthierry@redhat.com> | 2020-03-27 15:28:47 +0000 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2020-04-22 10:53:50 +0200 |
| commit | 65ea47dcf4f936987a5fbf839c97acea00f4f196 (patch) | |
| tree | bc960fe0d080dea37cb653326acaa47051ebdeba /tools/objtool/arch | |
| parent | objtool: Remove redundant .rodata section name comparison (diff) | |
| download | linux-dev-65ea47dcf4f936987a5fbf839c97acea00f4f196.tar.xz linux-dev-65ea47dcf4f936987a5fbf839c97acea00f4f196.zip | |
objtool: Support multiple stack_op per instruction
Instruction sets can include more or less complex operations which might
not fit the currently defined set of stack_ops.
Combining more than one stack_op provides more flexibility to describe
the behaviour of an instruction. This also reduces the need to define
new stack_ops specific to a single instruction set.
Allow instruction decoders to generate multiple stack_op per
instruction.
Signed-off-by: Julien Thierry <jthierry@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20200327152847.15294-11-jthierry@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/objtool/arch')
| -rw-r--r-- | tools/objtool/arch/x86/decode.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c index 7ce8650cf085..199b4084a13c 100644 --- a/tools/objtool/arch/x86/decode.c +++ b/tools/objtool/arch/x86/decode.c @@ -80,13 +80,15 @@ unsigned long arch_jump_destination(struct instruction *insn) int arch_decode_instruction(struct elf *elf, struct section *sec, unsigned long offset, unsigned int maxlen, unsigned int *len, enum insn_type *type, - unsigned long *immediate, struct stack_op *op) + unsigned long *immediate, + struct list_head *ops_list) { struct insn insn; int x86_64, sign; unsigned char op1, op2, rex = 0, rex_b = 0, rex_r = 0, rex_w = 0, rex_x = 0, modrm = 0, modrm_mod = 0, modrm_rm = 0, modrm_reg = 0, sib = 0; + struct stack_op *op; x86_64 = is_x86_64(elf); if (x86_64 == -1) @@ -127,6 +129,10 @@ int arch_decode_instruction(struct elf *elf, struct section *sec, if (insn.sib.nbytes) sib = insn.sib.bytes[0]; + op = calloc(1, sizeof(*op)); + if (!op) + return -1; + switch (op1) { case 0x1: @@ -488,6 +494,11 @@ int arch_decode_instruction(struct elf *elf, struct section *sec, *immediate = insn.immediate.nbytes ? insn.immediate.value : 0; + if (*type == INSN_STACK) + list_add_tail(&op->list, ops_list); + else + free(op); + return 0; } |