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objtool: Support multiple stack_op per instruction

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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>
This commit is contained in:
Julien Thierry
2020-03-27 15:28:47 +00:00
committed by Ingo Molnar
parent 1ee444700e
commit 65ea47dcf4
4 changed files with 62 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
tools/objtool/arch/x86/decode.c
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@@ -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;
}