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objtool: Rework allocating stack_ops on decode 

Wrap each stack_op in a macro that allocates and adds it to the list.
This simplifies trying to figure out what to do with the pre-allocated
stack_op at the end.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20200428191659.736151601@infradead.org
This commit is contained in:
Peter Zijlstra 2020-04-23 13:22:10 +02:00
parent c721b3f80f
commit 7d989fcadd
1 changed files with 147 additions and 104 deletions
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251
tools/objtool/arch/x86/decode.c
View File

@ -77,6 +77,11 @@ unsigned long arch_jump_destination(struct instruction *insn)
return insn->offset + insn->len + insn->immediate;
}
#define ADD_OP(op) \
if (!(op = calloc(1, sizeof(*op)))) \
return -1; \
else for (list_add_tail(&op->list, ops_list); op; op = NULL)
int arch_decode_instruction(const struct elf *elf, const struct section *sec,
unsigned long offset, unsigned int maxlen,
unsigned int *len, enum insn_type *type,
@ -88,7 +93,7 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
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;
struct stack_op *op = NULL;
x86_64 = is_x86_64(elf);
if (x86_64 == -1)
@ -129,10 +134,6 @@ int arch_decode_instruction(const struct elf *elf, const 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:
@ -141,10 +142,12 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
/* add/sub reg, %rsp */
*type = INSN_STACK;
op->src.type = OP_SRC_ADD;
op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
op->dest.type = OP_DEST_REG;
op->dest.reg = CFI_SP;
ADD_OP(op) {
op->src.type = OP_SRC_ADD;
op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
op->dest.type = OP_DEST_REG;
op->dest.reg = CFI_SP;
}
}
break;
@ -152,9 +155,11 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
/* push reg */
*type = INSN_STACK;
op->src.type = OP_SRC_REG;
op->src.reg = op_to_cfi_reg[op1 & 0x7][rex_b];
op->dest.type = OP_DEST_PUSH;
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = op_to_cfi_reg[op1 & 0x7][rex_b];
op->dest.type = OP_DEST_PUSH;
}
break;
@ -162,9 +167,11 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
/* pop reg */
*type = INSN_STACK;
op->src.type = OP_SRC_POP;
op->dest.type = OP_DEST_REG;
op->dest.reg = op_to_cfi_reg[op1 & 0x7][rex_b];
ADD_OP(op) {
op->src.type = OP_SRC_POP;
op->dest.type = OP_DEST_REG;
op->dest.reg = op_to_cfi_reg[op1 & 0x7][rex_b];
}
break;
@ -172,8 +179,10 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
case 0x6a:
/* push immediate */
*type = INSN_STACK;
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSH;
ADD_OP(op) {
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSH;
}
break;
case 0x70 ... 0x7f:
@ -188,11 +197,13 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
if (modrm == 0xe4) {
/* and imm, %rsp */
*type = INSN_STACK;
op->src.type = OP_SRC_AND;
op->src.reg = CFI_SP;
op->src.offset = insn.immediate.value;
op->dest.type = OP_DEST_REG;
op->dest.reg = CFI_SP;
ADD_OP(op) {
op->src.type = OP_SRC_AND;
op->src.reg = CFI_SP;
op->src.offset = insn.immediate.value;
op->dest.type = OP_DEST_REG;
op->dest.reg = CFI_SP;
}
break;
}
@ -205,11 +216,13 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
/* add/sub imm, %rsp */
*type = INSN_STACK;
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_SP;
op->src.offset = insn.immediate.value * sign;
op->dest.type = OP_DEST_REG;
op->dest.reg = CFI_SP;
ADD_OP(op) {
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_SP;
op->src.offset = insn.immediate.value * sign;
op->dest.type = OP_DEST_REG;
op->dest.reg = CFI_SP;
}
break;
case 0x89:
@ -217,10 +230,12 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
/* mov %rsp, reg */
*type = INSN_STACK;
op->src.type = OP_SRC_REG;
op->src.reg = CFI_SP;
op->dest.type = OP_DEST_REG;
op->dest.reg = op_to_cfi_reg[modrm_rm][rex_b];
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = CFI_SP;
op->dest.type = OP_DEST_REG;
op->dest.reg = op_to_cfi_reg[modrm_rm][rex_b];
}
break;
}
@ -228,10 +243,12 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
/* mov reg, %rsp */
*type = INSN_STACK;
op->src.type = OP_SRC_REG;
op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
op->dest.type = OP_DEST_REG;
op->dest.reg = CFI_SP;
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
op->dest.type = OP_DEST_REG;
op->dest.reg = CFI_SP;
}
break;
}
@ -242,21 +259,25 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
/* mov reg, disp(%rbp) */
*type = INSN_STACK;
op->src.type = OP_SRC_REG;
op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
op->dest.type = OP_DEST_REG_INDIRECT;
op->dest.reg = CFI_BP;
op->dest.offset = insn.displacement.value;
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
op->dest.type = OP_DEST_REG_INDIRECT;
op->dest.reg = CFI_BP;
op->dest.offset = insn.displacement.value;
}
} else if (rex_w && !rex_b && modrm_rm == 4 && sib == 0x24) {
/* mov reg, disp(%rsp) */
*type = INSN_STACK;
op->src.type = OP_SRC_REG;
op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
op->dest.type = OP_DEST_REG_INDIRECT;
op->dest.reg = CFI_SP;
op->dest.offset = insn.displacement.value;
ADD_OP(op) {
op->src.type = OP_SRC_REG;
op->src.reg = op_to_cfi_reg[modrm_reg][rex_r];
op->dest.type = OP_DEST_REG_INDIRECT;
op->dest.reg = CFI_SP;
op->dest.offset = insn.displacement.value;
}
}
break;
@ -266,22 +287,26 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
/* mov disp(%rbp), reg */
*type = INSN_STACK;
op->src.type = OP_SRC_REG_INDIRECT;
op->src.reg = CFI_BP;
op->src.offset = insn.displacement.value;
op->dest.type = OP_DEST_REG;
op->dest.reg = op_to_cfi_reg[modrm_reg][rex_r];
ADD_OP(op) {
op->src.type = OP_SRC_REG_INDIRECT;
op->src.reg = CFI_BP;
op->src.offset = insn.displacement.value;
op->dest.type = OP_DEST_REG;
op->dest.reg = op_to_cfi_reg[modrm_reg][rex_r];
}
} else if (rex_w && !rex_b && sib == 0x24 &&
modrm_mod != 3 && modrm_rm == 4) {
/* mov disp(%rsp), reg */
*type = INSN_STACK;
op->src.type = OP_SRC_REG_INDIRECT;
op->src.reg = CFI_SP;
op->src.offset = insn.displacement.value;
op->dest.type = OP_DEST_REG;
op->dest.reg = op_to_cfi_reg[modrm_reg][rex_r];
ADD_OP(op) {
op->src.type = OP_SRC_REG_INDIRECT;
op->src.reg = CFI_SP;
op->src.offset = insn.displacement.value;
op->dest.type = OP_DEST_REG;
op->dest.reg = op_to_cfi_reg[modrm_reg][rex_r];
}
}
break;
@ -290,27 +315,31 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
if (sib == 0x24 && rex_w && !rex_b && !rex_x) {
*type = INSN_STACK;
if (!insn.displacement.value) {
/* lea (%rsp), reg */
op->src.type = OP_SRC_REG;
} else {
/* lea disp(%rsp), reg */
op->src.type = OP_SRC_ADD;
op->src.offset = insn.displacement.value;
ADD_OP(op) {
if (!insn.displacement.value) {
/* lea (%rsp), reg */
op->src.type = OP_SRC_REG;
} else {
/* lea disp(%rsp), reg */
op->src.type = OP_SRC_ADD;
op->src.offset = insn.displacement.value;
}
op->src.reg = CFI_SP;
op->dest.type = OP_DEST_REG;
op->dest.reg = op_to_cfi_reg[modrm_reg][rex_r];
}
op->src.reg = CFI_SP;
op->dest.type = OP_DEST_REG;
op->dest.reg = op_to_cfi_reg[modrm_reg][rex_r];
} else if (rex == 0x48 && modrm == 0x65) {
/* lea disp(%rbp), %rsp */
*type = INSN_STACK;
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_BP;
op->src.offset = insn.displacement.value;
op->dest.type = OP_DEST_REG;
op->dest.reg = CFI_SP;
ADD_OP(op) {
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_BP;
op->src.offset = insn.displacement.value;
op->dest.type = OP_DEST_REG;
op->dest.reg = CFI_SP;
}
} else if (rex == 0x49 && modrm == 0x62 &&
insn.displacement.value == -8) {
@ -322,11 +351,13 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
* stack realignment.
*/
*type = INSN_STACK;
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_R10;
op->src.offset = -8;
op->dest.type = OP_DEST_REG;
op->dest.reg = CFI_SP;
ADD_OP(op) {
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_R10;
op->src.offset = -8;
op->dest.type = OP_DEST_REG;
op->dest.reg = CFI_SP;
}
} else if (rex == 0x49 && modrm == 0x65 &&
insn.displacement.value == -16) {
@ -338,11 +369,13 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
* stack realignment.
*/
*type = INSN_STACK;
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_R13;
op->src.offset = -16;
op->dest.type = OP_DEST_REG;
op->dest.reg = CFI_SP;
ADD_OP(op) {
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_R13;
op->src.offset = -16;
op->dest.type = OP_DEST_REG;
op->dest.reg = CFI_SP;
}
}
break;
@ -350,8 +383,10 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
case 0x8f:
/* pop to mem */
*type = INSN_STACK;
op->src.type = OP_SRC_POP;
op->dest.type = OP_DEST_MEM;
ADD_OP(op) {
op->src.type = OP_SRC_POP;
op->dest.type = OP_DEST_MEM;
}
break;
case 0x90:
@ -361,15 +396,19 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
case 0x9c:
/* pushf */
*type = INSN_STACK;
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSHF;
ADD_OP(op) {
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSHF;
}
break;
case 0x9d:
/* popf */
*type = INSN_STACK;
op->src.type = OP_SRC_POPF;
op->dest.type = OP_DEST_MEM;
ADD_OP(op) {
op->src.type = OP_SRC_POPF;
op->dest.type = OP_DEST_MEM;
}
break;
case 0x0f:
@ -405,15 +444,19 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
/* push fs/gs */
*type = INSN_STACK;
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSH;
ADD_OP(op) {
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSH;
}
} else if (op2 == 0xa1 || op2 == 0xa9) {
/* pop fs/gs */
*type = INSN_STACK;
op->src.type = OP_SRC_POP;
op->dest.type = OP_DEST_MEM;
ADD_OP(op) {
op->src.type = OP_SRC_POP;
op->dest.type = OP_DEST_MEM;
}
}
break;
@ -427,7 +470,8 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
* pop bp
*/
*type = INSN_STACK;
op->dest.type = OP_DEST_LEAVE;
ADD_OP(op)
op->dest.type = OP_DEST_LEAVE;
break;
@ -449,12 +493,14 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
case 0xcf: /* iret */
*type = INSN_EXCEPTION_RETURN;
/* add $40, %rsp */
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_SP;
op->src.offset = 5*8;
op->dest.type = OP_DEST_REG;
op->dest.reg = CFI_SP;
ADD_OP(op) {
/* add $40, %rsp */
op->src.type = OP_SRC_ADD;
op->src.reg = CFI_SP;
op->src.offset = 5*8;
op->dest.type = OP_DEST_REG;
op->dest.reg = CFI_SP;
}
break;
case 0xca: /* retf */
@ -492,8 +538,10 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
/* push from mem */
*type = INSN_STACK;
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSH;
ADD_OP(op) {
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSH;
}
}
break;
@ -504,11 +552,6 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
*immediate = insn.immediate.nbytes ? insn.immediate.value : 0;
if (*type == INSN_STACK || *type == INSN_EXCEPTION_RETURN)
list_add_tail(&op->list, ops_list);
else
free(op);
return 0;
}