From: Peter Zijlstra <peterz@infradead.org>
To: jpoimboe@redhat.com, alexandre.chartre@oracle.com
Cc: linux-kernel@vger.kernel.org, jthierry@redhat.com,
tglx@linutronix.de, x86@kernel.org, mbenes@suse.cz,
peterz@infradead.org
Subject: [PATCH 3/8] objtool: Rework allocating stack_ops on decode
Date: Thu, 23 Apr 2020 14:47:20 +0200 [thread overview]
Message-ID: <20200423125042.713052240@infradead.org> (raw)
In-Reply-To: 20200423125013.452964352@infradead.org
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>
---
tools/objtool/arch/x86/decode.c | 257 +++++++++++++++++++++++-----------------
1 file changed, 153 insertions(+), 104 deletions(-)
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -77,6 +77,17 @@ unsigned long arch_jump_destination(stru
return insn->offset + insn->len + insn->immediate;
}
+#define PUSH_OP(op) \
+({ \
+ list_add_tail(&op->list, ops_list); \
+ NULL; \
+})
+
+#define ADD_OP(op) \
+ if (!(op = calloc(1, sizeof(*op)))) \
+ return -1; \
+ else for (; op; op = PUSH_OP(op))
+
int arch_decode_instruction(struct elf *elf, struct section *sec,
unsigned long offset, unsigned int maxlen,
unsigned int *len, enum insn_type *type,
@@ -88,7 +99,7 @@ int arch_decode_instruction(struct elf *
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 +140,6 @@ int arch_decode_instruction(struct elf *
if (insn.sib.nbytes)
sib = insn.sib.bytes[0];
- op = calloc(1, sizeof(*op));
- if (!op)
- return -1;
-
switch (op1) {
case 0x1:
@@ -141,10 +148,12 @@ int arch_decode_instruction(struct elf *
/* 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 +161,11 @@ int arch_decode_instruction(struct elf *
/* 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 +173,11 @@ int arch_decode_instruction(struct elf *
/* 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 +185,10 @@ int arch_decode_instruction(struct elf *
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 +203,13 @@ int arch_decode_instruction(struct elf *
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 +222,13 @@ int arch_decode_instruction(struct elf *
/* 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 +236,12 @@ int arch_decode_instruction(struct elf *
/* 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 +249,12 @@ int arch_decode_instruction(struct elf *
/* 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 +265,25 @@ int arch_decode_instruction(struct elf *
/* 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 +293,26 @@ int arch_decode_instruction(struct elf *
/* 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 +321,31 @@ int arch_decode_instruction(struct elf *
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 +357,13 @@ int arch_decode_instruction(struct elf *
* 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 +375,13 @@ int arch_decode_instruction(struct elf *
* 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 +389,10 @@ int arch_decode_instruction(struct elf *
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 +402,19 @@ int arch_decode_instruction(struct elf *
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 +450,19 @@ int arch_decode_instruction(struct elf *
/* 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 +476,8 @@ int arch_decode_instruction(struct elf *
* pop bp
*/
*type = INSN_STACK;
- op->dest.type = OP_DEST_LEAVE;
+ ADD_OP(op)
+ op->dest.type = OP_DEST_LEAVE;
break;
@@ -449,12 +499,14 @@ int arch_decode_instruction(struct elf *
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 +544,10 @@ int arch_decode_instruction(struct elf *
/* 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 +558,6 @@ int arch_decode_instruction(struct elf *
*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;
}
next prev parent reply other threads:[~2020-04-23 12:52 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-23 12:47 [PATCH 0/8] objtool vs retpoline Peter Zijlstra
2020-04-23 12:47 ` [PATCH 1/8] objtool: is_fentry_call() crashes if call has no destination Peter Zijlstra
2020-04-23 12:47 ` [PATCH 2/8] objtool: UNWIND_HINT_RET_OFFSET should not check registers Peter Zijlstra
2020-04-23 12:47 ` Peter Zijlstra [this message]
2020-04-23 15:40 ` [PATCH 3/8] objtool: Rework allocating stack_ops on decode Alexandre Chartre
2020-04-23 15:54 ` Peter Zijlstra
2020-04-24 7:06 ` Alexandre Chartre
2020-04-23 16:16 ` Peter Zijlstra
2020-04-24 9:43 ` Miroslav Benes
2020-04-23 12:47 ` [PATCH 4/8] objtool: Add support for intra-function calls Peter Zijlstra
2020-04-23 14:34 ` Miroslav Benes
2020-04-23 15:22 ` Peter Zijlstra
2020-04-24 9:37 ` Miroslav Benes
2020-04-24 14:07 ` Miroslav Benes
2020-04-23 12:47 ` [PATCH 5/8] x86/speculation: Change FILL_RETURN_BUFFER to work with objtool Peter Zijlstra
2020-04-23 15:45 ` Alexandre Chartre
2020-04-24 19:04 ` Josh Poimboeuf
2020-04-23 12:47 ` [PATCH 6/8] x86: Simplify retpoline declaration Peter Zijlstra
2020-04-24 19:09 ` Josh Poimboeuf
2020-04-23 12:47 ` [PATCH 7/8] x86: Change {JMP,CALL}_NOSPEC argument Peter Zijlstra
2020-04-23 12:47 ` [PATCH 8/8] x86/retpoline: Fix retpoline unwind Peter Zijlstra
2020-04-23 12:59 ` Peter Zijlstra
2020-04-24 19:30 ` Josh Poimboeuf
2020-04-28 18:30 ` Peter Zijlstra
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