lkml.org 
[lkml]   [2020]   [Mar]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH v4 04/13] objtool: Fix !CFI insn_state propagation
Objtool keeps per instruction CFI state in struct insn_state and will
save/restore this where required. However, insn_state has grown some
!CFI state, and this must not be saved/restored (that would
loose/destroy state).

Fix this by moving the CFI specific parts of insn_state into struct
cfi_state.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
---
tools/objtool/cfi.h | 12 ++
tools/objtool/check.c | 270 ++++++++++++++++++++++++------------------------
tools/objtool/check.h | 13 --
tools/objtool/orc_gen.c | 8 -
4 files changed, 160 insertions(+), 143 deletions(-)

--- a/tools/objtool/cfi.h
+++ b/tools/objtool/cfi.h
@@ -36,8 +36,20 @@ struct cfi_reg {
};

struct cfi_init_state {
+ struct cfi_reg regs[CFI_NUM_REGS];
struct cfi_reg cfa;
+};
+
+struct cfi_state {
struct cfi_reg regs[CFI_NUM_REGS];
+ struct cfi_reg vals[CFI_NUM_REGS];
+ struct cfi_reg cfa;
+ int stack_size;
+ int drap_reg, drap_offset;
+ unsigned char type;
+ bool bp_scratch;
+ bool drap;
+ bool end;
};

#endif /* _OBJTOOL_CFI_H */
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -215,18 +215,23 @@ static bool dead_end_function(struct obj
return __dead_end_function(file, func, 0);
}

-static void clear_insn_state(struct insn_state *state)
+static void init_cfi_state(struct cfi_state *cfi)
{
int i;

- memset(state, 0, sizeof(*state));
- state->cfa.base = CFI_UNDEFINED;
for (i = 0; i < CFI_NUM_REGS; i++) {
- state->regs[i].base = CFI_UNDEFINED;
- state->vals[i].base = CFI_UNDEFINED;
+ cfi->regs[i].base = CFI_UNDEFINED;
+ cfi->vals[i].base = CFI_UNDEFINED;
}
- state->drap_reg = CFI_UNDEFINED;
- state->drap_offset = -1;
+ cfi->cfa.base = CFI_UNDEFINED;
+ cfi->drap_reg = CFI_UNDEFINED;
+ cfi->drap_offset = -1;
+}
+
+static void clear_insn_state(struct insn_state *state)
+{
+ memset(state, 0, sizeof(*state));
+ init_cfi_state(&state->cfi);
}

/*
@@ -260,7 +265,7 @@ static int decode_instructions(struct ob
}
memset(insn, 0, sizeof(*insn));
INIT_LIST_HEAD(&insn->alts);
- clear_insn_state(&insn->state);
+ init_cfi_state(&insn->cfi);

insn->sec = sec;
insn->offset = offset;
@@ -769,7 +774,7 @@ static int handle_group_alt(struct objto
}
memset(fake_jump, 0, sizeof(*fake_jump));
INIT_LIST_HEAD(&fake_jump->alts);
- clear_insn_state(&fake_jump->state);
+ init_cfi_state(&fake_jump->cfi);

fake_jump->sec = special_alt->new_sec;
fake_jump->offset = FAKE_JUMP_OFFSET;
@@ -1262,7 +1267,7 @@ static int read_unwind_hints(struct objt
return -1;
}

- cfa = &insn->state.cfa;
+ cfa = &insn->cfi.cfa;

if (hint->type == UNWIND_HINT_TYPE_SAVE) {
insn->save = true;
@@ -1308,8 +1313,8 @@ static int read_unwind_hints(struct objt
}

cfa->offset = hint->sp_offset;
- insn->state.type = hint->type;
- insn->state.end = hint->end;
+ insn->cfi.type = hint->type;
+ insn->cfi.end = hint->end;
}

return 0;
@@ -1436,17 +1441,18 @@ static bool is_fentry_call(struct instru

static bool has_modified_stack_frame(struct insn_state *state)
{
+ struct cfi_state *cfi = &state->cfi;
int i;

- if (state->cfa.base != initial_func_cfi.cfa.base ||
- state->cfa.offset != initial_func_cfi.cfa.offset ||
- state->stack_size != initial_func_cfi.cfa.offset ||
- state->drap)
+ if (cfi->cfa.base != initial_func_cfi.cfa.base ||
+ cfi->cfa.offset != initial_func_cfi.cfa.offset ||
+ cfi->stack_size != initial_func_cfi.cfa.offset ||
+ cfi->drap)
return true;

for (i = 0; i < CFI_NUM_REGS; i++)
- if (state->regs[i].base != initial_func_cfi.regs[i].base ||
- state->regs[i].offset != initial_func_cfi.regs[i].offset)
+ if (cfi->regs[i].base != initial_func_cfi.regs[i].base ||
+ cfi->regs[i].offset != initial_func_cfi.regs[i].offset)
return true;

return false;
@@ -1454,19 +1460,21 @@ static bool has_modified_stack_frame(str

static bool has_valid_stack_frame(struct insn_state *state)
{
- if (state->cfa.base == CFI_BP && state->regs[CFI_BP].base == CFI_CFA &&
- state->regs[CFI_BP].offset == -16)
+ struct cfi_state *cfi = &state->cfi;
+
+ if (cfi->cfa.base == CFI_BP && cfi->regs[CFI_BP].base == CFI_CFA &&
+ cfi->regs[CFI_BP].offset == -16)
return true;

- if (state->drap && state->regs[CFI_BP].base == CFI_BP)
+ if (cfi->drap && cfi->regs[CFI_BP].base == CFI_BP)
return true;

return false;
}

-static int update_insn_state_regs(struct instruction *insn, struct insn_state *state)
+static int update_cfi_state_regs(struct instruction *insn, struct cfi_state *cfi)
{
- struct cfi_reg *cfa = &state->cfa;
+ struct cfi_reg *cfa = &cfi->cfa;
struct stack_op *op = &insn->stack_op;

if (cfa->base != CFI_SP)
@@ -1488,20 +1496,19 @@ static int update_insn_state_regs(struct
return 0;
}

-static void save_reg(struct insn_state *state, unsigned char reg, int base,
- int offset)
+static void save_reg(struct cfi_state *cfi, unsigned char reg, int base, int offset)
{
if (arch_callee_saved_reg(reg) &&
- state->regs[reg].base == CFI_UNDEFINED) {
- state->regs[reg].base = base;
- state->regs[reg].offset = offset;
+ cfi->regs[reg].base == CFI_UNDEFINED) {
+ cfi->regs[reg].base = base;
+ cfi->regs[reg].offset = offset;
}
}

-static void restore_reg(struct insn_state *state, unsigned char reg)
+static void restore_reg(struct cfi_state *cfi, unsigned char reg)
{
- state->regs[reg].base = CFI_UNDEFINED;
- state->regs[reg].offset = 0;
+ cfi->regs[reg].base = CFI_UNDEFINED;
+ cfi->regs[reg].offset = 0;
}

/*
@@ -1557,11 +1564,11 @@ static void restore_reg(struct insn_stat
* 41 5d pop %r13
* c3 retq
*/
-static int update_insn_state(struct instruction *insn, struct insn_state *state)
+static int update_cfi_state(struct instruction *insn, struct cfi_state *cfi)
{
struct stack_op *op = &insn->stack_op;
- struct cfi_reg *cfa = &state->cfa;
- struct cfi_reg *regs = state->regs;
+ struct cfi_reg *cfa = &cfi->cfa;
+ struct cfi_reg *regs = cfi->regs;

/* stack operations don't make sense with an undefined CFA */
if (cfa->base == CFI_UNDEFINED) {
@@ -1572,8 +1579,8 @@ static int update_insn_state(struct inst
return 0;
}

- if (state->type == ORC_TYPE_REGS || state->type == ORC_TYPE_REGS_IRET)
- return update_insn_state_regs(insn, state);
+ if (cfi->type == ORC_TYPE_REGS || cfi->type == ORC_TYPE_REGS_IRET)
+ return update_cfi_state_regs(insn, cfi);

switch (op->dest.type) {

@@ -1588,16 +1595,16 @@ static int update_insn_state(struct inst

/* mov %rsp, %rbp */
cfa->base = op->dest.reg;
- state->bp_scratch = false;
+ cfi->bp_scratch = false;
}

else if (op->src.reg == CFI_SP &&
- op->dest.reg == CFI_BP && state->drap) {
+ op->dest.reg == CFI_BP && cfi->drap) {

/* drap: mov %rsp, %rbp */
regs[CFI_BP].base = CFI_BP;
- regs[CFI_BP].offset = -state->stack_size;
- state->bp_scratch = false;
+ regs[CFI_BP].offset = -cfi->stack_size;
+ cfi->bp_scratch = false;
}

else if (op->src.reg == CFI_SP && cfa->base == CFI_SP) {
@@ -1612,8 +1619,8 @@ static int update_insn_state(struct inst
* ...
* mov %rax, %rsp
*/
- state->vals[op->dest.reg].base = CFI_CFA;
- state->vals[op->dest.reg].offset = -state->stack_size;
+ cfi->vals[op->dest.reg].base = CFI_CFA;
+ cfi->vals[op->dest.reg].offset = -cfi->stack_size;
}

else if (op->src.reg == CFI_BP && op->dest.reg == CFI_SP &&
@@ -1624,14 +1631,14 @@ static int update_insn_state(struct inst
*
* Restore the original stack pointer (Clang).
*/
- state->stack_size = -state->regs[CFI_BP].offset;
+ cfi->stack_size = -cfi->regs[CFI_BP].offset;
}

else if (op->dest.reg == cfa->base) {

/* mov %reg, %rsp */
if (cfa->base == CFI_SP &&
- state->vals[op->src.reg].base == CFI_CFA) {
+ cfi->vals[op->src.reg].base == CFI_CFA) {

/*
* This is needed for the rare case
@@ -1641,8 +1648,8 @@ static int update_insn_state(struct inst
* ...
* mov %rcx, %rsp
*/
- cfa->offset = -state->vals[op->src.reg].offset;
- state->stack_size = cfa->offset;
+ cfa->offset = -cfi->vals[op->src.reg].offset;
+ cfi->stack_size = cfa->offset;

} else {
cfa->base = CFI_UNDEFINED;
@@ -1656,7 +1663,7 @@ static int update_insn_state(struct inst
if (op->dest.reg == CFI_SP && op->src.reg == CFI_SP) {

/* add imm, %rsp */
- state->stack_size -= op->src.offset;
+ cfi->stack_size -= op->src.offset;
if (cfa->base == CFI_SP)
cfa->offset -= op->src.offset;
break;
@@ -1665,14 +1672,14 @@ static int update_insn_state(struct inst
if (op->dest.reg == CFI_SP && op->src.reg == CFI_BP) {

/* lea disp(%rbp), %rsp */
- state->stack_size = -(op->src.offset + regs[CFI_BP].offset);
+ cfi->stack_size = -(op->src.offset + regs[CFI_BP].offset);
break;
}

if (op->src.reg == CFI_SP && cfa->base == CFI_SP) {

/* drap: lea disp(%rsp), %drap */
- state->drap_reg = op->dest.reg;
+ cfi->drap_reg = op->dest.reg;

/*
* lea disp(%rsp), %reg
@@ -1684,25 +1691,25 @@ static int update_insn_state(struct inst
* ...
* mov %rcx, %rsp
*/
- state->vals[op->dest.reg].base = CFI_CFA;
- state->vals[op->dest.reg].offset = \
- -state->stack_size + op->src.offset;
+ cfi->vals[op->dest.reg].base = CFI_CFA;
+ cfi->vals[op->dest.reg].offset = \
+ -cfi->stack_size + op->src.offset;

break;
}

- if (state->drap && op->dest.reg == CFI_SP &&
- op->src.reg == state->drap_reg) {
+ if (cfi->drap && op->dest.reg == CFI_SP &&
+ op->src.reg == cfi->drap_reg) {

/* drap: lea disp(%drap), %rsp */
cfa->base = CFI_SP;
- cfa->offset = state->stack_size = -op->src.offset;
- state->drap_reg = CFI_UNDEFINED;
- state->drap = false;
+ cfa->offset = cfi->stack_size = -op->src.offset;
+ cfi->drap_reg = CFI_UNDEFINED;
+ cfi->drap = false;
break;
}

- if (op->dest.reg == state->cfa.base) {
+ if (op->dest.reg == cfi->cfa.base) {
WARN_FUNC("unsupported stack register modification",
insn->sec, insn->offset);
return -1;
@@ -1712,18 +1719,18 @@ static int update_insn_state(struct inst

case OP_SRC_AND:
if (op->dest.reg != CFI_SP ||
- (state->drap_reg != CFI_UNDEFINED && cfa->base != CFI_SP) ||
- (state->drap_reg == CFI_UNDEFINED && cfa->base != CFI_BP)) {
+ (cfi->drap_reg != CFI_UNDEFINED && cfa->base != CFI_SP) ||
+ (cfi->drap_reg == CFI_UNDEFINED && cfa->base != CFI_BP)) {
WARN_FUNC("unsupported stack pointer realignment",
insn->sec, insn->offset);
return -1;
}

- if (state->drap_reg != CFI_UNDEFINED) {
+ if (cfi->drap_reg != CFI_UNDEFINED) {
/* drap: and imm, %rsp */
- cfa->base = state->drap_reg;
- cfa->offset = state->stack_size = 0;
- state->drap = true;
+ cfa->base = cfi->drap_reg;
+ cfa->offset = cfi->stack_size = 0;
+ cfi->drap = true;
}

/*
@@ -1735,57 +1742,57 @@ static int update_insn_state(struct inst

case OP_SRC_POP:
case OP_SRC_POPF:
- if (!state->drap && op->dest.type == OP_DEST_REG &&
+ if (!cfi->drap && op->dest.type == OP_DEST_REG &&
op->dest.reg == cfa->base) {

/* pop %rbp */
cfa->base = CFI_SP;
}

- if (state->drap && cfa->base == CFI_BP_INDIRECT &&
+ if (cfi->drap && cfa->base == CFI_BP_INDIRECT &&
op->dest.type == OP_DEST_REG &&
- op->dest.reg == state->drap_reg &&
- state->drap_offset == -state->stack_size) {
+ op->dest.reg == cfi->drap_reg &&
+ cfi->drap_offset == -cfi->stack_size) {

/* drap: pop %drap */
- cfa->base = state->drap_reg;
+ cfa->base = cfi->drap_reg;
cfa->offset = 0;
- state->drap_offset = -1;
+ cfi->drap_offset = -1;

- } else if (regs[op->dest.reg].offset == -state->stack_size) {
+ } else if (regs[op->dest.reg].offset == -cfi->stack_size) {

/* pop %reg */
- restore_reg(state, op->dest.reg);
+ restore_reg(cfi, op->dest.reg);
}

- state->stack_size -= 8;
+ cfi->stack_size -= 8;
if (cfa->base == CFI_SP)
cfa->offset -= 8;

break;

case OP_SRC_REG_INDIRECT:
- if (state->drap && op->src.reg == CFI_BP &&
- op->src.offset == state->drap_offset) {
+ if (cfi->drap && op->src.reg == CFI_BP &&
+ op->src.offset == cfi->drap_offset) {

/* drap: mov disp(%rbp), %drap */
- cfa->base = state->drap_reg;
+ cfa->base = cfi->drap_reg;
cfa->offset = 0;
- state->drap_offset = -1;
+ cfi->drap_offset = -1;
}

- if (state->drap && op->src.reg == CFI_BP &&
+ if (cfi->drap && op->src.reg == CFI_BP &&
op->src.offset == regs[op->dest.reg].offset) {

/* drap: mov disp(%rbp), %reg */
- restore_reg(state, op->dest.reg);
+ restore_reg(cfi, op->dest.reg);

} else if (op->src.reg == cfa->base &&
op->src.offset == regs[op->dest.reg].offset + cfa->offset) {

/* mov disp(%rbp), %reg */
/* mov disp(%rsp), %reg */
- restore_reg(state, op->dest.reg);
+ restore_reg(cfi, op->dest.reg);
}

break;
@@ -1800,78 +1807,78 @@ static int update_insn_state(struct inst

case OP_DEST_PUSH:
case OP_DEST_PUSHF:
- state->stack_size += 8;
+ cfi->stack_size += 8;
if (cfa->base == CFI_SP)
cfa->offset += 8;

if (op->src.type != OP_SRC_REG)
break;

- if (state->drap) {
- if (op->src.reg == cfa->base && op->src.reg == state->drap_reg) {
+ if (cfi->drap) {
+ if (op->src.reg == cfa->base && op->src.reg == cfi->drap_reg) {

/* drap: push %drap */
cfa->base = CFI_BP_INDIRECT;
- cfa->offset = -state->stack_size;
+ cfa->offset = -cfi->stack_size;

/* save drap so we know when to restore it */
- state->drap_offset = -state->stack_size;
+ cfi->drap_offset = -cfi->stack_size;

- } else if (op->src.reg == CFI_BP && cfa->base == state->drap_reg) {
+ } else if (op->src.reg == CFI_BP && cfa->base == cfi->drap_reg) {

/* drap: push %rbp */
- state->stack_size = 0;
+ cfi->stack_size = 0;

} else if (regs[op->src.reg].base == CFI_UNDEFINED) {

/* drap: push %reg */
- save_reg(state, op->src.reg, CFI_BP, -state->stack_size);
+ save_reg(cfi, op->src.reg, CFI_BP, -cfi->stack_size);
}

} else {

/* push %reg */
- save_reg(state, op->src.reg, CFI_CFA, -state->stack_size);
+ save_reg(cfi, op->src.reg, CFI_CFA, -cfi->stack_size);
}

/* detect when asm code uses rbp as a scratch register */
if (!no_fp && insn->func && op->src.reg == CFI_BP &&
cfa->base != CFI_BP)
- state->bp_scratch = true;
+ cfi->bp_scratch = true;
break;

case OP_DEST_REG_INDIRECT:

- if (state->drap) {
- if (op->src.reg == cfa->base && op->src.reg == state->drap_reg) {
+ if (cfi->drap) {
+ if (op->src.reg == cfa->base && op->src.reg == cfi->drap_reg) {

/* drap: mov %drap, disp(%rbp) */
cfa->base = CFI_BP_INDIRECT;
cfa->offset = op->dest.offset;

/* save drap offset so we know when to restore it */
- state->drap_offset = op->dest.offset;
+ cfi->drap_offset = op->dest.offset;
}

else if (regs[op->src.reg].base == CFI_UNDEFINED) {

/* drap: mov reg, disp(%rbp) */
- save_reg(state, op->src.reg, CFI_BP, op->dest.offset);
+ save_reg(cfi, op->src.reg, CFI_BP, op->dest.offset);
}

} else if (op->dest.reg == cfa->base) {

/* mov reg, disp(%rbp) */
/* mov reg, disp(%rsp) */
- save_reg(state, op->src.reg, CFI_CFA,
- op->dest.offset - state->cfa.offset);
+ save_reg(cfi, op->src.reg, CFI_CFA,
+ op->dest.offset - cfi->cfa.offset);
}

break;

case OP_DEST_LEAVE:
- if ((!state->drap && cfa->base != CFI_BP) ||
- (state->drap && cfa->base != state->drap_reg)) {
+ if ((!cfi->drap && cfa->base != CFI_BP) ||
+ (cfi->drap && cfa->base != cfi->drap_reg)) {
WARN_FUNC("leave instruction with modified stack frame",
insn->sec, insn->offset);
return -1;
@@ -1879,10 +1886,10 @@ static int update_insn_state(struct inst

/* leave (mov %rbp, %rsp; pop %rbp) */

- state->stack_size = -state->regs[CFI_BP].offset - 8;
- restore_reg(state, CFI_BP);
+ cfi->stack_size = -cfi->regs[CFI_BP].offset - 8;
+ restore_reg(cfi, CFI_BP);

- if (!state->drap) {
+ if (!cfi->drap) {
cfa->base = CFI_SP;
cfa->offset -= 8;
}
@@ -1897,7 +1904,7 @@ static int update_insn_state(struct inst
}

/* pop mem */
- state->stack_size -= 8;
+ cfi->stack_size -= 8;
if (cfa->base == CFI_SP)
cfa->offset -= 8;

@@ -1912,41 +1919,44 @@ static int update_insn_state(struct inst
return 0;
}

-static bool insn_state_match(struct instruction *insn, struct insn_state *state)
+static bool insn_cfi_match(struct instruction *insn, struct cfi_state *cfi2)
{
- struct insn_state *state1 = &insn->state, *state2 = state;
+ struct cfi_state *cfi1 = &insn->cfi;
int i;

- if (memcmp(&state1->cfa, &state2->cfa, sizeof(state1->cfa))) {
+ if (memcmp(&cfi1->cfa, &cfi2->cfa, sizeof(cfi1->cfa))) {
+
WARN_FUNC("stack state mismatch: cfa1=%d%+d cfa2=%d%+d",
insn->sec, insn->offset,
- state1->cfa.base, state1->cfa.offset,
- state2->cfa.base, state2->cfa.offset);
+ cfi1->cfa.base, cfi1->cfa.offset,
+ cfi2->cfa.base, cfi2->cfa.offset);

- } else if (memcmp(&state1->regs, &state2->regs, sizeof(state1->regs))) {
+ } else if (memcmp(&cfi1->regs, &cfi2->regs, sizeof(cfi1->regs))) {
for (i = 0; i < CFI_NUM_REGS; i++) {
- if (!memcmp(&state1->regs[i], &state2->regs[i],
+ if (!memcmp(&cfi1->regs[i], &cfi2->regs[i],
sizeof(struct cfi_reg)))
continue;

WARN_FUNC("stack state mismatch: reg1[%d]=%d%+d reg2[%d]=%d%+d",
insn->sec, insn->offset,
- i, state1->regs[i].base, state1->regs[i].offset,
- i, state2->regs[i].base, state2->regs[i].offset);
+ i, cfi1->regs[i].base, cfi1->regs[i].offset,
+ i, cfi2->regs[i].base, cfi2->regs[i].offset);
break;
}

- } else if (state1->type != state2->type) {
+ } else if (cfi1->type != cfi2->type) {
+
WARN_FUNC("stack state mismatch: type1=%d type2=%d",
- insn->sec, insn->offset, state1->type, state2->type);
+ insn->sec, insn->offset, cfi1->type, cfi2->type);
+
+ } else if (cfi1->drap != cfi2->drap ||
+ (cfi1->drap && cfi1->drap_reg != cfi2->drap_reg) ||
+ (cfi1->drap && cfi1->drap_offset != cfi2->drap_offset)) {

- } else if (state1->drap != state2->drap ||
- (state1->drap && state1->drap_reg != state2->drap_reg) ||
- (state1->drap && state1->drap_offset != state2->drap_offset)) {
WARN_FUNC("stack state mismatch: drap1=%d(%d,%d) drap2=%d(%d,%d)",
insn->sec, insn->offset,
- state1->drap, state1->drap_reg, state1->drap_offset,
- state2->drap, state2->drap_reg, state2->drap_offset);
+ cfi1->drap, cfi1->drap_reg, cfi1->drap_offset,
+ cfi2->drap, cfi2->drap_reg, cfi2->drap_offset);

} else
return true;
@@ -2024,7 +2034,7 @@ static int validate_return(struct symbol
return 1;
}

- if (state->bp_scratch) {
+ if (state->cfi.bp_scratch) {
WARN("%s uses BP as a scratch register",
func->name);
return 1;
@@ -2035,7 +2045,7 @@ static int validate_return(struct symbol

static int apply_insn_hint(struct objtool_file *file, struct section *sec,
struct symbol *func, struct instruction *insn,
- struct insn_state *state)
+ struct cfi_state *cfi)
{
if (insn->restore) {
struct instruction *save_insn, *i;
@@ -2061,10 +2071,10 @@ static int apply_insn_hint(struct objtoo
return 1;
}

- insn->state = save_insn->state;
+ insn->cfi = save_insn->cfi;
}

- state = insn->state;
+ *cfi = insn->cfi;
return 0;
}

@@ -2108,7 +2118,7 @@ static int validate_branch(struct objtoo

visited = 1 << state.uaccess;
if (insn->visited) {
- if (!insn->hint && !insn_state_match(insn, &state))
+ if (!insn->hint && !insn_cfi_match(insn, &state.cfi))
return 1;

if (insn->visited & visited)
@@ -2116,11 +2126,11 @@ static int validate_branch(struct objtoo
}

if (insn->hint) {
- ret = apply_insn_hint(file, sec, func, insn, &state);
+ ret = apply_insn_hint(file, sec, func, insn, &state.cfi);
if (ret)
return ret;
} else
- insn->state = state;
+ insn->cfi = state.cfi;

insn->visited |= visited;

@@ -2210,7 +2220,7 @@ static int validate_branch(struct objtoo
return 0;

case INSN_STACK:
- if (update_insn_state(insn, &state))
+ if (update_cfi_state(insn, &state.cfi))
return 1;

if (insn->stack_op.dest.type == OP_DEST_PUSHF) {
@@ -2280,7 +2290,7 @@ static int validate_branch(struct objtoo
return 0;

if (!next_insn) {
- if (state.cfa.base == CFI_UNDEFINED)
+ if (state.cfi.cfa.base == CFI_UNDEFINED)
return 0;
WARN("%s: unexpected end of section", sec->name);
return 1;
@@ -2420,10 +2430,10 @@ static int validate_section(struct objto

clear_insn_state(&state);

- state.cfa = initial_func_cfi.cfa;
- memcpy(&state.regs, &initial_func_cfi.regs,
+ state.cfi.cfa = initial_func_cfi.cfa;
+ memcpy(&state.cfi.regs, &initial_func_cfi.regs,
CFI_NUM_REGS * sizeof(struct cfi_reg));
- state.stack_size = initial_func_cfi.cfa.offset;
+ state.cfi.stack_size = initial_func_cfi.cfa.offset;

list_for_each_entry(func, &sec->symbol_list, list) {
if (func->type != STT_FUNC)
--- a/tools/objtool/check.h
+++ b/tools/objtool/check.h
@@ -14,15 +14,10 @@
#include <linux/hashtable.h>

struct insn_state {
- struct cfi_reg cfa;
- struct cfi_reg regs[CFI_NUM_REGS];
- int stack_size;
- unsigned char type;
- bool bp_scratch;
- bool drap, end, uaccess, df;
+ struct cfi_state cfi;
unsigned int uaccess_stack;
- int drap_reg, drap_offset;
- struct cfi_reg vals[CFI_NUM_REGS];
+ bool uaccess;
+ bool df;
};

struct instruction {
@@ -43,7 +38,7 @@ struct instruction {
struct list_head alts;
struct symbol *func;
struct stack_op stack_op;
- struct insn_state state;
+ struct cfi_state cfi;
struct orc_entry orc;
};

--- a/tools/objtool/orc_gen.c
+++ b/tools/objtool/orc_gen.c
@@ -16,10 +16,10 @@ int create_orc(struct objtool_file *file

for_each_insn(file, insn) {
struct orc_entry *orc = &insn->orc;
- struct cfi_reg *cfa = &insn->state.cfa;
- struct cfi_reg *bp = &insn->state.regs[CFI_BP];
+ struct cfi_reg *cfa = &insn->cfi.cfa;
+ struct cfi_reg *bp = &insn->cfi.regs[CFI_BP];

- orc->end = insn->state.end;
+ orc->end = insn->cfi.end;

if (cfa->base == CFI_UNDEFINED) {
orc->sp_reg = ORC_REG_UNDEFINED;
@@ -75,7 +75,7 @@ int create_orc(struct objtool_file *file

orc->sp_offset = cfa->offset;
orc->bp_offset = bp->offset;
- orc->type = insn->state.type;
+ orc->type = insn->cfi.type;
}

return 0;

\
 
 \ /
  Last update: 2020-03-25 18:49    [W:0.162 / U:6.552 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site