mirror of
https://github.com/JakeHillion/drgn.git
synced 2024-12-24 10:03:05 +00:00
a4b9d68a8c
Apparently the latter is deprecated and the former is preferred. Signed-off-by: Omar Sandoval <osandov@osandov.com>
107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
// Copyright (c) Facebook, Inc. and its affiliates.
|
|
// SPDX-License-Identifier: GPL-3.0-or-later
|
|
|
|
#include <assert.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "cfi.h"
|
|
|
|
const struct drgn_cfi_row drgn_empty_cfi_row_impl;
|
|
|
|
bool drgn_cfi_row_copy(struct drgn_cfi_row **dst,
|
|
const struct drgn_cfi_row *src)
|
|
{
|
|
if (src->num_regs + 1 > (*dst)->allocated_rules) {
|
|
if ((*dst)->allocated_rules == 0 && src->allocated_rules == 0) {
|
|
*dst = (struct drgn_cfi_row *)src;
|
|
return true;
|
|
}
|
|
struct drgn_cfi_row *tmp =
|
|
malloc(sizeof(struct drgn_cfi_row) +
|
|
src->num_regs * sizeof(struct drgn_cfi_rule));
|
|
if (!tmp)
|
|
return false;
|
|
tmp->allocated_rules = src->num_regs + 1;
|
|
drgn_cfi_row_destroy(*dst);
|
|
*dst = tmp;
|
|
}
|
|
(*dst)->num_regs = src->num_regs;
|
|
(*dst)->cfa_rule = src->cfa_rule;
|
|
memcpy((*dst)->reg_rules, src->reg_rules,
|
|
(*dst)->num_regs * sizeof((*dst)->reg_rules[0]));
|
|
return true;
|
|
}
|
|
|
|
static bool drgn_cfi_row_reserve(struct drgn_cfi_row **row, uint16_t num_rules)
|
|
{
|
|
if ((*row)->allocated_rules < num_rules) {
|
|
if (num_rules < (*row)->num_regs + 1)
|
|
num_rules = (*row)->num_regs + 1;
|
|
size_t size;
|
|
if (__builtin_mul_overflow((uint16_t)(num_rules - 1),
|
|
sizeof(struct drgn_cfi_rule),
|
|
&size) ||
|
|
__builtin_add_overflow(sizeof(struct drgn_cfi_row), size,
|
|
&size))
|
|
return false;
|
|
struct drgn_cfi_row *tmp;
|
|
if ((*row)->allocated_rules == 0) {
|
|
tmp = malloc(size);
|
|
if (!tmp)
|
|
return false;
|
|
tmp->num_regs = (*row)->num_regs;
|
|
tmp->cfa_rule = (*row)->cfa_rule;
|
|
memcpy(tmp->reg_rules, (*row)->reg_rules,
|
|
tmp->num_regs * sizeof(tmp->reg_rules[0]));
|
|
} else {
|
|
tmp = realloc(*row, size);
|
|
if (!tmp)
|
|
return false;
|
|
}
|
|
tmp->allocated_rules = num_rules;
|
|
*row = tmp;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool drgn_cfi_row_set_cfa(struct drgn_cfi_row **row,
|
|
const struct drgn_cfi_rule *rule)
|
|
{
|
|
assert(rule->kind != DRGN_CFI_RULE_AT_CFA_PLUS_OFFSET);
|
|
assert(rule->kind != DRGN_CFI_RULE_CFA_PLUS_OFFSET);
|
|
if (!drgn_cfi_row_reserve(row, 1))
|
|
return false;
|
|
(*row)->cfa_rule = *rule;
|
|
return true;
|
|
}
|
|
|
|
void drgn_cfi_row_get_register(const struct drgn_cfi_row *row,
|
|
drgn_register_number regno,
|
|
struct drgn_cfi_rule *ret)
|
|
{
|
|
if (regno < row->num_regs)
|
|
*ret = row->reg_rules[regno];
|
|
else
|
|
ret->kind = DRGN_CFI_RULE_UNDEFINED;
|
|
}
|
|
|
|
bool drgn_cfi_row_set_register(struct drgn_cfi_row **row,
|
|
drgn_register_number regno,
|
|
const struct drgn_cfi_rule *rule)
|
|
{
|
|
assert(regno <= DRGN_MAX_REGISTER_NUMBER);
|
|
if (!drgn_cfi_row_reserve(row, regno + 2))
|
|
return false;
|
|
if (regno >= (*row)->num_regs) {
|
|
static_assert(DRGN_CFI_RULE_UNDEFINED == 0,
|
|
"DRGN_CFI_RULE_UNDEFINED must be zero");
|
|
memset(&(*row)->reg_rules[(*row)->num_regs], 0,
|
|
(regno - (*row)->num_regs) *
|
|
sizeof((*row)->reg_rules[0]));
|
|
(*row)->num_regs = regno + 1;
|
|
}
|
|
(*row)->reg_rules[regno] = *rule;
|
|
return true;
|
|
}
|