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/*
* Copyright (C) 2019 Intel Corporation. All rights reserved.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
*/
#include "aot_reloc.h"
#define R_386_32 1 /* Direct 32 bit */
#define R_386_PC32 2 /* PC relative 32 bit */
#define R_386_PLT32 4 /* 32-bit address ProcedureLinkageTable */
#if !defined(_WIN32) && !defined(_WIN32_)
/* clang-format off */
void __divdi3();
void __udivdi3();
void __moddi3();
void __umoddi3();
/* clang-format on */
#else
#pragma function(floor)
#pragma function(ceil)
static int64
__divdi3(int64 a, int64 b)
{
return a / b;
}
static uint64
__udivdi3(uint64 a, uint64 b)
{
return a / b;
}
static int64
__moddi3(int64 a, int64 b)
{
return a % b;
}
static uint64
__umoddi3(uint64 a, uint64 b)
{
return a % b;
}
#endif
/* clang-format off */
static SymbolMap target_sym_map[] = {
REG_COMMON_SYMBOLS
/* compiler-rt symbols that come from compiler(e.g. gcc) */
REG_SYM(__divdi3),
REG_SYM(__udivdi3),
REG_SYM(__moddi3),
REG_SYM(__umoddi3)
};
/* clang-format on */
static void
set_error_buf(char *error_buf, uint32 error_buf_size, const char *string)
{
if (error_buf != NULL)
snprintf(error_buf, error_buf_size, "%s", string);
}
SymbolMap *
get_target_symbol_map(uint32 *sym_num)
{
*sym_num = sizeof(target_sym_map) / sizeof(SymbolMap);
return target_sym_map;
}
void
get_current_target(char *target_buf, uint32 target_buf_size)
{
snprintf(target_buf, target_buf_size, "i386");
}
uint32
get_plt_table_size()
{
return 0;
}
void
init_plt_table(uint8 *plt)
{
(void)plt;
}
static bool
check_reloc_offset(uint32 target_section_size, uint64 reloc_offset,
uint32 reloc_data_size, char *error_buf,
uint32 error_buf_size)
{
if (!(reloc_offset < (uint64)target_section_size
&& reloc_offset + reloc_data_size <= (uint64)target_section_size)) {
set_error_buf(error_buf, error_buf_size,
"AOT module load failed: invalid relocation offset.");
return false;
}
return true;
}
bool
apply_relocation(AOTModule *module, uint8 *target_section_addr,
uint32 target_section_size, uint64 reloc_offset,
int64 reloc_addend, uint32 reloc_type, void *symbol_addr,
int32 symbol_index, char *error_buf, uint32 error_buf_size)
{
switch (reloc_type) {
case R_386_32:
{
intptr_t value;
CHECK_RELOC_OFFSET(sizeof(void *));
value = *(intptr_t *)(target_section_addr + (uint32)reloc_offset);
*(uintptr_t *)(target_section_addr + reloc_offset) =
(uintptr_t)symbol_addr + (intptr_t)reloc_addend
+ value; /* S + A */
break;
}
/*
* Handle R_386_PLT32 like R_386_PC32 since it should be able to reach
* any 32 bit address
*/
case R_386_PLT32:
case R_386_PC32:
{
int32 value;
CHECK_RELOC_OFFSET(sizeof(void *));
value = *(int32 *)(target_section_addr + (uint32)reloc_offset);
*(uint32 *)(target_section_addr + (uint32)reloc_offset) =
(uint32)((uintptr_t)symbol_addr + (intptr_t)reloc_addend
- (uintptr_t)(target_section_addr
+ (uint32)reloc_offset)
+ value); /* S + A - P */
break;
}
default:
if (error_buf != NULL)
snprintf(error_buf, error_buf_size,
"Load relocation section failed: "
"invalid relocation type %d.",
reloc_type);
return false;
}
return true;
}
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