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/*
* Copyright 2014 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Authors: Tom Stellard <thomas.stellard@amd.com>
*
*/
#include "radeon_elf_util.h"
#include "r600_pipe_common.h"
#include "util/u_memory.h"
#include <gelf.h>
#include <libelf.h>
#include <stdio.h>
static void parse_symbol_table(Elf_Data *symbol_table_data,
const GElf_Shdr *symbol_table_header,
struct radeon_shader_binary *binary)
{
GElf_Sym symbol;
unsigned i = 0;
unsigned symbol_count =
symbol_table_header->sh_size / symbol_table_header->sh_entsize;
/* We are over allocating this list, because symbol_count gives the
* total number of symbols, and we will only be filling the list
* with offsets of global symbols. The memory savings from
* allocating the correct size of this list will be small, and
* I don't think it is worth the cost of pre-computing the number
* of global symbols.
*/
binary->global_symbol_offsets = CALLOC(symbol_count, sizeof(uint64_t));
while (gelf_getsym(symbol_table_data, i++, &symbol)) {
unsigned i;
if (GELF_ST_BIND(symbol.st_info) != STB_GLOBAL ||
symbol.st_shndx == 0 /* Undefined symbol */) {
continue;
}
binary->global_symbol_offsets[binary->global_symbol_count] =
symbol.st_value;
/* Sort the list using bubble sort. This list will usually
* be small. */
for (i = binary->global_symbol_count; i > 0; --i) {
uint64_t lhs = binary->global_symbol_offsets[i - 1];
uint64_t rhs = binary->global_symbol_offsets[i];
if (lhs < rhs) {
break;
}
binary->global_symbol_offsets[i] = lhs;
binary->global_symbol_offsets[i - 1] = rhs;
}
++binary->global_symbol_count;
}
}
static void parse_relocs(Elf *elf, Elf_Data *relocs, Elf_Data *symbols,
unsigned symbol_sh_link,
struct radeon_shader_binary *binary)
{
unsigned i;
if (!relocs || !symbols || !binary->reloc_count) {
return;
}
binary->relocs = CALLOC(binary->reloc_count,
sizeof(struct radeon_shader_reloc));
for (i = 0; i < binary->reloc_count; i++) {
GElf_Sym symbol;
GElf_Rel rel;
char *symbol_name;
struct radeon_shader_reloc *reloc = &binary->relocs[i];
gelf_getrel(relocs, i, &rel);
gelf_getsym(symbols, GELF_R_SYM(rel.r_info), &symbol);
symbol_name = elf_strptr(elf, symbol_sh_link, symbol.st_name);
reloc->offset = rel.r_offset;
strncpy(reloc->name, symbol_name, sizeof(reloc->name)-1);
reloc->name[sizeof(reloc->name)-1] = 0;
}
}
void radeon_elf_read(const char *elf_data, unsigned elf_size,
struct radeon_shader_binary *binary)
{
char *elf_buffer;
Elf *elf;
Elf_Scn *section = NULL;
Elf_Data *symbols = NULL, *relocs = NULL;
size_t section_str_index;
unsigned symbol_sh_link = 0;
/* One of the libelf implementations
* (http://www.mr511.de/software/english.htm) requires calling
* elf_version() before elf_memory().
*/
elf_version(EV_CURRENT);
elf_buffer = MALLOC(elf_size);
memcpy(elf_buffer, elf_data, elf_size);
elf = elf_memory(elf_buffer, elf_size);
elf_getshdrstrndx(elf, §ion_str_index);
while ((section = elf_nextscn(elf, section))) {
const char *name;
Elf_Data *section_data = NULL;
GElf_Shdr section_header;
if (gelf_getshdr(section, §ion_header) != §ion_header) {
fprintf(stderr, "Failed to read ELF section header\n");
return;
}
name = elf_strptr(elf, section_str_index, section_header.sh_name);
if (!strcmp(name, ".text")) {
section_data = elf_getdata(section, section_data);
binary->code_size = section_data->d_size;
binary->code = MALLOC(binary->code_size * sizeof(unsigned char));
memcpy(binary->code, section_data->d_buf, binary->code_size);
} else if (!strcmp(name, ".AMDGPU.config")) {
section_data = elf_getdata(section, section_data);
binary->config_size = section_data->d_size;
binary->config = MALLOC(binary->config_size * sizeof(unsigned char));
memcpy(binary->config, section_data->d_buf, binary->config_size);
} else if (!strcmp(name, ".AMDGPU.disasm")) {
/* Always read disassembly if it's available. */
section_data = elf_getdata(section, section_data);
binary->disasm_string = strndup(section_data->d_buf,
section_data->d_size);
} else if (!strncmp(name, ".rodata", 7)) {
section_data = elf_getdata(section, section_data);
binary->rodata_size = section_data->d_size;
binary->rodata = MALLOC(binary->rodata_size * sizeof(unsigned char));
memcpy(binary->rodata, section_data->d_buf, binary->rodata_size);
} else if (!strncmp(name, ".symtab", 7)) {
symbols = elf_getdata(section, section_data);
symbol_sh_link = section_header.sh_link;
parse_symbol_table(symbols, §ion_header, binary);
} else if (!strcmp(name, ".rel.text")) {
relocs = elf_getdata(section, section_data);
binary->reloc_count = section_header.sh_size /
section_header.sh_entsize;
}
}
parse_relocs(elf, relocs, symbols, symbol_sh_link, binary);
if (elf){
elf_end(elf);
}
FREE(elf_buffer);
/* Cache the config size per symbol */
if (binary->global_symbol_count) {
binary->config_size_per_symbol =
binary->config_size / binary->global_symbol_count;
} else {
binary->global_symbol_count = 1;
binary->config_size_per_symbol = binary->config_size;
}
}
const unsigned char *radeon_shader_binary_config_start(
const struct radeon_shader_binary *binary,
uint64_t symbol_offset)
{
unsigned i;
for (i = 0; i < binary->global_symbol_count; ++i) {
if (binary->global_symbol_offsets[i] == symbol_offset) {
unsigned offset = i * binary->config_size_per_symbol;
return binary->config + offset;
}
}
return binary->config;
}
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