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-rw-r--r--src/amd/common/ac_binary.c288
1 files changed, 288 insertions, 0 deletions
diff --git a/src/amd/common/ac_binary.c b/src/amd/common/ac_binary.c
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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 <[email protected]>
+ *
+ * Based on radeon_elf_util.c.
+ */
+
+#include "ac_binary.h"
+
+#include "util/u_math.h"
+#include "util/u_memory.h"
+
+#include <gelf.h>
+#include <libelf.h>
+#include <stdio.h>
+
+#include <sid.h>
+
+#define SPILLED_SGPRS 0x4
+#define SPILLED_VGPRS 0x8
+
+static void parse_symbol_table(Elf_Data *symbol_table_data,
+ const GElf_Shdr *symbol_table_header,
+ struct ac_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 ac_shader_binary *binary)
+{
+ unsigned i;
+
+ if (!relocs || !symbols || !binary->reloc_count) {
+ return;
+ }
+ binary->relocs = CALLOC(binary->reloc_count,
+ sizeof(struct ac_shader_reloc));
+ for (i = 0; i < binary->reloc_count; i++) {
+ GElf_Sym symbol;
+ GElf_Rel rel;
+ char *symbol_name;
+ struct ac_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 ac_elf_read(const char *elf_data, unsigned elf_size,
+ struct ac_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, &section_str_index);
+
+ while ((section = elf_nextscn(elf, section))) {
+ const char *name;
+ Elf_Data *section_data = NULL;
+ GElf_Shdr section_header;
+ if (gelf_getshdr(section, &section_header) != &section_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, &section_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;
+ }
+}
+
+static
+const unsigned char *ac_shader_binary_config_start(
+ const struct ac_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;
+}
+
+
+static const char *scratch_rsrc_dword0_symbol =
+ "SCRATCH_RSRC_DWORD0";
+
+static const char *scratch_rsrc_dword1_symbol =
+ "SCRATCH_RSRC_DWORD1";
+
+void ac_shader_binary_read_config(struct ac_shader_binary *binary,
+ struct ac_shader_config *conf,
+ unsigned symbol_offset)
+{
+ unsigned i;
+ const unsigned char *config =
+ ac_shader_binary_config_start(binary, symbol_offset);
+ bool really_needs_scratch = false;
+
+ /* LLVM adds SGPR spills to the scratch size.
+ * Find out if we really need the scratch buffer.
+ */
+ for (i = 0; i < binary->reloc_count; i++) {
+ const struct ac_shader_reloc *reloc = &binary->relocs[i];
+
+ if (!strcmp(scratch_rsrc_dword0_symbol, reloc->name) ||
+ !strcmp(scratch_rsrc_dword1_symbol, reloc->name)) {
+ really_needs_scratch = true;
+ break;
+ }
+ }
+
+ for (i = 0; i < binary->config_size_per_symbol; i+= 8) {
+ unsigned reg = util_le32_to_cpu(*(uint32_t*)(config + i));
+ unsigned value = util_le32_to_cpu(*(uint32_t*)(config + i + 4));
+ switch (reg) {
+ case R_00B028_SPI_SHADER_PGM_RSRC1_PS:
+ case R_00B128_SPI_SHADER_PGM_RSRC1_VS:
+ case R_00B228_SPI_SHADER_PGM_RSRC1_GS:
+ case R_00B848_COMPUTE_PGM_RSRC1:
+ conf->num_sgprs = MAX2(conf->num_sgprs, (G_00B028_SGPRS(value) + 1) * 8);
+ conf->num_vgprs = MAX2(conf->num_vgprs, (G_00B028_VGPRS(value) + 1) * 4);
+ conf->float_mode = G_00B028_FLOAT_MODE(value);
+ break;
+ case R_00B02C_SPI_SHADER_PGM_RSRC2_PS:
+ conf->lds_size = MAX2(conf->lds_size, G_00B02C_EXTRA_LDS_SIZE(value));
+ break;
+ case R_00B84C_COMPUTE_PGM_RSRC2:
+ conf->lds_size = MAX2(conf->lds_size, G_00B84C_LDS_SIZE(value));
+ break;
+ case R_0286CC_SPI_PS_INPUT_ENA:
+ conf->spi_ps_input_ena = value;
+ break;
+ case R_0286D0_SPI_PS_INPUT_ADDR:
+ conf->spi_ps_input_addr = value;
+ break;
+ case R_0286E8_SPI_TMPRING_SIZE:
+ case R_00B860_COMPUTE_TMPRING_SIZE:
+ /* WAVESIZE is in units of 256 dwords. */
+ if (really_needs_scratch)
+ conf->scratch_bytes_per_wave =
+ G_00B860_WAVESIZE(value) * 256 * 4;
+ break;
+ case SPILLED_SGPRS:
+ conf->spilled_sgprs = value;
+ break;
+ case SPILLED_VGPRS:
+ conf->spilled_vgprs = value;
+ break;
+ default:
+ {
+ static bool printed;
+
+ if (!printed) {
+ fprintf(stderr, "Warning: LLVM emitted unknown "
+ "config register: 0x%x\n", reg);
+ printed = true;
+ }
+ }
+ break;
+ }
+
+ if (!conf->spi_ps_input_addr)
+ conf->spi_ps_input_addr = conf->spi_ps_input_ena;
+ }
+}
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