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* Copyright 2014-2019 Advanced Micro Devices, Inc.
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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#include "ac_binary.h"
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#include "ac_gpu_info.h"
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#include "util/compiler.h"
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#include "util/u_dynarray.h"
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#include "util/u_math.h"
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// Old distributions may not have this enum constant
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#ifndef STT_AMDGPU_LDS
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#define STT_AMDGPU_LDS 13 // this is deprecated -- remove
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#ifndef SHN_AMDGPU_LDS
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#define SHN_AMDGPU_LDS 0xff00
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#define R_AMDGPU_NONE 0
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#define R_AMDGPU_ABS32_LO 1
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#define R_AMDGPU_ABS32_HI 2
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#define R_AMDGPU_ABS64 3
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#define R_AMDGPU_REL32 4
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#define R_AMDGPU_REL64 5
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#define R_AMDGPU_ABS32 6
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#define R_AMDGPU_GOTPCREL 7
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#define R_AMDGPU_GOTPCREL32_LO 8
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#define R_AMDGPU_GOTPCREL32_HI 9
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#define R_AMDGPU_REL32_LO 10
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#define R_AMDGPU_REL32_HI 11
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#define R_AMDGPU_RELATIVE64 13
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/* For the UMR disassembler. */
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#define DEBUGGER_END_OF_CODE_MARKER 0xbf9f0000 /* invalid instruction */
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#define DEBUGGER_NUM_MARKERS 5
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struct ac_rtld_section {
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bool is_pasted_text : 1;
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struct ac_rtld_section *sections;
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unsigned num_sections;
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static void report_errorvf(const char *fmt, va_list va)
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fprintf(stderr, "ac_rtld error: ");
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vfprintf(stderr, fmt, va);
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fprintf(stderr, "\n");
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static void report_errorf(const char *fmt, ...) PRINTFLIKE(1, 2);
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static void report_errorf(const char *fmt, ...)
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report_errorvf(fmt, va);
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static void report_elf_errorf(const char *fmt, ...) PRINTFLIKE(1, 2);
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static void report_elf_errorf(const char *fmt, ...)
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report_errorvf(fmt, va);
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fprintf(stderr, "ELF error: %s\n", elf_errmsg(elf_errno()));
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* Find a symbol in a dynarray of struct ac_rtld_symbol by \p name and shader
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static const struct ac_rtld_symbol *find_symbol(const struct util_dynarray *symbols,
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const char *name, unsigned part_idx)
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util_dynarray_foreach (symbols, struct ac_rtld_symbol, symbol) {
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if ((symbol->part_idx == ~0u || symbol->part_idx == part_idx) && !strcmp(name, symbol->name))
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static int compare_symbol_by_align(const void *lhsp, const void *rhsp)
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const struct ac_rtld_symbol *lhs = lhsp;
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const struct ac_rtld_symbol *rhs = rhsp;
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if (rhs->align > lhs->align)
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if (rhs->align < lhs->align)
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* Sort the given symbol list by decreasing alignment and assign offsets.
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static bool layout_symbols(struct ac_rtld_symbol *symbols, unsigned num_symbols,
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uint64_t *ptotal_size)
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qsort(symbols, num_symbols, sizeof(*symbols), compare_symbol_by_align);
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uint64_t total_size = *ptotal_size;
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for (unsigned i = 0; i < num_symbols; ++i) {
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struct ac_rtld_symbol *s = &symbols[i];
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assert(util_is_power_of_two_nonzero(s->align));
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total_size = align64(total_size, s->align);
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s->offset = total_size;
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if (total_size + s->size < total_size) {
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report_errorf("%s: size overflow", __FUNCTION__);
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total_size += s->size;
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*ptotal_size = total_size;
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* Read LDS symbols from the given \p section of the ELF of \p part and append
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* them to the LDS symbols list.
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* Shared LDS symbols are filtered out.
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static bool read_private_lds_symbols(struct ac_rtld_binary *binary, unsigned part_idx,
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Elf_Scn *section, uint32_t *lds_end_align)
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#define report_if(cond) \
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report_errorf(#cond); \
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#define report_elf_if(cond) \
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report_elf_errorf(#cond); \
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struct ac_rtld_part *part = &binary->parts[part_idx];
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Elf64_Shdr *shdr = elf64_getshdr(section);
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uint32_t strtabidx = shdr->sh_link;
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Elf_Data *symbols_data = elf_getdata(section, NULL);
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report_elf_if(!symbols_data);
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const Elf64_Sym *symbol = symbols_data->d_buf;
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size_t num_symbols = symbols_data->d_size / sizeof(Elf64_Sym);
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for (size_t j = 0; j < num_symbols; ++j, ++symbol) {
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struct ac_rtld_symbol s = {0};
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if (ELF64_ST_TYPE(symbol->st_info) == STT_AMDGPU_LDS) {
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/* old-style LDS symbols from initial prototype -- remove eventually */
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s.align = MIN2(1u << (symbol->st_other >> 3), 1u << 16);
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} else if (symbol->st_shndx == SHN_AMDGPU_LDS) {
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s.align = MIN2(symbol->st_value, 1u << 16);
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report_if(!util_is_power_of_two_nonzero(s.align));
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report_if(symbol->st_size > 1u << 29);
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s.name = elf_strptr(part->elf, strtabidx, symbol->st_name);
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s.size = symbol->st_size;
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s.part_idx = part_idx;
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if (!strcmp(s.name, "__lds_end")) {
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report_elf_if(s.size != 0);
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*lds_end_align = MAX2(*lds_end_align, s.align);
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const struct ac_rtld_symbol *shared = find_symbol(&binary->lds_symbols, s.name, part_idx);
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report_elf_if(s.align > shared->align);
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report_elf_if(s.size > shared->size);
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util_dynarray_append(&binary->lds_symbols, struct ac_rtld_symbol, s);
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* Open a binary consisting of one or more shader parts.
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* \param binary the uninitialized struct
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* \param i binary opening parameters
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bool ac_rtld_open(struct ac_rtld_binary *binary, struct ac_rtld_open_info i)
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/* One of the libelf implementations
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* (http://www.mr511.de/software/english.htm) requires calling
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* elf_version() before elf_memory().
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elf_version(EV_CURRENT);
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memset(binary, 0, sizeof(*binary));
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memcpy(&binary->options, &i.options, sizeof(binary->options));
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binary->wave_size = i.wave_size;
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binary->num_parts = i.num_parts;
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binary->parts = calloc(sizeof(*binary->parts), i.num_parts);
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uint64_t pasted_text_size = 0;
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uint64_t rx_align = 1;
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uint64_t rx_size = 0;
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uint64_t exec_size = 0;
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#define report_if(cond) \
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report_errorf(#cond); \
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#define report_elf_if(cond) \
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report_elf_errorf(#cond); \
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/* Copy and layout shared LDS symbols. */
286
if (i.num_shared_lds_symbols) {
287
if (!util_dynarray_resize(&binary->lds_symbols, struct ac_rtld_symbol,
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i.num_shared_lds_symbols))
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memcpy(binary->lds_symbols.data, i.shared_lds_symbols, binary->lds_symbols.size);
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util_dynarray_foreach (&binary->lds_symbols, struct ac_rtld_symbol, symbol)
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symbol->part_idx = ~0u;
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unsigned max_lds_size = 64 * 1024;
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if (i.info->chip_class == GFX6 ||
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(i.shader_type != MESA_SHADER_COMPUTE && i.shader_type != MESA_SHADER_FRAGMENT))
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max_lds_size = 32 * 1024;
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uint64_t shared_lds_size = 0;
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if (!layout_symbols(binary->lds_symbols.data, i.num_shared_lds_symbols, &shared_lds_size))
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if (shared_lds_size > max_lds_size) {
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fprintf(stderr, "ac_rtld error(1): too much LDS (used = %u, max = %u)\n",
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(unsigned)shared_lds_size, max_lds_size);
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binary->lds_size = shared_lds_size;
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/* First pass over all parts: open ELFs, pre-determine the placement of
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* sections in the memory image, and collect and layout private LDS symbols. */
316
uint32_t lds_end_align = 0;
318
if (binary->options.halt_at_entry)
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pasted_text_size += 4;
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for (unsigned part_idx = 0; part_idx < i.num_parts; ++part_idx) {
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struct ac_rtld_part *part = &binary->parts[part_idx];
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unsigned part_lds_symbols_begin =
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util_dynarray_num_elements(&binary->lds_symbols, struct ac_rtld_symbol);
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part->elf = elf_memory((char *)i.elf_ptrs[part_idx], i.elf_sizes[part_idx]);
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report_elf_if(!part->elf);
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const Elf64_Ehdr *ehdr = elf64_getehdr(part->elf);
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report_elf_if(!ehdr);
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report_if(ehdr->e_machine != EM_AMDGPU);
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size_t section_str_index;
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report_elf_if(elf_getshdrstrndx(part->elf, §ion_str_index) < 0);
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report_elf_if(elf_getshdrnum(part->elf, &num_shdrs) < 0);
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part->num_sections = num_shdrs;
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part->sections = calloc(sizeof(*part->sections), num_shdrs);
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report_if(!part->sections);
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Elf_Scn *section = NULL;
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while ((section = elf_nextscn(part->elf, section))) {
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Elf64_Shdr *shdr = elf64_getshdr(section);
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struct ac_rtld_section *s = &part->sections[elf_ndxscn(section)];
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s->name = elf_strptr(part->elf, section_str_index, shdr->sh_name);
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report_elf_if(!s->name);
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/* Cannot actually handle linked objects yet */
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report_elf_if(shdr->sh_addr != 0);
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/* Alignment must be 0 or a power of two */
353
report_elf_if(shdr->sh_addralign & (shdr->sh_addralign - 1));
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uint64_t sh_align = MAX2(shdr->sh_addralign, 1);
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if (shdr->sh_flags & SHF_ALLOC && shdr->sh_type != SHT_NOTE) {
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report_if(shdr->sh_flags & SHF_WRITE);
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if (shdr->sh_flags & SHF_EXECINSTR) {
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report_elf_if(shdr->sh_size & 3);
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if (!strcmp(s->name, ".text"))
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s->is_pasted_text = true;
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exec_size += shdr->sh_size;
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if (s->is_pasted_text) {
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s->offset = pasted_text_size;
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pasted_text_size += shdr->sh_size;
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rx_align = align(rx_align, sh_align);
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rx_size = align(rx_size, sh_align);
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rx_size += shdr->sh_size;
379
} else if (shdr->sh_type == SHT_SYMTAB) {
380
if (!read_private_lds_symbols(binary, part_idx, section, &lds_end_align))
385
uint64_t part_lds_size = shared_lds_size;
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if (!layout_symbols(util_dynarray_element(&binary->lds_symbols, struct ac_rtld_symbol,
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part_lds_symbols_begin),
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util_dynarray_num_elements(&binary->lds_symbols, struct ac_rtld_symbol) -
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part_lds_symbols_begin,
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binary->lds_size = MAX2(binary->lds_size, part_lds_size);
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binary->rx_end_markers = pasted_text_size;
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pasted_text_size += 4 * DEBUGGER_NUM_MARKERS;
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/* __lds_end is a special symbol that points at the end of the memory
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* occupied by other LDS symbols. Its alignment is taken as the
400
* maximum of its alignment over all shader parts where it occurs.
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binary->lds_size = align(binary->lds_size, lds_end_align);
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struct ac_rtld_symbol *lds_end =
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util_dynarray_grow(&binary->lds_symbols, struct ac_rtld_symbol, 1);
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lds_end->name = "__lds_end";
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lds_end->align = lds_end_align;
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lds_end->offset = binary->lds_size;
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lds_end->part_idx = ~0u;
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if (binary->lds_size > max_lds_size) {
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fprintf(stderr, "ac_rtld error(2): too much LDS (used = %u, max = %u)\n",
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(unsigned)binary->lds_size, max_lds_size);
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/* Second pass: Adjust offsets of non-pasted text sections. */
421
binary->rx_size = pasted_text_size;
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binary->rx_size = align(binary->rx_size, rx_align);
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for (unsigned part_idx = 0; part_idx < i.num_parts; ++part_idx) {
425
struct ac_rtld_part *part = &binary->parts[part_idx];
427
elf_getshdrnum(part->elf, &num_shdrs);
429
for (unsigned j = 0; j < num_shdrs; ++j) {
430
struct ac_rtld_section *s = &part->sections[j];
431
if (s->is_rx && !s->is_pasted_text)
432
s->offset += binary->rx_size;
436
binary->rx_size += rx_size;
437
binary->exec_size = exec_size;
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/* The SQ fetches up to N cache lines of 16 dwords
440
* ahead of the PC, configurable by SH_MEM_CONFIG and
441
* S_INST_PREFETCH. This can cause two issues:
443
* (1) Crossing a page boundary to an unmapped page. The logic
444
* does not distinguish between a required fetch and a "mere"
445
* prefetch and will fault.
447
* (2) Prefetching instructions that will be changed for a
450
* (2) is not currently an issue because we flush the I$ at IB
451
* boundaries, but (1) needs to be addressed. Due to buffer
452
* suballocation, we just play it safe.
454
unsigned prefetch_distance = 0;
456
if (!i.info->has_graphics && i.info->family >= CHIP_ALDEBARAN)
457
prefetch_distance = 16;
458
else if (i.info->chip_class >= GFX10)
459
prefetch_distance = 3;
461
if (prefetch_distance)
462
binary->rx_size = align(binary->rx_size + prefetch_distance * 64, 64);
470
ac_rtld_close(binary);
474
void ac_rtld_close(struct ac_rtld_binary *binary)
476
for (unsigned i = 0; i < binary->num_parts; ++i) {
477
struct ac_rtld_part *part = &binary->parts[i];
478
free(part->sections);
482
util_dynarray_fini(&binary->lds_symbols);
484
binary->parts = NULL;
485
binary->num_parts = 0;
488
static bool get_section_by_name(struct ac_rtld_part *part, const char *name, const char **data,
491
for (unsigned i = 0; i < part->num_sections; ++i) {
492
struct ac_rtld_section *s = &part->sections[i];
493
if (s->name && !strcmp(name, s->name)) {
494
Elf_Scn *target_scn = elf_getscn(part->elf, i);
495
Elf_Data *target_data = elf_getdata(target_scn, NULL);
497
report_elf_errorf("ac_rtld: get_section_by_name: elf_getdata");
501
*data = target_data->d_buf;
502
*nbytes = target_data->d_size;
509
bool ac_rtld_get_section_by_name(struct ac_rtld_binary *binary, const char *name, const char **data,
512
assert(binary->num_parts == 1);
513
return get_section_by_name(&binary->parts[0], name, data, nbytes);
516
bool ac_rtld_read_config(const struct radeon_info *info, struct ac_rtld_binary *binary,
517
struct ac_shader_config *config)
519
for (unsigned i = 0; i < binary->num_parts; ++i) {
520
struct ac_rtld_part *part = &binary->parts[i];
521
const char *config_data;
522
size_t config_nbytes;
524
if (!get_section_by_name(part, ".AMDGPU.config", &config_data, &config_nbytes))
527
/* TODO: be precise about scratch use? */
528
struct ac_shader_config c = {0};
529
ac_parse_shader_binary_config(config_data, config_nbytes, binary->wave_size, true, info, &c);
531
config->num_sgprs = MAX2(config->num_sgprs, c.num_sgprs);
532
config->num_vgprs = MAX2(config->num_vgprs, c.num_vgprs);
533
config->spilled_sgprs = MAX2(config->spilled_sgprs, c.spilled_sgprs);
534
config->spilled_vgprs = MAX2(config->spilled_vgprs, c.spilled_vgprs);
535
config->scratch_bytes_per_wave =
536
MAX2(config->scratch_bytes_per_wave, c.scratch_bytes_per_wave);
538
assert(i == 0 || config->float_mode == c.float_mode);
539
config->float_mode = c.float_mode;
541
/* SPI_PS_INPUT_ENA/ADDR can't be combined. Only the value from
542
* the main shader part is used. */
543
assert(config->spi_ps_input_ena == 0 && config->spi_ps_input_addr == 0);
544
config->spi_ps_input_ena = c.spi_ps_input_ena;
545
config->spi_ps_input_addr = c.spi_ps_input_addr;
547
/* TODO: consistently use LDS symbols for this */
548
config->lds_size = MAX2(config->lds_size, c.lds_size);
550
/* TODO: Should we combine these somehow? It's currently only
551
* used for radeonsi's compute, where multiple parts aren't used. */
552
assert(config->rsrc1 == 0 && config->rsrc2 == 0);
553
config->rsrc1 = c.rsrc1;
554
config->rsrc2 = c.rsrc2;
560
static bool resolve_symbol(const struct ac_rtld_upload_info *u, unsigned part_idx,
561
const Elf64_Sym *sym, const char *name, uint64_t *value)
563
/* TODO: properly disentangle the undef and the LDS cases once
564
* STT_AMDGPU_LDS is retired. */
565
if (sym->st_shndx == SHN_UNDEF || sym->st_shndx == SHN_AMDGPU_LDS) {
566
const struct ac_rtld_symbol *lds_sym = find_symbol(&u->binary->lds_symbols, name, part_idx);
569
*value = lds_sym->offset;
573
/* TODO: resolve from other parts */
575
if (u->get_external_symbol(u->cb_data, name, value))
578
report_errorf("symbol %s: unknown", name);
582
struct ac_rtld_part *part = &u->binary->parts[part_idx];
583
if (sym->st_shndx >= part->num_sections) {
584
report_errorf("symbol %s: section out of bounds", name);
588
struct ac_rtld_section *s = &part->sections[sym->st_shndx];
590
report_errorf("symbol %s: bad section", name);
594
uint64_t section_base = u->rx_va + s->offset;
596
*value = section_base + sym->st_value;
600
static bool apply_relocs(const struct ac_rtld_upload_info *u, unsigned part_idx,
601
const Elf64_Shdr *reloc_shdr, const Elf_Data *reloc_data)
603
#define report_if(cond) \
606
report_errorf(#cond); \
610
#define report_elf_if(cond) \
613
report_elf_errorf(#cond); \
618
struct ac_rtld_part *part = &u->binary->parts[part_idx];
619
Elf_Scn *target_scn = elf_getscn(part->elf, reloc_shdr->sh_info);
620
report_elf_if(!target_scn);
622
Elf_Data *target_data = elf_getdata(target_scn, NULL);
623
report_elf_if(!target_data);
625
Elf_Scn *symbols_scn = elf_getscn(part->elf, reloc_shdr->sh_link);
626
report_elf_if(!symbols_scn);
628
Elf64_Shdr *symbols_shdr = elf64_getshdr(symbols_scn);
629
report_elf_if(!symbols_shdr);
630
uint32_t strtabidx = symbols_shdr->sh_link;
632
Elf_Data *symbols_data = elf_getdata(symbols_scn, NULL);
633
report_elf_if(!symbols_data);
635
const Elf64_Sym *symbols = symbols_data->d_buf;
636
size_t num_symbols = symbols_data->d_size / sizeof(Elf64_Sym);
638
struct ac_rtld_section *s = &part->sections[reloc_shdr->sh_info];
639
report_if(!s->is_rx);
641
const char *orig_base = target_data->d_buf;
642
char *dst_base = u->rx_ptr + s->offset;
643
uint64_t va_base = u->rx_va + s->offset;
645
Elf64_Rel *rel = reloc_data->d_buf;
646
size_t num_relocs = reloc_data->d_size / sizeof(*rel);
647
for (size_t i = 0; i < num_relocs; ++i, ++rel) {
648
size_t r_sym = ELF64_R_SYM(rel->r_info);
649
unsigned r_type = ELF64_R_TYPE(rel->r_info);
651
const char *orig_ptr = orig_base + rel->r_offset;
652
char *dst_ptr = dst_base + rel->r_offset;
653
uint64_t va = va_base + rel->r_offset;
658
if (r_sym == STN_UNDEF) {
661
report_elf_if(r_sym >= num_symbols);
663
const Elf64_Sym *sym = &symbols[r_sym];
664
const char *symbol_name = elf_strptr(part->elf, strtabidx, sym->st_name);
665
report_elf_if(!symbol_name);
667
if (!resolve_symbol(u, part_idx, sym, symbol_name, &symbol))
671
/* TODO: Should we also support .rela sections, where the
672
* addend is part of the relocation record? */
674
/* Load the addend from the ELF instead of the destination,
675
* because the destination may be in VRAM. */
678
case R_AMDGPU_ABS32_LO:
679
case R_AMDGPU_ABS32_HI:
681
case R_AMDGPU_REL32_LO:
682
case R_AMDGPU_REL32_HI:
683
addend = *(const uint32_t *)orig_ptr;
687
addend = *(const uint64_t *)orig_ptr;
690
report_errorf("unsupported r_type == %u", r_type);
694
uint64_t abs = symbol + addend;
698
assert((uint32_t)abs == abs);
700
case R_AMDGPU_ABS32_LO:
701
*(uint32_t *)dst_ptr = util_cpu_to_le32(abs);
703
case R_AMDGPU_ABS32_HI:
704
*(uint32_t *)dst_ptr = util_cpu_to_le32(abs >> 32);
707
*(uint64_t *)dst_ptr = util_cpu_to_le64(abs);
710
assert((int64_t)(int32_t)(abs - va) == (int64_t)(abs - va));
712
case R_AMDGPU_REL32_LO:
713
*(uint32_t *)dst_ptr = util_cpu_to_le32(abs - va);
715
case R_AMDGPU_REL32_HI:
716
*(uint32_t *)dst_ptr = util_cpu_to_le32((abs - va) >> 32);
719
*(uint64_t *)dst_ptr = util_cpu_to_le64(abs - va);
722
unreachable("bad r_type");
733
* Upload the binary or binaries to the provided GPU buffers, including
736
int ac_rtld_upload(struct ac_rtld_upload_info *u)
738
#define report_if(cond) \
741
report_errorf(#cond); \
745
#define report_elf_if(cond) \
748
report_errorf(#cond); \
754
if (u->binary->options.halt_at_entry) {
756
*(uint32_t *)u->rx_ptr = util_cpu_to_le32(0xbf8d0001);
759
/* First pass: upload raw section data and lay out private LDS symbols. */
760
for (unsigned i = 0; i < u->binary->num_parts; ++i) {
761
struct ac_rtld_part *part = &u->binary->parts[i];
763
Elf_Scn *section = NULL;
764
while ((section = elf_nextscn(part->elf, section))) {
765
Elf64_Shdr *shdr = elf64_getshdr(section);
766
struct ac_rtld_section *s = &part->sections[elf_ndxscn(section)];
771
report_if(shdr->sh_type != SHT_PROGBITS);
773
Elf_Data *data = elf_getdata(section, NULL);
774
report_elf_if(!data || data->d_size != shdr->sh_size);
775
memcpy(u->rx_ptr + s->offset, data->d_buf, shdr->sh_size);
777
size = MAX2(size, s->offset + shdr->sh_size);
781
if (u->binary->rx_end_markers) {
782
uint32_t *dst = (uint32_t *)(u->rx_ptr + u->binary->rx_end_markers);
783
for (unsigned i = 0; i < DEBUGGER_NUM_MARKERS; ++i)
784
*dst++ = util_cpu_to_le32(DEBUGGER_END_OF_CODE_MARKER);
785
size += 4 * DEBUGGER_NUM_MARKERS;
788
/* Second pass: handle relocations, overwriting uploaded data where
790
for (unsigned i = 0; i < u->binary->num_parts; ++i) {
791
struct ac_rtld_part *part = &u->binary->parts[i];
792
Elf_Scn *section = NULL;
793
while ((section = elf_nextscn(part->elf, section))) {
794
Elf64_Shdr *shdr = elf64_getshdr(section);
795
if (shdr->sh_type == SHT_REL) {
796
Elf_Data *relocs = elf_getdata(section, NULL);
797
report_elf_if(!relocs || relocs->d_size != shdr->sh_size);
798
if (!apply_relocs(u, i, shdr, relocs))
800
} else if (shdr->sh_type == SHT_RELA) {
801
report_errorf("SHT_RELA not supported");