/*
* Copyright 2014-2019 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.
*/
#include "ac_rtld.h"
#include "ac_binary.h"
#include "ac_gpu_info.h"
#include "util/compiler.h"
#include "util/u_dynarray.h"
#include "util/u_math.h"
#include <gelf.h>
#include <libelf.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef EM_AMDGPU
// Old distributions may not have this enum constant
#define EM_AMDGPU 224
#endif
#ifndef STT_AMDGPU_LDS
#define STT_AMDGPU_LDS 13 // this is deprecated -- remove
#endif
#ifndef SHN_AMDGPU_LDS
#define SHN_AMDGPU_LDS 0xff00
#endif
#ifndef R_AMDGPU_NONE
#define R_AMDGPU_NONE 0
#define R_AMDGPU_ABS32_LO 1
#define R_AMDGPU_ABS32_HI 2
#define R_AMDGPU_ABS64 3
#define R_AMDGPU_REL32 4
#define R_AMDGPU_REL64 5
#define R_AMDGPU_ABS32 6
#define R_AMDGPU_GOTPCREL 7
#define R_AMDGPU_GOTPCREL32_LO 8
#define R_AMDGPU_GOTPCREL32_HI 9
#define R_AMDGPU_REL32_LO 10
#define R_AMDGPU_REL32_HI 11
#define R_AMDGPU_RELATIVE64 13
#endif
/* For the UMR disassembler. */
#define DEBUGGER_END_OF_CODE_MARKER 0xbf9f0000 /* invalid instruction */
#define DEBUGGER_NUM_MARKERS 5
struct ac_rtld_section {
bool is_rx : 1;
bool is_pasted_text : 1;
uint64_t offset;
const char *name;
};
struct ac_rtld_part {
Elf *elf;
struct ac_rtld_section *sections;
unsigned num_sections;
};
static void report_errorvf(const char *fmt, va_list va)
{
fprintf(stderr, "ac_rtld error: ");
vfprintf(stderr, fmt, va);
fprintf(stderr, "\n");
}
static void report_errorf(const char *fmt, ...) PRINTFLIKE(1, 2);
static void report_errorf(const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
report_errorvf(fmt, va);
va_end(va);
}
static void report_elf_errorf(const char *fmt, ...) PRINTFLIKE(1, 2);
static void report_elf_errorf(const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
report_errorvf(fmt, va);
va_end(va);
fprintf(stderr, "ELF error: %s\n", elf_errmsg(elf_errno()));
}
/**
* Find a symbol in a dynarray of struct ac_rtld_symbol by \p name and shader
* \p part_idx.
*/
static const struct ac_rtld_symbol *find_symbol(const struct util_dynarray *symbols,
const char *name, unsigned part_idx)
{
util_dynarray_foreach (symbols, struct ac_rtld_symbol, symbol) {
if ((symbol->part_idx == ~0u || symbol->part_idx == part_idx) && !strcmp(name, symbol->name))
return symbol;
}
return 0;
}
static int compare_symbol_by_align(const void *lhsp, const void *rhsp)
{
const struct ac_rtld_symbol *lhs = lhsp;
const struct ac_rtld_symbol *rhs = rhsp;
if (rhs->align > lhs->align)
return 1;
if (rhs->align < lhs->align)
return -1;
return 0;
}
/**
* Sort the given symbol list by decreasing alignment and assign offsets.
*/
static bool layout_symbols(struct ac_rtld_symbol *symbols, unsigned num_symbols,
uint64_t *ptotal_size)
{
qsort(symbols, num_symbols, sizeof(*symbols), compare_symbol_by_align);
uint64_t total_size = *ptotal_size;
for (unsigned i = 0; i < num_symbols; ++i) {
struct ac_rtld_symbol *s = &symbols[i];
assert(util_is_power_of_two_nonzero(s->align));
total_size = align64(total_size, s->align);
s->offset = total_size;
if (total_size + s->size < total_size) {
report_errorf("%s: size overflow", __FUNCTION__);
return false;
}
total_size += s->size;
}
*ptotal_size = total_size;
return true;
}
/**
* Read LDS symbols from the given \p section of the ELF of \p part and append
* them to the LDS symbols list.
*
* Shared LDS symbols are filtered out.
*/
static bool read_private_lds_symbols(struct ac_rtld_binary *binary, unsigned part_idx,
Elf_Scn *section, uint32_t *lds_end_align)
{
#define report_if(cond) \
do { \
if ((cond)) { \
report_errorf(#cond); \
return false; \
} \
} while (false)
#define report_elf_if(cond) \
do { \
if ((cond)) { \
report_elf_errorf(#cond); \
return false; \
} \
} while (false)
struct ac_rtld_part *part = &binary->parts[part_idx];
Elf64_Shdr *shdr = elf64_getshdr(section);
uint32_t strtabidx = shdr->sh_link;
Elf_Data *symbols_data = elf_getdata(section, NULL);
report_elf_if(!symbols_data);
const Elf64_Sym *symbol = symbols_data->d_buf;
size_t num_symbols = symbols_data->d_size / sizeof(Elf64_Sym);
for (size_t j = 0; j < num_symbols; ++j, ++symbol) {
struct ac_rtld_symbol s = {0};
if (ELF64_ST_TYPE(symbol->st_info) == STT_AMDGPU_LDS) {
/* old-style LDS symbols from initial prototype -- remove eventually */
s.align = MIN2(1u << (symbol->st_other >> 3), 1u << 16);
} else if (symbol->st_shndx == SHN_AMDGPU_LDS) {
s.align = MIN2(symbol->st_value, 1u << 16);
report_if(!util_is_power_of_two_nonzero(s.align));
} else
continue;
report_if(symbol->st_size > 1u << 29);
s.name = elf_strptr(part->elf, strtabidx, symbol->st_name);
s.size = symbol->st_size;
s.part_idx = part_idx;
if (!strcmp(s.name, "__lds_end")) {
report_elf_if(s.size != 0);
*lds_end_align = MAX2(*lds_end_align, s.align);
continue;
}
const struct ac_rtld_symbol *shared = find_symbol(&binary->lds_symbols, s.name, part_idx);
if (shared) {
report_elf_if(s.align > shared->align);
report_elf_if(s.size > shared->size);
continue;
}
util_dynarray_append(&binary->lds_symbols, struct ac_rtld_symbol, s);
}
return true;
#undef report_if
#undef report_elf_if
}
/**
* Open a binary consisting of one or more shader parts.
*
* \param binary the uninitialized struct
* \param i binary opening parameters
*/
bool ac_rtld_open(struct ac_rtld_binary *binary, struct ac_rtld_open_info i)
{
/* One of the libelf implementations
* (http://www.mr511.de/software/english.htm) requires calling
* elf_version() before elf_memory().
*/
elf_version(EV_CURRENT);
memset(binary, 0, sizeof(*binary));
memcpy(&binary->options, &i.options, sizeof(binary->options));
binary->wave_size = i.wave_size;
binary->num_parts = i.num_parts;
binary->parts = calloc(sizeof(*binary->parts), i.num_parts);
if (!binary->parts)
return false;
uint64_t pasted_text_size = 0;
uint64_t rx_align = 1;
uint64_t rx_size = 0;
uint64_t exec_size = 0;
#define report_if(cond) \
do { \
if ((cond)) { \
report_errorf(#cond); \
goto fail; \
} \
} while (false)
#define report_elf_if(cond) \
do { \
if ((cond)) { \
report_elf_errorf(#cond); \
goto fail; \
} \
} while (false)
/* Copy and layout shared LDS symbols. */
if (i.num_shared_lds_symbols) {
if (!util_dynarray_resize(&binary->lds_symbols, struct ac_rtld_symbol,
i.num_shared_lds_symbols))
goto fail;
memcpy(binary->lds_symbols.data, i.shared_lds_symbols, binary->lds_symbols.size);
}
util_dynarray_foreach (&binary->lds_symbols, struct ac_rtld_symbol, symbol)
symbol->part_idx = ~0u;
unsigned max_lds_size = 64 * 1024;
if (i.info->chip_class == GFX6 ||
(i.shader_type != MESA_SHADER_COMPUTE && i.shader_type != MESA_SHADER_FRAGMENT))
max_lds_size = 32 * 1024;
uint64_t shared_lds_size = 0;
if (!layout_symbols(binary->lds_symbols.data, i.num_shared_lds_symbols, &shared_lds_size))
goto fail;
if (shared_lds_size > max_lds_size) {
fprintf(stderr, "ac_rtld error(1): too much LDS (used = %u, max = %u)\n",
(unsigned)shared_lds_size, max_lds_size);
goto fail;
}
binary->lds_size = shared_lds_size;
/* First pass over all parts: open ELFs, pre-determine the placement of
* sections in the memory image, and collect and layout private LDS symbols. */
uint32_t lds_end_align = 0;
if (binary->options.halt_at_entry)
pasted_text_size += 4;
for (unsigned part_idx = 0; part_idx < i.num_parts; ++part_idx) {
struct ac_rtld_part *part = &binary->parts[part_idx];
unsigned part_lds_symbols_begin =
util_dynarray_num_elements(&binary->lds_symbols, struct ac_rtld_symbol);
part->elf = elf_memory((char *)i.elf_ptrs[part_idx], i.elf_sizes[part_idx]);
report_elf_if(!part->elf);
const Elf64_Ehdr *ehdr = elf64_getehdr(part->elf);
report_elf_if(!ehdr);
report_if(ehdr->e_machine != EM_AMDGPU);
size_t section_str_index;
size_t num_shdrs;
report_elf_if(elf_getshdrstrndx(part->elf, §ion_str_index) < 0);
report_elf_if(elf_getshdrnum(part->elf, &num_shdrs) < 0);
part->num_sections = num_shdrs;
part->sections = calloc(sizeof(*part->sections), num_shdrs);
report_if(!part->sections);
Elf_Scn *section = NULL;
while ((section = elf_nextscn(part->elf, section))) {
Elf64_Shdr *shdr = elf64_getshdr(section);
struct ac_rtld_section *s = &part->sections[elf_ndxscn(section)];
s->name = elf_strptr(part->elf, section_str_index, shdr->sh_name);
report_elf_if(!s->name);
/* Cannot actually handle linked objects yet */
report_elf_if(shdr->sh_addr != 0);
/* Alignment must be 0 or a power of two */
report_elf_if(shdr->sh_addralign & (shdr->sh_addralign - 1));
uint64_t sh_align = MAX2(shdr->sh_addralign, 1);
if (shdr->sh_flags & SHF_ALLOC && shdr->sh_type != SHT_NOTE) {
report_if(shdr->sh_flags & SHF_WRITE);
s->is_rx = true;
if (shdr->sh_flags & SHF_EXECINSTR) {
report_elf_if(shdr->sh_size & 3);
if (!strcmp(s->name, ".text"))
s->is_pasted_text = true;
exec_size += shdr->sh_size;
}
if (s->is_pasted_text) {
s->offset = pasted_text_size;
pasted_text_size += shdr->sh_size;
} else {
rx_align = align(rx_align, sh_align);
rx_size = align(rx_size, sh_align);
s->offset = rx_size;
rx_size += shdr->sh_size;
}
} else if (shdr->sh_type == SHT_SYMTAB) {
if (!read_private_lds_symbols(binary, part_idx, section, &lds_end_align))
goto fail;
}
}
uint64_t part_lds_size = shared_lds_size;
if (!layout_symbols(util_dynarray_element(&binary->lds_symbols, struct ac_rtld_symbol,
part_lds_symbols_begin),
util_dynarray_num_elements(&binary->lds_symbols, struct ac_rtld_symbol) -
part_lds_symbols_begin,
&part_lds_size))
goto fail;
binary->lds_size = MAX2(binary->lds_size, part_lds_size);
}
binary->rx_end_markers = pasted_text_size;
pasted_text_size += 4 * DEBUGGER_NUM_MARKERS;
/* __lds_end is a special symbol that points at the end of the memory
* occupied by other LDS symbols. Its alignment is taken as the
* maximum of its alignment over all shader parts where it occurs.
*/
if (lds_end_align) {
binary->lds_size = align(binary->lds_size, lds_end_align);
struct ac_rtld_symbol *lds_end =
util_dynarray_grow(&binary->lds_symbols, struct ac_rtld_symbol, 1);
lds_end->name = "__lds_end";
lds_end->size = 0;
lds_end->align = lds_end_align;
lds_end->offset = binary->lds_size;
lds_end->part_idx = ~0u;
}
if (binary->lds_size > max_lds_size) {
fprintf(stderr, "ac_rtld error(2): too much LDS (used = %u, max = %u)\n",
(unsigned)binary->lds_size, max_lds_size);
goto fail;
}
/* Second pass: Adjust offsets of non-pasted text sections. */
binary->rx_size = pasted_text_size;
binary->rx_size = align(binary->rx_size, rx_align);
for (unsigned part_idx = 0; part_idx < i.num_parts; ++part_idx) {
struct ac_rtld_part *part = &binary->parts[part_idx];
size_t num_shdrs;
elf_getshdrnum(part->elf, &num_shdrs);
for (unsigned j = 0; j < num_shdrs; ++j) {
struct ac_rtld_section *s = &part->sections[j];
if (s->is_rx && !s->is_pasted_text)
s->offset += binary->rx_size;
}
}
binary->rx_size += rx_size;
binary->exec_size = exec_size;
/* The SQ fetches up to N cache lines of 16 dwords
* ahead of the PC, configurable by SH_MEM_CONFIG and
* S_INST_PREFETCH. This can cause two issues:
*
* (1) Crossing a page boundary to an unmapped page. The logic
* does not distinguish between a required fetch and a "mere"
* prefetch and will fault.
*
* (2) Prefetching instructions that will be changed for a
* different shader.
*
* (2) is not currently an issue because we flush the I$ at IB
* boundaries, but (1) needs to be addressed. Due to buffer
* suballocation, we just play it safe.
*/
unsigned prefetch_distance = 0;
if (!i.info->has_graphics && i.info->family >= CHIP_ALDEBARAN)
prefetch_distance = 16;
else if (i.info->chip_class >= GFX10)
prefetch_distance = 3;
if (prefetch_distance)
binary->rx_size = align(binary->rx_size + prefetch_distance * 64, 64);
return true;
#undef report_if
#undef report_elf_if
fail:
ac_rtld_close(binary);
return false;
}
void ac_rtld_close(struct ac_rtld_binary *binary)
{
for (unsigned i = 0; i < binary->num_parts; ++i) {
struct ac_rtld_part *part = &binary->parts[i];
free(part->sections);
elf_end(part->elf);
}
util_dynarray_fini(&binary->lds_symbols);
free(binary->parts);
binary->parts = NULL;
binary->num_parts = 0;
}
static bool get_section_by_name(struct ac_rtld_part *part, const char *name, const char **data,
size_t *nbytes)
{
for (unsigned i = 0; i < part->num_sections; ++i) {
struct ac_rtld_section *s = &part->sections[i];
if (s->name && !strcmp(name, s->name)) {
Elf_Scn *target_scn = elf_getscn(part->elf, i);
Elf_Data *target_data = elf_getdata(target_scn, NULL);
if (!target_data) {
report_elf_errorf("ac_rtld: get_section_by_name: elf_getdata");
return false;
}
*data = target_data->d_buf;
*nbytes = target_data->d_size;
return true;
}
}
return false;
}
bool ac_rtld_get_section_by_name(struct ac_rtld_binary *binary, const char *name, const char **data,
size_t *nbytes)
{
assert(binary->num_parts == 1);
return get_section_by_name(&binary->parts[0], name, data, nbytes);
}
bool ac_rtld_read_config(const struct radeon_info *info, struct ac_rtld_binary *binary,
struct ac_shader_config *config)
{
for (unsigned i = 0; i < binary->num_parts; ++i) {
struct ac_rtld_part *part = &binary->parts[i];
const char *config_data;
size_t config_nbytes;
if (!get_section_by_name(part, ".AMDGPU.config", &config_data, &config_nbytes))
return false;
/* TODO: be precise about scratch use? */
struct ac_shader_config c = {0};
ac_parse_shader_binary_config(config_data, config_nbytes, binary->wave_size, true, info, &c);
config->num_sgprs = MAX2(config->num_sgprs, c.num_sgprs);
config->num_vgprs = MAX2(config->num_vgprs, c.num_vgprs);
config->spilled_sgprs = MAX2(config->spilled_sgprs, c.spilled_sgprs);
config->spilled_vgprs = MAX2(config->spilled_vgprs, c.spilled_vgprs);
config->scratch_bytes_per_wave =
MAX2(config->scratch_bytes_per_wave, c.scratch_bytes_per_wave);
assert(i == 0 || config->float_mode == c.float_mode);
config->float_mode = c.float_mode;
/* SPI_PS_INPUT_ENA/ADDR can't be combined. Only the value from
* the main shader part is used. */
assert(config->spi_ps_input_ena == 0 && config->spi_ps_input_addr == 0);
config->spi_ps_input_ena = c.spi_ps_input_ena;
config->spi_ps_input_addr = c.spi_ps_input_addr;
/* TODO: consistently use LDS symbols for this */
config->lds_size = MAX2(config->lds_size, c.lds_size);
/* TODO: Should we combine these somehow? It's currently only
* used for radeonsi's compute, where multiple parts aren't used. */
assert(config->rsrc1 == 0 && config->rsrc2 == 0);
config->rsrc1 = c.rsrc1;
config->rsrc2 = c.rsrc2;
}
return true;
}
static bool resolve_symbol(const struct ac_rtld_upload_info *u, unsigned part_idx,
const Elf64_Sym *sym, const char *name, uint64_t *value)
{
/* TODO: properly disentangle the undef and the LDS cases once
* STT_AMDGPU_LDS is retired. */
if (sym->st_shndx == SHN_UNDEF || sym->st_shndx == SHN_AMDGPU_LDS) {
const struct ac_rtld_symbol *lds_sym = find_symbol(&u->binary->lds_symbols, name, part_idx);
if (lds_sym) {
*value = lds_sym->offset;
return true;
}
/* TODO: resolve from other parts */
if (u->get_external_symbol(u->cb_data, name, value))
return true;
report_errorf("symbol %s: unknown", name);
return false;
}
struct ac_rtld_part *part = &u->binary->parts[part_idx];
if (sym->st_shndx >= part->num_sections) {
report_errorf("symbol %s: section out of bounds", name);
return false;
}
struct ac_rtld_section *s = &part->sections[sym->st_shndx];
if (!s->is_rx) {
report_errorf("symbol %s: bad section", name);
return false;
}
uint64_t section_base = u->rx_va + s->offset;
*value = section_base + sym->st_value;
return true;
}
static bool apply_relocs(const struct ac_rtld_upload_info *u, unsigned part_idx,
const Elf64_Shdr *reloc_shdr, const Elf_Data *reloc_data)
{
#define report_if(cond) \
do { \
if ((cond)) { \
report_errorf(#cond); \
return false; \
} \
} while (false)
#define report_elf_if(cond) \
do { \
if ((cond)) { \
report_elf_errorf(#cond); \
return false; \
} \
} while (false)
struct ac_rtld_part *part = &u->binary->parts[part_idx];
Elf_Scn *target_scn = elf_getscn(part->elf, reloc_shdr->sh_info);
report_elf_if(!target_scn);
Elf_Data *target_data = elf_getdata(target_scn, NULL);
report_elf_if(!target_data);
Elf_Scn *symbols_scn = elf_getscn(part->elf, reloc_shdr->sh_link);
report_elf_if(!symbols_scn);
Elf64_Shdr *symbols_shdr = elf64_getshdr(symbols_scn);
report_elf_if(!symbols_shdr);
uint32_t strtabidx = symbols_shdr->sh_link;
Elf_Data *symbols_data = elf_getdata(symbols_scn, NULL);
report_elf_if(!symbols_data);
const Elf64_Sym *symbols = symbols_data->d_buf;
size_t num_symbols = symbols_data->d_size / sizeof(Elf64_Sym);
struct ac_rtld_section *s = &part->sections[reloc_shdr->sh_info];
report_if(!s->is_rx);
const char *orig_base = target_data->d_buf;
char *dst_base = u->rx_ptr + s->offset;
uint64_t va_base = u->rx_va + s->offset;
Elf64_Rel *rel = reloc_data->d_buf;
size_t num_relocs = reloc_data->d_size / sizeof(*rel);
for (size_t i = 0; i < num_relocs; ++i, ++rel) {
size_t r_sym = ELF64_R_SYM(rel->r_info);
unsigned r_type = ELF64_R_TYPE(rel->r_info);
const char *orig_ptr = orig_base + rel->r_offset;
char *dst_ptr = dst_base + rel->r_offset;
uint64_t va = va_base + rel->r_offset;
uint64_t symbol;
uint64_t addend;
if (r_sym == STN_UNDEF) {
symbol = 0;
} else {
report_elf_if(r_sym >= num_symbols);
const Elf64_Sym *sym = &symbols[r_sym];
const char *symbol_name = elf_strptr(part->elf, strtabidx, sym->st_name);
report_elf_if(!symbol_name);
if (!resolve_symbol(u, part_idx, sym, symbol_name, &symbol))
return false;
}
/* TODO: Should we also support .rela sections, where the
* addend is part of the relocation record? */
/* Load the addend from the ELF instead of the destination,
* because the destination may be in VRAM. */
switch (r_type) {
case R_AMDGPU_ABS32:
case R_AMDGPU_ABS32_LO:
case R_AMDGPU_ABS32_HI:
case R_AMDGPU_REL32:
case R_AMDGPU_REL32_LO:
case R_AMDGPU_REL32_HI:
addend = *(const uint32_t *)orig_ptr;
break;
case R_AMDGPU_ABS64:
case R_AMDGPU_REL64:
addend = *(const uint64_t *)orig_ptr;
break;
default:
report_errorf("unsupported r_type == %u", r_type);
return false;
}
uint64_t abs = symbol + addend;
switch (r_type) {
case R_AMDGPU_ABS32:
assert((uint32_t)abs == abs);
FALLTHROUGH;
case R_AMDGPU_ABS32_LO:
*(uint32_t *)dst_ptr = util_cpu_to_le32(abs);
break;
case R_AMDGPU_ABS32_HI:
*(uint32_t *)dst_ptr = util_cpu_to_le32(abs >> 32);
break;
case R_AMDGPU_ABS64:
*(uint64_t *)dst_ptr = util_cpu_to_le64(abs);
break;
case R_AMDGPU_REL32:
assert((int64_t)(int32_t)(abs - va) == (int64_t)(abs - va));
FALLTHROUGH;
case R_AMDGPU_REL32_LO:
*(uint32_t *)dst_ptr = util_cpu_to_le32(abs - va);
break;
case R_AMDGPU_REL32_HI:
*(uint32_t *)dst_ptr = util_cpu_to_le32((abs - va) >> 32);
break;
case R_AMDGPU_REL64:
*(uint64_t *)dst_ptr = util_cpu_to_le64(abs - va);
break;
default:
unreachable("bad r_type");
}
}
return true;
#undef report_if
#undef report_elf_if
}
/**
* Upload the binary or binaries to the provided GPU buffers, including
* relocations.
*/
int ac_rtld_upload(struct ac_rtld_upload_info *u)
{
#define report_if(cond) \
do { \
if ((cond)) { \
report_errorf(#cond); \
return -1; \
} \
} while (false)
#define report_elf_if(cond) \
do { \
if ((cond)) { \
report_errorf(#cond); \
return -1; \
} \
} while (false)
int size = 0;
if (u->binary->options.halt_at_entry) {
/* s_sethalt 1 */
*(uint32_t *)u->rx_ptr = util_cpu_to_le32(0xbf8d0001);
}
/* First pass: upload raw section data and lay out private LDS symbols. */
for (unsigned i = 0; i < u->binary->num_parts; ++i) {
struct ac_rtld_part *part = &u->binary->parts[i];
Elf_Scn *section = NULL;
while ((section = elf_nextscn(part->elf, section))) {
Elf64_Shdr *shdr = elf64_getshdr(section);
struct ac_rtld_section *s = &part->sections[elf_ndxscn(section)];
if (!s->is_rx)
continue;
report_if(shdr->sh_type != SHT_PROGBITS);
Elf_Data *data = elf_getdata(section, NULL);
report_elf_if(!data || data->d_size != shdr->sh_size);
memcpy(u->rx_ptr + s->offset, data->d_buf, shdr->sh_size);
size = MAX2(size, s->offset + shdr->sh_size);
}
}
if (u->binary->rx_end_markers) {
uint32_t *dst = (uint32_t *)(u->rx_ptr + u->binary->rx_end_markers);
for (unsigned i = 0; i < DEBUGGER_NUM_MARKERS; ++i)
*dst++ = util_cpu_to_le32(DEBUGGER_END_OF_CODE_MARKER);
size += 4 * DEBUGGER_NUM_MARKERS;
}
/* Second pass: handle relocations, overwriting uploaded data where
* appropriate. */
for (unsigned i = 0; i < u->binary->num_parts; ++i) {
struct ac_rtld_part *part = &u->binary->parts[i];
Elf_Scn *section = NULL;
while ((section = elf_nextscn(part->elf, section))) {
Elf64_Shdr *shdr = elf64_getshdr(section);
if (shdr->sh_type == SHT_REL) {
Elf_Data *relocs = elf_getdata(section, NULL);
report_elf_if(!relocs || relocs->d_size != shdr->sh_size);
if (!apply_relocs(u, i, shdr, relocs))
return -1;
} else if (shdr->sh_type == SHT_RELA) {
report_errorf("SHT_RELA not supported");
return -1;
}
}
}
return size;
#undef report_if
#undef report_elf_if
}