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llext: refactor section copying

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Instead of first allocating all sections and then copying then,
create a helper function to allocate and copy a single section and
call it for all appropriate sections. We need to call this function
from another location when copying string sections.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
This commit is contained in:
Guennadi Liakhovetski 2023-10-25 15:19:00 +02:00 • committed by Carles Cufí
commit 23472509d3
1 changed files with 32 additions and 42 deletions
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72
subsys/llext/llext.c
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@ -236,55 +236,52 @@ static inline enum llext_section llext_sect_from_mem(enum llext_mem m)
return s;
}
static int llext_allocate_mem(struct llext_loader *ldr, struct llext *ext)
static int llext_copy_section(struct llext_loader *ldr, struct llext *ext,
enum llext_mem mem_idx)
{
int ret = 0;
enum llext_section sect_idx;
enum llext_section sect_idx = llext_sect_from_mem(mem_idx);
int ret;
for (enum llext_mem mem_idx = 0; mem_idx < LLEXT_MEM_COUNT; mem_idx++) {
sect_idx = llext_sect_from_mem(mem_idx);
if (!ldr->sects[sect_idx].sh_size) {
return 0;
}
if (ldr->sects[sect_idx].sh_size > 0) {
ext->mem[mem_idx] =
k_heap_aligned_alloc(&llext_heap, sizeof(uintptr_t),
ext->mem[mem_idx] = k_heap_aligned_alloc(&llext_heap, sizeof(uintptr_t),
ldr->sects[sect_idx].sh_size,
K_NO_WAIT);
if (ext->mem[mem_idx] == NULL) {
ret = -ENOMEM;
goto out;
}
}
if (!ext->mem[mem_idx]) {
return -ENOMEM;
}
out:
ret = llext_seek(ldr, ldr->sects[sect_idx].sh_offset);
if (ret != 0) {
goto err;
}
ret = llext_read(ldr, ext->mem[mem_idx], ldr->sects[sect_idx].sh_size);
if (ret != 0) {
goto err;
}
return 0;
err:
k_heap_free(&llext_heap, ext->mem[mem_idx]);
return ret;
}
static int llext_copy_sections(struct llext_loader *ldr, struct llext *ext)
{
int ret = 0;
enum llext_section sect_idx;
for (enum llext_mem mem_idx = 0; mem_idx < LLEXT_MEM_COUNT; mem_idx++) {
sect_idx = llext_sect_from_mem(mem_idx);
int ret = llext_copy_section(ldr, ext, mem_idx);
if (ldr->sects[sect_idx].sh_size > 0) {
ret = llext_seek(ldr, ldr->sects[sect_idx].sh_offset);
if (ret != 0) {
goto out;
}
ret = llext_read(ldr, ext->mem[mem_idx], ldr->sects[sect_idx].sh_size);
if (ret != 0) {
goto out;
}
}
}
out:
if (ret < 0) {
return ret;
}
}
return 0;
}
static int llext_count_export_syms(struct llext_loader *ldr)
{
@ -593,14 +590,7 @@ static int do_llext_load(struct llext_loader *ldr, struct llext *ext)
goto out;
}
LOG_DBG("Allocation memory for ELF sections...");
ret = llext_allocate_mem(ldr, ext);
if (ret != 0) {
LOG_ERR("Failed to map memory for ELF sections, ret %d", ret);
goto out;
}
LOG_DBG("Copying sections...");
LOG_DBG("Allocate and copy sections...");
ret = llext_copy_sections(ldr, ext);
if (ret != 0) {
LOG_ERR("Failed to copy ELF sections, ret %d", ret);