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imx: bootaux fix elf loading

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This reverts the arch/arm/mach-imx/imx_bootaux.c changes of commit
805b3cac1e. The loader function name was changed so that it does
not clash with the generically available function in lib/elf.c.

imx-bootaux loads an elf file linked for an auxilary core. Thus the
loader function requires address translation from the auxilary core's
address space to where those are mapped into U-Boot's address space.

So the elf loader is specific and must not be replaced with a generic
loader which doesn't provide the address translation functionality.

Fixes commit 805b3cac1e ("lib: elf: Move the generic elf
loading/validating functions to lib")

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Acked-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
This commit is contained in:
Max Krummenacher 2021-03-11 18:18:07 +01:00 committed by Otavio Salvador
parent 31d5c44206
commit 31cf6b483b
1 changed files with 66 additions and 1 deletions
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67
arch/arm/mach-imx/imx_bootaux.c
View File

@ -14,6 +14,71 @@
#include <linux/compiler.h>
#include <cpu_func.h>
#ifndef CONFIG_IMX8M
const __weak struct rproc_att hostmap[] = { };
static const struct rproc_att *get_host_mapping(unsigned long auxcore)
{
const struct rproc_att *mmap = hostmap;
while (mmap && mmap->size) {
if (mmap->da <= auxcore &&
mmap->da + mmap->size > auxcore)
return mmap;
mmap++;
}
return NULL;
}
/*
* A very simple elf loader for the auxilary core, assumes the image
* is valid, returns the entry point address.
* Translates load addresses in the elf file to the U-Boot address space.
*/
static unsigned long load_elf_image_m_core_phdr(unsigned long addr)
{
Elf32_Ehdr *ehdr; /* ELF header structure pointer */
Elf32_Phdr *phdr; /* Program header structure pointer */
int i;
ehdr = (Elf32_Ehdr *)addr;
phdr = (Elf32_Phdr *)(addr + ehdr->e_phoff);
/* Load each program header */
for (i = 0; i < ehdr->e_phnum; ++i, ++phdr) {
const struct rproc_att *mmap = get_host_mapping(phdr->p_paddr);
void *dst, *src;
if (phdr->p_type != PT_LOAD)
continue;
if (!mmap) {
printf("Invalid aux core address: %08x",
phdr->p_paddr);
return 0;
}
dst = (void *)(phdr->p_paddr - mmap->da) + mmap->sa;
src = (void *)addr + phdr->p_offset;
debug("Loading phdr %i to 0x%p (%i bytes)\n",
i, dst, phdr->p_filesz);
if (phdr->p_filesz)
memcpy(dst, src, phdr->p_filesz);
if (phdr->p_filesz != phdr->p_memsz)
memset(dst + phdr->p_filesz, 0x00,
phdr->p_memsz - phdr->p_filesz);
flush_cache((unsigned long)dst &
~(CONFIG_SYS_CACHELINE_SIZE - 1),
ALIGN(phdr->p_filesz, CONFIG_SYS_CACHELINE_SIZE));
}
return ehdr->e_entry;
}
#endif
int arch_auxiliary_core_up(u32 core_id, ulong addr)
{
ulong stack, pc;
@ -31,7 +96,7 @@ int arch_auxiliary_core_up(u32 core_id, ulong addr)
*/
if (valid_elf_image(addr)) {
stack = 0x0;
pc = load_elf_image_phdr(addr);
pc = load_elf_image_m_core_phdr(addr);
if (!pc)
return CMD_RET_FAILURE;