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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2024 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#include <gzip.h>
#include <image.h>
#include <log.h>
#include <mapmem.h>
#include <spl.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <asm/sections.h>
#include <asm/unaligned.h>
#include <linux/types.h>
#include <lzma/LzmaTypes.h>
#include <lzma/LzmaDec.h>
#include <lzma/LzmaTools.h>
#include <u-boot/crc.h>
#include <u-boot/lz4.h>
DECLARE_GLOBAL_DATA_PTR;
/* provide a way to jump straight into the relocation code, for debugging */
#define DEBUG_JUMP 0
enum {
/* margin to allow for stack growth */
RELOC_STACK_MARGIN = 0x800,
/* align base address for DMA controllers which require it */
BASE_ALIGN = 0x200,
STACK_PROT_VALUE = 0x51ce4697,
};
typedef int (*rcode_func)(struct spl_image_info *image);
static int setup_layout(struct spl_image_info *image, ulong *addrp)
{
ulong base, fdt_size;
ulong limit, rcode_base;
uint rcode_size;
int buf_size, margin;
char *rcode_buf;
limit = ALIGN(map_to_sysmem(&limit) - RELOC_STACK_MARGIN, 8);
image->stack_prot = map_sysmem(limit, sizeof(uint));
*image->stack_prot = STACK_PROT_VALUE;
fdt_size = fdt_totalsize(gd->fdt_blob);
base = ALIGN(map_to_sysmem(gd->fdt_blob) + fdt_size + BASE_ALIGN - 1,
BASE_ALIGN);
rcode_size = _rcode_end - _rcode_start;
rcode_base = limit - rcode_size;
buf_size = rcode_base - base;
uint need_size = image->size + image->fdt_size;
margin = buf_size - need_size;
log_debug("spl_reloc %s->%s: margin%s%lx limit %lx fdt_size %lx base %lx avail %x image %x fdt %lx need %x\n",
spl_phase_name(spl_phase()), spl_phase_name(spl_phase() + 1),
margin >= 0 ? " " : " -", abs(margin), limit, fdt_size, base,
buf_size, image->size, image->fdt_size, need_size);
if (margin < 0) {
log_err("Image size %x but buffer is only %x\n", need_size,
buf_size);
return -ENOSPC;
}
rcode_buf = map_sysmem(rcode_base, rcode_size);
log_debug("_rcode_start %p: %x -- func %p %x\n", _rcode_start,
*(uint *)_rcode_start, setup_layout, *(uint *)setup_layout);
image->reloc_offset = rcode_buf - _rcode_start;
log_debug("_rcode start %lx base %lx size %x offset %lx\n",
(ulong)map_to_sysmem(_rcode_start), rcode_base, rcode_size,
image->reloc_offset);
memcpy(rcode_buf, _rcode_start, rcode_size);
image->buf = map_sysmem(base, need_size);
image->fdt_buf = image->buf + image->size;
image->rcode_buf = rcode_buf;
*addrp = base;
return 0;
}
int spl_reloc_prepare(struct spl_image_info *image, ulong *addrp)
{
int ret;
ret = setup_layout(image, addrp);
if (ret)
return ret;
return 0;
}
typedef void __noreturn (*image_entry_noargs_t)(uint crc, uint unc_len);
/* this is the relocation + jump code that is copied to the top of memory */
__rcode int rcode_reloc_and_jump(struct spl_image_info *image)
{
image_entry_noargs_t entry = (image_entry_noargs_t)image->entry_point;
u32 *dst;
ulong image_len;
size_t unc_len;
int ret, crc;
uint magic;
dst = map_sysmem(image->load_addr, image->size);
unc_len = (void *)image->rcode_buf - (void *)dst;
image_len = image->size;
if (*image->stack_prot != STACK_PROT_VALUE)
return -EFAULT;
magic = get_unaligned_le32(image->buf);
if (CONFIG_IS_ENABLED(LZMA)) {
SizeT lzma_len = unc_len;
ret = lzmaBuffToBuffDecompress((u8 *)dst, &lzma_len,
image->buf, image_len);
unc_len = lzma_len;
} else if (CONFIG_IS_ENABLED(GZIP)) {
ret = gunzip(dst, unc_len, image->buf, &image_len);
} else if (CONFIG_IS_ENABLED(LZ4) && magic == LZ4F_MAGIC) {
ret = ulz4fn(image->buf, image_len, dst, &unc_len);
if (ret)
return ret;
} else {
u32 *src, *end, *ptr;
unc_len = image->size;
for (src = image->buf, end = (void *)src + image->size,
ptr = dst; src < end;)
*ptr++ = *src++;
}
if (*image->stack_prot != STACK_PROT_VALUE)
return -EFAULT;
/* copy in the FDT if needed */
if (image->fdt_size)
memcpy(image->fdt_start, image->fdt_buf, image->fdt_size);
crc = crc8(0, (u8 *)dst, unc_len);
/* jump to the entry point */
entry(crc, unc_len);
}
int spl_reloc_jump(struct spl_image_info *image, spl_jump_to_image_t jump)
{
rcode_func loader;
int ret;
log_debug("malloc usage %x bytes (%d KB of %d KB)\n", gd->malloc_ptr,
gd->malloc_ptr / 1024, CONFIG_VAL(SYS_MALLOC_F_LEN) / 1024);
if (*image->stack_prot != STACK_PROT_VALUE) {
log_err("stack busted, cannot continue\n");
return -EFAULT;
}
loader = (rcode_func)(void *)rcode_reloc_and_jump + image->reloc_offset;
log_debug("Jumping via %p to %lx - image %p size %x load %lx\n", loader,
image->entry_point, image, image->size, image->load_addr);
log_debug("unc_len %lx\n",
image->rcode_buf - map_sysmem(image->load_addr, image->size));
if (DEBUG_JUMP) {
rcode_reloc_and_jump(image);
} else {
/*
* Must disable LOG_DEBUG since the decompressor cannot call
* log functions, printf(), etc.
*/
_Static_assert(DEBUG_JUMP || !_DEBUG,
"Cannot have debug output from decompressor");
ret = loader(image);
}
return -EFAULT;
}
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