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elf2dmp: introduce physical block alignment

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Physical memory ranges may not be aligned to page size in QEMU ELF, but
DMP can only contain page-aligned runs. So, align them.

Signed-off-by: Viktor Prutyanov <viktor@daynix.com>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-id: 20230915170153.10959-3-viktor@daynix.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Viktor Prutyanov 2023-09-15 20:01:50 +03:00 committed by Peter Maydell
parent 3c407ec67f
commit d5c27a53d5
3 changed files with 33 additions and 4 deletions
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31
contrib/elf2dmp/addrspace.c
View file

@ -14,7 +14,7 @@ static struct pa_block *pa_space_find_block(struct pa_space *ps, uint64_t pa)
for (i = 0; i < ps->block_nr; i++) {
if (ps->block[i].paddr <= pa &&
pa <= ps->block[i].paddr + ps->block[i].size) {
pa < ps->block[i].paddr + ps->block[i].size) {
return ps->block + i;
}
}
@ -33,6 +33,30 @@ static uint8_t *pa_space_resolve(struct pa_space *ps, uint64_t pa)
return block->addr + (pa - block->paddr);
}
static void pa_block_align(struct pa_block *b)
{
uint64_t low_align = ((b->paddr - 1) | ELF2DMP_PAGE_MASK) + 1 - b->paddr;
uint64_t high_align = (b->paddr + b->size) & ELF2DMP_PAGE_MASK;
if (low_align == 0 && high_align == 0) {
return;
}
if (low_align + high_align < b->size) {
printf("Block 0x%"PRIx64"+:0x%"PRIx64" will be aligned to "
"0x%"PRIx64"+:0x%"PRIx64"\n", b->paddr, b->size,
b->paddr + low_align, b->size - low_align - high_align);
b->size -= low_align + high_align;
} else {
printf("Block 0x%"PRIx64"+:0x%"PRIx64" is too small to align\n",
b->paddr, b->size);
b->size = 0;
}
b->addr += low_align;
b->paddr += low_align;
}
int pa_space_create(struct pa_space *ps, QEMU_Elf *qemu_elf)
{
Elf64_Half phdr_nr = elf_getphdrnum(qemu_elf->map);
@ -60,10 +84,13 @@ int pa_space_create(struct pa_space *ps, QEMU_Elf *qemu_elf)
.paddr = phdr[i].p_paddr,
.size = phdr[i].p_filesz,
};
block_i++;
pa_block_align(&ps->block[block_i]);
block_i = ps->block[block_i].size ? (block_i + 1) : block_i;
}
}
ps->block_nr = block_i;
return 0;
}

1
contrib/elf2dmp/addrspace.h
View file

@ -12,6 +12,7 @@
#define ELF2DMP_PAGE_BITS 12
#define ELF2DMP_PAGE_SIZE (1ULL << ELF2DMP_PAGE_BITS)
#define ELF2DMP_PAGE_MASK (ELF2DMP_PAGE_SIZE - 1)
#define ELF2DMP_PFN_MASK (~(ELF2DMP_PAGE_SIZE - 1))
#define INVALID_PA UINT64_MAX

5
contrib/elf2dmp/main.c
View file

@ -400,9 +400,10 @@ static int write_dump(struct pa_space *ps,
for (i = 0; i < ps->block_nr; i++) {
struct pa_block *b = &ps->block[i];
printf("Writing block #%zu/%zu to file...\n", i, ps->block_nr);
printf("Writing block #%zu/%zu of %"PRIu64" bytes to file...\n", i,
ps->block_nr, b->size);
if (fwrite(b->addr, b->size, 1, dmp_file) != 1) {
eprintf("Failed to write dump header\n");
eprintf("Failed to write block\n");
fclose(dmp_file);
return 1;
}