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runtimer_loader/arm: implement relocations

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Change-Id: Ibda978e37d6dbdaf33ac054adbbda70768fe0d97
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4975
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: waddlesplash <[email protected]>
This commit is contained in:
David Karoly
2022-02-23 22:41:26 +00:00
committed by waddlesplash
parent f98f9bccb8
commit 24b174f4f9
1 changed files with 81 additions and 4 deletions
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src/system/runtime_loader/arch/arm/arch_relocate.cpp
+81 -4
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@@ -1,5 +1,5 @@
/*
* Copyright 2012, Haiku, Inc.
* Copyright 2012-2022, Haiku, Inc.
* Distributed under the terms of the MIT License.
*
* Authors:
@@ -16,15 +16,92 @@
//#define TRACE_RLD
#ifdef TRACE_RLD
# define TRACE(x) dprintf x
# define TRACE(x...) dprintf(x)
#else
# define TRACE(x) ;
# define TRACE(x...) ;
#endif
static int
relocate_rel(image_t *rootImage, image_t *image, Elf32_Rel *rel, int rel_len,
SymbolLookupCache* cache)
{
# define P ((addr_t *)(image->regions[0].delta + rel[i].r_offset))
# define A (*(P))
# define B (image->regions[0].delta)
for (int i = 0; i * (int)sizeof(Elf32_Rel) < rel_len; i++) {
unsigned type = ELF32_R_TYPE(rel[i].r_info);
unsigned symbolIndex = ELF32_R_SYM(rel[i].r_info);
addr_t final_val;
addr_t S;
image_t* symbolImage = NULL;
if (symbolIndex != 0) {
Elf32_Sym* sym = SYMBOL(image, symbolIndex);
status_t status = resolve_symbol(rootImage, image, sym, cache, &S,
&symbolImage);
if (status < B_OK) {
TRACE("resolve symbol \"%s\" returned: %ld\n",
SYMNAME(image, sym), status);
return status;
}
}
switch (type) {
case R_ARM_NONE:
continue;
case R_ARM_RELATIVE:
final_val = B + A;
break;
case R_ARM_JMP_SLOT:
case R_ARM_GLOB_DAT:
final_val = S;
break;
case R_ARM_ABS32:
final_val = S + A;
break;
default:
TRACE("unhandled relocation type %d\n", ELF32_R_TYPE(rel[i].r_info));
return B_NOT_ALLOWED;
}
*P = final_val;
}
# undef P
# undef A
# undef B
return B_NO_ERROR;
}
status_t
arch_relocate_image(image_t *rootImage, image_t *image,
SymbolLookupCache* cache)
{
debugger("arch_relocate_image: Not Yet Implemented!");
status_t status;
// deal with the rels first
if (image->rel) {
status = relocate_rel(rootImage, image, image->rel, image->rel_len,
cache);
if (status < B_OK)
return status;
}
if (image->pltrel) {
status = relocate_rel(rootImage, image, image->pltrel,
image->pltrel_len, cache);
if (status < B_OK)
return status;
}
if (image->rela) {
TRACE("RELA relocations not supported\n");
return EOPNOTSUPP;
}
return B_OK;
}