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arch/x86_64: add basic support for R_X86_64_REX_GOTPCRELX relocation 

GOTPCRELX reloc available only for CONFIG_ARCH_ADDRENV=y

when CONFIG_ARCH_ADDRENV is not set, CONFIG_ARCH_TEXT_VBASE is not specified
so we can't relocate

Signed-off-by: p-szafonimateusz <p-szafonimateusz@xiaomi.com>
This commit is contained in:
p-szafonimateusz 2024-08-20 13:18:57 +02:00 committed by Xiang Xiao
parent 3a677e3268
commit 92cbb63fc8
2 changed files with 35 additions and 7 deletions
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15
arch/x86_64/include/elf.h
View File

@ -25,13 +25,14 @@
* Pre-processor Prototypes
****************************************************************************/
#define R_X86_64_NONE 0
#define R_X86_64_64 1
#define R_X86_64_PC32 2
#define R_X86_64_PLT32 4
#define R_X86_64_32 10
#define R_X86_64_32S 11
#define R_X86_64_PC64 24
#define R_X86_64_NONE 0
#define R_X86_64_64 1
#define R_X86_64_PC32 2
#define R_X86_64_PLT32 4
#define R_X86_64_32 10
#define R_X86_64_32S 11
#define R_X86_64_PC64 24
#define R_X86_64_REX_GOTPCRELX 42
/* 4.3.1 ELF Identification. Should have:
*

27
libs/libc/machine/x86_64/arch_elf64.c
View File

@ -37,6 +37,13 @@
#include <nuttx/elf.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define OPCODE_MOV 0x8b
#define OPCODE_LEA 0x8d
/****************************************************************************
* Public Functions
****************************************************************************/
@ -174,6 +181,26 @@ int up_relocateadd(const Elf64_Rela *rel, const Elf64_Sym *sym,
*(uint32_t *)addr = value;
break;
#ifdef CONFIG_ARCH_ADDRENV
case R_X86_64_REX_GOTPCRELX:
/* Handle like R_X86_64_PC32 but with load offset */
value = (sym->st_value + rel->r_addend - addr +
CONFIG_ARCH_TEXT_VBASE);
/* Convert MOV to LEA - other relocations not suported */
if (*(uint8_t *)(addr - 2) != OPCODE_MOV)
{
berr("ERROR: not supported REX_GOTPCRELX relocation\n");
return -EINVAL;
}
*(uint8_t *)(addr - 2) = OPCODE_LEA;
*(uint32_t *)(addr) = value;
break;
#endif
default:
berr("ERROR: Unsupported relocation: %d\n", relotype);
return -EINVAL;