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Implement R_ARM_THM_MOVT_[ABS|REPL] for thumb (#1615)

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Huang Qi 2022-10-19 06:08:51 +08:00 committed by GitHub
parent 654ac5feca
commit 86d3f30600
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1 changed files with 41 additions and 0 deletions
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41
core/iwasm/aot/arch/aot_reloc_thumb.c
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@ -8,6 +8,10 @@
#define R_ARM_ABS32 2 /* Direct 32 bit */ #define R_ARM_ABS32 2 /* Direct 32 bit */
#define R_ARM_THM_CALL 10 /* PC relative (Thumb BL and ARMv5 Thumb BLX). */ #define R_ARM_THM_CALL 10 /* PC relative (Thumb BL and ARMv5 Thumb BLX). */
#define R_ARM_THM_JMP24 30 /* B.W */ #define R_ARM_THM_JMP24 30 /* B.W */
#define R_ARM_THM_MOVW_ABS_NC 47
#define R_ARM_THM_MOVT_ABS 48
#define R_ARM_THM_MOVW_PREL_NC 49
#define R_ARM_THM_MOVT_PREL 50
/* clang-format off */ /* clang-format off */
void __adddf3(); void __adddf3();
@ -372,6 +376,43 @@ apply_relocation(AOTModule *module, uint8 *target_section_addr,
+ (intptr_t)reloc_addend; + (intptr_t)reloc_addend;
break; break;
} }
case R_ARM_THM_MOVW_ABS_NC:
case R_ARM_THM_MOVT_ABS:
case R_ARM_THM_MOVW_PREL_NC:
case R_ARM_THM_MOVT_PREL:
{
uint16 upper = *(uint16 *)(target_section_addr + reloc_offset);
uint16 lower = *(uint16 *)(target_section_addr + reloc_offset + 2);
int32 offset;
/*
* MOVT/MOVW instructions encoding in Thumb-2:
*
* i = upper[10]
* imm4 = upper[3:0]
* imm3 = lower[14:12]
* imm8 = lower[7:0]
*
* imm16 = imm4:i:imm3:imm8
*/
offset = ((upper & 0x000f) << 12) | ((upper & 0x0400) << 1)
| ((lower & 0x7000) >> 4) | (lower & 0x00ff);
offset = (offset ^ 0x8000) - 0x8000;
offset += (symbol_addr + reloc_addend);
if (reloc_type == R_ARM_THM_MOVT_PREL
|| reloc_type == R_ARM_THM_MOVW_PREL_NC)
offset -= (int32)(target_section_addr + reloc_offset);
if (reloc_type == R_ARM_THM_MOVT_ABS
|| reloc_type == R_ARM_THM_MOVT_PREL)
offset >>= 16;
*(uint16 *)(target_section_addr + reloc_offset) = upper;
*(uint16 *)(target_section_addr + reloc_offset + 2) = lower;
break;
}
default: default:
if (error_buf != NULL) if (error_buf != NULL)