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Add new cases in ARC relocation of AOT #4653

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695dbf0
add new case for arc relocation
Septa2112 Sep 26, 2025
49c826c
add comments
Septa2112 Sep 30, 2025
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78 changes: 76 additions & 2 deletions core/iwasm/aot/arch/aot_reloc_arc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -310,6 +310,80 @@ apply_relocation(AOTModule *module, uint8 *target_section_addr,
int32 symbol_index, char *error_buf, uint32 error_buf_size)
{
switch (reloc_type) {
case R_ARC_S21H_PCREL:
{
uint32 insn = LOAD_I32(target_section_addr + reloc_offset);
int32 addend, value;
uintptr_t S, P;
intptr_t A;

CHECK_RELOC_OFFSET(sizeof(void *));

/* Convert from middle endian */
insn = middle_endian_convert(insn);

/* Extract the first 10 bits from Position 6 to 15 in insn */
addend = (insn << 16) >> 22;
addend = addend << 10;
/* Extract the remaining 10 bits from Position 17 to 26 in insn */
addend |= ((insn << 5) >> 22);
/* Fill in 1 bits to get the 21 bit Offset Value */
addend = addend << 1;

/* (S + A) - P */
S = (uintptr_t)(uint8 *)symbol_addr;
A = (intptr_t)reloc_addend;
P = (uintptr_t)(target_section_addr + reloc_offset);
P &= (uintptr_t)~1;
value = (int32)(S + A + addend - P);

insn = insn & 0xf801003f;
insn |= ((((value >> 1) & 0x3ff) << 17)
| (((value >> 1) & 0xffc00) >> 4));

/* Convert to middle endian */
insn = middle_endian_convert(insn);

STORE_U32(target_section_addr + reloc_offset, insn);
break;
}
case R_ARC_S21W_PCREL:
{
uint32 insn = LOAD_I32(target_section_addr + reloc_offset);
int32 addend, value;
uintptr_t S, P;
intptr_t A;

CHECK_RELOC_OFFSET(sizeof(void *));

/* Convert from middle endian */
insn = middle_endian_convert(insn);

/* Extract the first 10 bits from Position 6 to 15 in insn */
addend = (insn << 16) >> 22;
addend = addend << 9;
/* Extract the remaining 9 bits from Position 18 to 26 in insn */
addend |= ((insn << 5) >> 23);
/* Fill in 2 bits to get the 21 bit Offset Value */
addend = addend << 2;

/* (S + A) - P */
S = (uintptr_t)(uint8 *)symbol_addr;
A = (intptr_t)reloc_addend;
P = (uintptr_t)(target_section_addr + reloc_offset);
P &= (uintptr_t)~3;
value = (int32)(S + A + addend - P);

insn = insn & 0xf803003f;
insn |= ((((value >> 2) & 0x1ff) << 18)
| (((value >> 2) & 0x7fe00) >> 3));

/* Convert to middle endian */
insn = middle_endian_convert(insn);

STORE_U32(target_section_addr + reloc_offset, insn);
break;
}
case R_ARC_S25H_PCREL:
{
uint32 insn = LOAD_I32(target_section_addr + reloc_offset);
Expand Down Expand Up @@ -340,8 +414,8 @@ apply_relocation(AOTModule *module, uint8 *target_section_addr,

insn = insn & 0xf8010030;
insn |= ((((value >> 1) & 0x3ff) << 17)
| (((value >> 1) & 0xffc00) >> 3)
| (((value >> 1) & 0xf00000) >> 19));
| (((value >> 1) & 0xffc00) >> 4)
| (((value >> 1) & 0xf00000) >> 20));

/* Convert to middle endian */
insn = middle_endian_convert(insn);
Expand Down
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