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tcg/loongarch64: Implement necessary relocation operations

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Signed-off-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20211221054105.178795-8-git@xen0n.name>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
WANG Xuerui 2021-12-21 13:40:41 +08:00 committed by Richard Henderson
parent ba0cdd8040
commit bf8c1c8140
1 changed files with 66 additions and 0 deletions
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66
tcg/loongarch64/tcg-target.c.inc
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@ -168,3 +168,69 @@ static bool tcg_target_const_match(int64_t val, TCGType type, int ct)
}
return false;
}
/*
* Relocations
*/
/*
* Relocation records defined in LoongArch ELF psABI v1.00 is way too
* complicated; a whopping stack machine is needed to stuff the fields, at
* the very least one SOP_PUSH and one SOP_POP (of the correct format) are
* needed.
*
* Hence, define our own simpler relocation types. Numbers are chosen as to
* not collide with potential future additions to the true ELF relocation
* type enum.
*/
/* Field Sk16, shifted right by 2; suitable for conditional jumps */
#define R_LOONGARCH_BR_SK16 256
/* Field Sd10k16, shifted right by 2; suitable for B and BL */
#define R_LOONGARCH_BR_SD10K16 257
static bool reloc_br_sk16(tcg_insn_unit *src_rw, const tcg_insn_unit *target)
{
const tcg_insn_unit *src_rx = tcg_splitwx_to_rx(src_rw);
intptr_t offset = (intptr_t)target - (intptr_t)src_rx;
tcg_debug_assert((offset & 3) == 0);
offset >>= 2;
if (offset == sextreg(offset, 0, 16)) {
*src_rw = deposit64(*src_rw, 10, 16, offset);
return true;
}
return false;
}
static bool reloc_br_sd10k16(tcg_insn_unit *src_rw,
const tcg_insn_unit *target)
{
const tcg_insn_unit *src_rx = tcg_splitwx_to_rx(src_rw);
intptr_t offset = (intptr_t)target - (intptr_t)src_rx;
tcg_debug_assert((offset & 3) == 0);
offset >>= 2;
if (offset == sextreg(offset, 0, 26)) {
*src_rw = deposit64(*src_rw, 0, 10, offset >> 16); /* slot d10 */
*src_rw = deposit64(*src_rw, 10, 16, offset); /* slot k16 */
return true;
}
return false;
}
static bool patch_reloc(tcg_insn_unit *code_ptr, int type,
intptr_t value, intptr_t addend)
{
tcg_debug_assert(addend == 0);
switch (type) {
case R_LOONGARCH_BR_SK16:
return reloc_br_sk16(code_ptr, (tcg_insn_unit *)value);
case R_LOONGARCH_BR_SD10K16:
return reloc_br_sd10k16(code_ptr, (tcg_insn_unit *)value);
default:
g_assert_not_reached();
}
}