From bf8c1c8140c748a3fcddf2b5367457a34cc82fa9 Mon Sep 17 00:00:00 2001 From: WANG Xuerui Date: Tue, 21 Dec 2021 13:40:41 +0800 Subject: tcg/loongarch64: Implement necessary relocation operations MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: WANG Xuerui Reviewed-by: Richard Henderson Reviewed-by: Philippe Mathieu-Daudé Message-Id: <20211221054105.178795-8-git@xen0n.name> Signed-off-by: Richard Henderson --- tcg/loongarch64/tcg-target.c.inc | 66 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) (limited to 'tcg/loongarch64') diff --git a/tcg/loongarch64/tcg-target.c.inc b/tcg/loongarch64/tcg-target.c.inc index 1c1b798..a88ba9a 100644 --- a/tcg/loongarch64/tcg-target.c.inc +++ b/tcg/loongarch64/tcg-target.c.inc @@ -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(); + } +} -- cgit v1.1