diff options
| author | Qi Hu <huqi@loongson.cn> | 2022-10-15 17:27:54 +0800 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2022-10-25 22:01:14 +1000 |
| commit | f072a1ae7fb47db75eb3c6b960759c908884f585 (patch) | |
| tree | 7fa17e262853d28740798596b4434362d0db02c8 /tcg/loongarch64/tcg-target.h | |
| parent | 0585105c806d3bf301eebc33115a0790fcfc1d9c (diff) | |
tcg/loongarch64: Add direct jump support
Similar to the ARM64, LoongArch has PC-relative instructions such as
PCADDU18I. These instructions can be used to support direct jump for
LoongArch. Additionally, if instruction "B offset" can cover the target
address(target is within ±128MB range), a single "B offset" plus a nop
will be used by "tb_target_set_jump_target".
Signed-off-by: Qi Hu <huqi@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: WANG Xuerui <git@xen0n.name>
Message-Id: <20221015092754.91971-1-huqi@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'tcg/loongarch64/tcg-target.h')
| -rw-r--r-- | tcg/loongarch64/tcg-target.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/tcg/loongarch64/tcg-target.h b/tcg/loongarch64/tcg-target.h index d58a6162f2..a659c8d6fd 100644 --- a/tcg/loongarch64/tcg-target.h +++ b/tcg/loongarch64/tcg-target.h @@ -42,7 +42,11 @@ #define TCG_TARGET_INSN_UNIT_SIZE 4 #define TCG_TARGET_NB_REGS 32 -#define MAX_CODE_GEN_BUFFER_SIZE SIZE_MAX +/* + * PCADDU18I + JIRL sequence can give 20 + 16 + 2 = 38 bits + * signed offset, which is +/- 128 GiB. + */ +#define MAX_CODE_GEN_BUFFER_SIZE (128 * GiB) typedef enum { TCG_REG_ZERO, @@ -123,7 +127,7 @@ typedef enum { #define TCG_TARGET_HAS_clz_i32 1 #define TCG_TARGET_HAS_ctz_i32 1 #define TCG_TARGET_HAS_ctpop_i32 0 -#define TCG_TARGET_HAS_direct_jump 0 +#define TCG_TARGET_HAS_direct_jump 1 #define TCG_TARGET_HAS_brcond2 0 #define TCG_TARGET_HAS_setcond2 0 #define TCG_TARGET_HAS_qemu_st8_i32 0 @@ -166,7 +170,6 @@ typedef enum { #define TCG_TARGET_HAS_muluh_i64 1 #define TCG_TARGET_HAS_mulsh_i64 1 -/* not defined -- call should be eliminated at compile time */ void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t, uintptr_t); #define TCG_TARGET_DEFAULT_MO (0) |