target/mips: Call cpu_is_bigendian & inline GET_OFFSET in ld/st helpers

The target endianess information is stored in the BigEndian
bit of the Config0 register in CP0.

As a first step, inline the GET_OFFSET() macro, calling
cpu_is_bigendian() to get the 'direction' of the offset.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210818215517.2560994-2-f4bug@amsat.org>

1 files changed, 33 insertions, 22 deletions

diff --git a/target/mips/tcg/ldst_helper.c b/target/mips/tcg/ldst_helper.c
index d42812b8a6..8d1dfea676 100644
--- a/target/mips/tcg/ldst_helper.c
+++ b/target/mips/tcg/ldst_helper.c
@@ -52,31 +52,36 @@ HELPER_LD_ATOMIC(lld, ldq, 0x7, (target_ulong))
 
 #endif /* !CONFIG_USER_ONLY */
 
+static inline bool cpu_is_bigendian(CPUMIPSState *env)
+{
+    return extract32(env->CP0_Config0, CP0C0_BE, 1);
+}
+
 #ifdef TARGET_WORDS_BIGENDIAN
 #define GET_LMASK(v) ((v) & 3)
-#define GET_OFFSET(addr, offset) (addr + (offset))
 #else
 #define GET_LMASK(v) (((v) & 3) ^ 3)
-#define GET_OFFSET(addr, offset) (addr - (offset))
 #endif
 
 void helper_swl(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
                 int mem_idx)
 {
+    int dir = cpu_is_bigendian(env) ? 1 : -1;
+
     cpu_stb_mmuidx_ra(env, arg2, (uint8_t)(arg1 >> 24), mem_idx, GETPC());
 
     if (GET_LMASK(arg2) <= 2) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 1), (uint8_t)(arg1 >> 16),
+        cpu_stb_mmuidx_ra(env, arg2 + 1 * dir, (uint8_t)(arg1 >> 16),
                           mem_idx, GETPC());
     }
 
     if (GET_LMASK(arg2) <= 1) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 2), (uint8_t)(arg1 >> 8),
+        cpu_stb_mmuidx_ra(env, arg2 + 2 * dir, (uint8_t)(arg1 >> 8),
                           mem_idx, GETPC());
     }
 
     if (GET_LMASK(arg2) == 0) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 3), (uint8_t)arg1,
+        cpu_stb_mmuidx_ra(env, arg2 + 3 * dir, (uint8_t)arg1,
                           mem_idx, GETPC());
     }
 }
@@ -84,20 +89,22 @@ void helper_swl(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
 void helper_swr(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
                 int mem_idx)
 {
+    int dir = cpu_is_bigendian(env) ? 1 : -1;
+
     cpu_stb_mmuidx_ra(env, arg2, (uint8_t)arg1, mem_idx, GETPC());
 
     if (GET_LMASK(arg2) >= 1) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -1), (uint8_t)(arg1 >> 8),
+        cpu_stb_mmuidx_ra(env, arg2 - 1 * dir, (uint8_t)(arg1 >> 8),
                           mem_idx, GETPC());
     }
 
     if (GET_LMASK(arg2) >= 2) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -2), (uint8_t)(arg1 >> 16),
+        cpu_stb_mmuidx_ra(env, arg2 - 2 * dir, (uint8_t)(arg1 >> 16),
                           mem_idx, GETPC());
     }
 
     if (GET_LMASK(arg2) == 3) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -3), (uint8_t)(arg1 >> 24),
+        cpu_stb_mmuidx_ra(env, arg2 - 3 * dir, (uint8_t)(arg1 >> 24),
                           mem_idx, GETPC());
     }
 }
@@ -116,40 +123,42 @@ void helper_swr(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
 void helper_sdl(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
                 int mem_idx)
 {
+    int dir = cpu_is_bigendian(env) ? 1 : -1;
+
     cpu_stb_mmuidx_ra(env, arg2, (uint8_t)(arg1 >> 56), mem_idx, GETPC());
 
     if (GET_LMASK64(arg2) <= 6) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 1), (uint8_t)(arg1 >> 48),
+        cpu_stb_mmuidx_ra(env, arg2 + 1 * dir, (uint8_t)(arg1 >> 48),
                           mem_idx, GETPC());
     }
 
     if (GET_LMASK64(arg2) <= 5) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 2), (uint8_t)(arg1 >> 40),
+        cpu_stb_mmuidx_ra(env, arg2 + 2 * dir, (uint8_t)(arg1 >> 40),
                           mem_idx, GETPC());
     }
 
     if (GET_LMASK64(arg2) <= 4) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 3), (uint8_t)(arg1 >> 32),
+        cpu_stb_mmuidx_ra(env, arg2 + 3 * dir, (uint8_t)(arg1 >> 32),
                           mem_idx, GETPC());
     }
 
     if (GET_LMASK64(arg2) <= 3) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 4), (uint8_t)(arg1 >> 24),
+        cpu_stb_mmuidx_ra(env, arg2 + 4 * dir, (uint8_t)(arg1 >> 24),
                           mem_idx, GETPC());
     }
 
     if (GET_LMASK64(arg2) <= 2) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 5), (uint8_t)(arg1 >> 16),
+        cpu_stb_mmuidx_ra(env, arg2 + 5 * dir, (uint8_t)(arg1 >> 16),
                           mem_idx, GETPC());
     }
 
     if (GET_LMASK64(arg2) <= 1) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 6), (uint8_t)(arg1 >> 8),
+        cpu_stb_mmuidx_ra(env, arg2 + 6 * dir, (uint8_t)(arg1 >> 8),
                           mem_idx, GETPC());
     }
 
     if (GET_LMASK64(arg2) <= 0) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, 7), (uint8_t)arg1,
+        cpu_stb_mmuidx_ra(env, arg2 + 7 * dir, (uint8_t)arg1,
                           mem_idx, GETPC());
     }
 }
@@ -157,40 +166,42 @@ void helper_sdl(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
 void helper_sdr(CPUMIPSState *env, target_ulong arg1, target_ulong arg2,
                 int mem_idx)
 {
+    int dir = cpu_is_bigendian(env) ? 1 : -1;
+
     cpu_stb_mmuidx_ra(env, arg2, (uint8_t)arg1, mem_idx, GETPC());
 
     if (GET_LMASK64(arg2) >= 1) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -1), (uint8_t)(arg1 >> 8),
+        cpu_stb_mmuidx_ra(env, arg2 - 1 * dir, (uint8_t)(arg1 >> 8),
                           mem_idx, GETPC());
     }
 
     if (GET_LMASK64(arg2) >= 2) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -2), (uint8_t)(arg1 >> 16),
+        cpu_stb_mmuidx_ra(env, arg2 - 2 * dir, (uint8_t)(arg1 >> 16),
                           mem_idx, GETPC());
     }
 
     if (GET_LMASK64(arg2) >= 3) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -3), (uint8_t)(arg1 >> 24),
+        cpu_stb_mmuidx_ra(env, arg2 - 3 * dir, (uint8_t)(arg1 >> 24),
                           mem_idx, GETPC());
     }
 
     if (GET_LMASK64(arg2) >= 4) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -4), (uint8_t)(arg1 >> 32),
+        cpu_stb_mmuidx_ra(env, arg2 - 4 * dir, (uint8_t)(arg1 >> 32),
                           mem_idx, GETPC());
     }
 
     if (GET_LMASK64(arg2) >= 5) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -5), (uint8_t)(arg1 >> 40),
+        cpu_stb_mmuidx_ra(env, arg2 - 5 * dir, (uint8_t)(arg1 >> 40),
                           mem_idx, GETPC());
     }
 
     if (GET_LMASK64(arg2) >= 6) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -6), (uint8_t)(arg1 >> 48),
+        cpu_stb_mmuidx_ra(env, arg2 - 6 * dir, (uint8_t)(arg1 >> 48),
                           mem_idx, GETPC());
     }
 
     if (GET_LMASK64(arg2) == 7) {
-        cpu_stb_mmuidx_ra(env, GET_OFFSET(arg2, -7), (uint8_t)(arg1 >> 56),
+        cpu_stb_mmuidx_ra(env, arg2 - 7 * dir, (uint8_t)(arg1 >> 56),
                           mem_idx, GETPC());
     }
 }