target/mips: Merge do_translate_address into cpu_mips_translate_address

Currently cpu_mips_translate_address() calls raise_mmu_exception(),
and do_translate_address() calls cpu_loop_exit_restore().

This API split is dangerous, we could call cpu_mips_translate_address
without returning to the main loop.

As there is only one caller, it is trivial (and safer) to merge
do_translate_address() back to cpu_mips_translate_address().

Reported-by: Richard Henderson <richard.henderson@linaro.org>
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210428170410.479308-10-f4bug@amsat.org>

diff --git a/target/mips/internal.h b/target/mips/internal.h
index 04f4b3d66144b19d43e80ee3adcf2f67ad132e1b..e93e057bece7fefc2b344794703aa77b1017f07e 100644 (file)
--- a/target/mips/internal.h
+++ b/target/mips/internal.h
@@ -148,7 +148,7 @@ void mips_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
                                     int mmu_idx, MemTxAttrs attrs,
                                     MemTxResult response, uintptr_t retaddr);
 hwaddr cpu_mips_translate_address(CPUMIPSState *env, target_ulong address,
-                                  MMUAccessType access_type);
+                                  MMUAccessType access_type, uintptr_t retaddr);
 #endif
 
 #define cpu_signal_handler cpu_mips_signal_handler

diff --git a/target/mips/op_helper.c b/target/mips/op_helper.c
index 222a0d7c7b3f50f425f44756f9a5fb74b59cbf4b..61e68cc8bedee12896bf890db15a3578cb978d13 100644 (file)
--- a/target/mips/op_helper.c
+++ b/target/mips/op_helper.c
@@ -287,23 +287,6 @@ target_ulong helper_rotx(target_ulong rs, uint32_t shift, uint32_t shiftx,
 
 #ifndef CONFIG_USER_ONLY
 
-static inline hwaddr do_translate_address(CPUMIPSState *env,
-                                          target_ulong address,
-                                          MMUAccessType access_type,
-                                          uintptr_t retaddr)
-{
-    hwaddr paddr;
-    CPUState *cs = env_cpu(env);
-
-    paddr = cpu_mips_translate_address(env, address, access_type);
-
-    if (paddr == -1LL) {
-        cpu_loop_exit_restore(cs, retaddr);
-    } else {
-        return paddr;
-    }
-}
-
 #define HELPER_LD_ATOMIC(name, insn, almask, do_cast)                         \
 target_ulong helper_##name(CPUMIPSState *env, target_ulong arg, int mem_idx)  \
 {                                                                             \
@@ -313,7 +296,8 @@ target_ulong helper_##name(CPUMIPSState *env, target_ulong arg, int mem_idx)  \
         }                                                                     \
         do_raise_exception(env, EXCP_AdEL, GETPC());                          \
     }                                                                         \
-    env->CP0_LLAddr = do_translate_address(env, arg, MMU_DATA_LOAD, GETPC()); \
+    env->CP0_LLAddr = cpu_mips_translate_address(env, arg, MMU_DATA_LOAD,     \
+                                                 GETPC());                    \
     env->lladdr = arg;                                                        \
     env->llval = do_cast cpu_##insn##_mmuidx_ra(env, arg, mem_idx, GETPC());  \
     return env->llval;                                                        \

diff --git a/target/mips/tlb_helper.c b/target/mips/tlb_helper.c
index 8d3ea497803232bc1cd6be448621d04cc002ad93..1ffdc1f8304c0c025ac858c42185141cee7bd2aa 100644 (file)
--- a/target/mips/tlb_helper.c
+++ b/target/mips/tlb_helper.c
@@ -904,21 +904,22 @@ bool mips_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
 
 #ifndef CONFIG_USER_ONLY
 hwaddr cpu_mips_translate_address(CPUMIPSState *env, target_ulong address,
-                                  MMUAccessType access_type)
+                                  MMUAccessType access_type, uintptr_t retaddr)
 {
     hwaddr physical;
     int prot;
     int ret = 0;
+    CPUState *cs = env_cpu(env);
 
     /* data access */
     ret = get_physical_address(env, &physical, &prot, address, access_type,
                                cpu_mmu_index(env, false));
-    if (ret != TLBRET_MATCH) {
-        raise_mmu_exception(env, address, access_type, ret);
-        return -1LL;
-    } else {
+    if (ret == TLBRET_MATCH) {
         return physical;
     }
+
+    raise_mmu_exception(env, address, access_type, ret);
+    cpu_loop_exit_restore(cs, retaddr);
 }
 
 static void set_hflags_for_handler(CPUMIPSState *env)