target/mips: Add simple user-mode mips_cpu_tlb_fill()

tlb_helper.c's #ifdef'ry hides a quite simple user-mode
implementation of mips_cpu_tlb_fill().

Copy the user-mode implementation (without #ifdef'ry) to
tcg/user/helper.c and simplify tlb_helper.c's #ifdef'ry.

This will allow us to restrict tlb_helper.c to sysemu.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210428170410.479308-15-f4bug@amsat.org>

2 files changed, 36 insertions, 10 deletions

diff --git a/target/mips/tcg/user/tlb_helper.c b/target/mips/tcg/user/tlb_helper.c
index 453b9e9b93..b835144b82 100644
--- a/target/mips/tcg/user/tlb_helper.c
+++ b/target/mips/tcg/user/tlb_helper.c
@@ -22,6 +22,42 @@
 #include "exec/exec-all.h"
 #include "internal.h"
 
+static void raise_mmu_exception(CPUMIPSState *env, target_ulong address,
+                                MMUAccessType access_type)
+{
+    CPUState *cs = env_cpu(env);
+
+    env->error_code = 0;
+    if (access_type == MMU_INST_FETCH) {
+        env->error_code |= EXCP_INST_NOTAVAIL;
+    }
+
+    /* Reference to kernel address from user mode or supervisor mode */
+    /* Reference to supervisor address from user mode */
+    if (access_type == MMU_DATA_STORE) {
+        cs->exception_index = EXCP_AdES;
+    } else {
+        cs->exception_index = EXCP_AdEL;
+    }
+
+    /* Raise exception */
+    if (!(env->hflags & MIPS_HFLAG_DM)) {
+        env->CP0_BadVAddr = address;
+    }
+}
+
+bool mips_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
+                       MMUAccessType access_type, int mmu_idx,
+                       bool probe, uintptr_t retaddr)
+{
+    MIPSCPU *cpu = MIPS_CPU(cs);
+    CPUMIPSState *env = &cpu->env;
+
+    /* data access */
+    raise_mmu_exception(env, address, access_type);
+    do_raise_exception_err(env, cs->exception_index, env->error_code, retaddr);
+}
+
 void mips_cpu_do_interrupt(CPUState *cs)
 {
     cs->exception_index = EXCP_NONE;
diff --git a/target/mips/tlb_helper.c b/target/mips/tlb_helper.c
index 78720c4d20..afc019c80d 100644
--- a/target/mips/tlb_helper.c
+++ b/target/mips/tlb_helper.c
@@ -403,8 +403,6 @@ void cpu_mips_tlb_flush(CPUMIPSState *env)
     env->tlb->tlb_in_use = env->tlb->nb_tlb;
 }
 
-#endif /* !CONFIG_USER_ONLY */
-
 static void raise_mmu_exception(CPUMIPSState *env, target_ulong address,
                                 MMUAccessType access_type, int tlb_error)
 {
@@ -484,8 +482,6 @@ static void raise_mmu_exception(CPUMIPSState *env, target_ulong address,
     env->error_code = error_code;
 }
 
-#if !defined(CONFIG_USER_ONLY)
-
 hwaddr mips_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
 {
     MIPSCPU *cpu = MIPS_CPU(cs);
@@ -833,7 +829,6 @@ refill:
     return true;
 }
 #endif
-#endif /* !CONFIG_USER_ONLY */
 
 bool mips_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
                        MMUAccessType access_type, int mmu_idx,
@@ -841,14 +836,11 @@ bool mips_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
 {
     MIPSCPU *cpu = MIPS_CPU(cs);
     CPUMIPSState *env = &cpu->env;
-#if !defined(CONFIG_USER_ONLY)
     hwaddr physical;
     int prot;
-#endif
     int ret = TLBRET_BADADDR;
 
     /* data access */
-#if !defined(CONFIG_USER_ONLY)
     /* XXX: put correct access by using cpu_restore_state() correctly */
     ret = get_physical_address(env, &physical, &prot, address,
                                access_type, mmu_idx);
@@ -896,13 +888,11 @@ bool mips_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
     if (probe) {
         return false;
     }
-#endif
 
     raise_mmu_exception(env, address, access_type, ret);
     do_raise_exception_err(env, cs->exception_index, env->error_code, retaddr);
 }
 
-#ifndef CONFIG_USER_ONLY
 hwaddr cpu_mips_translate_address(CPUMIPSState *env, target_ulong address,
                                   MMUAccessType access_type, uintptr_t retaddr)
 {