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Diffstat (limited to 'target-mips')
-rw-r--r--target-mips/cpu.h6
-rw-r--r--target-mips/helper.c45
-rw-r--r--target-mips/op_helper.c17
-rw-r--r--target-mips/translate.c76
4 files changed, 133 insertions, 11 deletions
diff --git a/target-mips/cpu.h b/target-mips/cpu.h
index 9c38b4ff74..4687f4f2cf 100644
--- a/target-mips/cpu.h
+++ b/target-mips/cpu.h
@@ -283,6 +283,8 @@ struct CPUMIPSState {
#define CP0SRSC4_SRS13 0
int32_t CP0_HWREna;
target_ulong CP0_BadVAddr;
+ uint32_t CP0_BadInstr;
+ uint32_t CP0_BadInstrP;
int32_t CP0_Count;
target_ulong CP0_EntryHi;
#define CP0EnHi_EHINV 10
@@ -383,6 +385,8 @@ struct CPUMIPSState {
#define CP0C2_SA 0
int32_t CP0_Config3;
#define CP0C3_M 31
+#define CP0C3_BP 27
+#define CP0C3_BI 26
#define CP0C3_ISA_ON_EXC 16
#define CP0C3_ULRI 13
#define CP0C3_RXI 12
@@ -453,6 +457,8 @@ struct CPUMIPSState {
CPUMIPSFPUContext fpus[MIPS_FPU_MAX];
/* QEMU */
int error_code;
+#define EXCP_TLB_NOMATCH 0x1
+#define EXCP_INST_NOTAVAIL 0x2 /* No valid instruction word for BadInstr */
uint32_t hflags; /* CPU State */
/* TMASK defines different execution modes */
#define MIPS_HFLAG_TMASK 0x1807FF
diff --git a/target-mips/helper.c b/target-mips/helper.c
index 05325d92e9..c92b25c2a0 100644
--- a/target-mips/helper.c
+++ b/target-mips/helper.c
@@ -25,6 +25,7 @@
#include "cpu.h"
#include "sysemu/kvm.h"
+#include "exec/cpu_ldst.h"
enum {
TLBRET_XI = -6,
@@ -241,6 +242,10 @@ static void raise_mmu_exception(CPUMIPSState *env, target_ulong address,
CPUState *cs = CPU(mips_env_get_cpu(env));
int exception = 0, error_code = 0;
+ if (rw == MMU_INST_FETCH) {
+ error_code |= EXCP_INST_NOTAVAIL;
+ }
+
switch (tlb_error) {
default:
case TLBRET_BADADDR:
@@ -259,7 +264,7 @@ static void raise_mmu_exception(CPUMIPSState *env, target_ulong address,
} else {
exception = EXCP_TLBL;
}
- error_code = 1;
+ error_code |= EXCP_TLB_NOMATCH;
break;
case TLBRET_INVALID:
/* TLB match with no valid bit */
@@ -451,6 +456,21 @@ static void set_hflags_for_handler (CPUMIPSState *env)
<< MIPS_HFLAG_M16_SHIFT);
}
}
+
+static inline void set_badinstr_registers(CPUMIPSState *env)
+{
+ if (env->hflags & MIPS_HFLAG_M16) {
+ /* TODO: add BadInstr support for microMIPS */
+ return;
+ }
+ if (env->CP0_Config3 & (1 << CP0C3_BI)) {
+ env->CP0_BadInstr = cpu_ldl_code(env, env->active_tc.PC);
+ }
+ if ((env->CP0_Config3 & (1 << CP0C3_BP)) &&
+ (env->hflags & MIPS_HFLAG_BMASK)) {
+ env->CP0_BadInstrP = cpu_ldl_code(env, env->active_tc.PC - 4);
+ }
+}
#endif
void mips_cpu_do_interrupt(CPUState *cs)
@@ -458,6 +478,7 @@ void mips_cpu_do_interrupt(CPUState *cs)
#if !defined(CONFIG_USER_ONLY)
MIPSCPU *cpu = MIPS_CPU(cs);
CPUMIPSState *env = &cpu->env;
+ bool update_badinstr = 0;
target_ulong offset;
int cause = -1;
const char *name;
@@ -566,10 +587,13 @@ void mips_cpu_do_interrupt(CPUState *cs)
goto set_EPC;
case EXCP_LTLBL:
cause = 1;
+ update_badinstr = !(env->error_code & EXCP_INST_NOTAVAIL);
goto set_EPC;
case EXCP_TLBL:
cause = 2;
- if (env->error_code == 1 && !(env->CP0_Status & (1 << CP0St_EXL))) {
+ update_badinstr = !(env->error_code & EXCP_INST_NOTAVAIL);
+ if ((env->error_code & EXCP_TLB_NOMATCH) &&
+ !(env->CP0_Status & (1 << CP0St_EXL))) {
#if defined(TARGET_MIPS64)
int R = env->CP0_BadVAddr >> 62;
int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
@@ -586,7 +610,9 @@ void mips_cpu_do_interrupt(CPUState *cs)
goto set_EPC;
case EXCP_TLBS:
cause = 3;
- if (env->error_code == 1 && !(env->CP0_Status & (1 << CP0St_EXL))) {
+ update_badinstr = 1;
+ if ((env->error_code & EXCP_TLB_NOMATCH) &&
+ !(env->CP0_Status & (1 << CP0St_EXL))) {
#if defined(TARGET_MIPS64)
int R = env->CP0_BadVAddr >> 62;
int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
@@ -603,9 +629,11 @@ void mips_cpu_do_interrupt(CPUState *cs)
goto set_EPC;
case EXCP_AdEL:
cause = 4;
+ update_badinstr = !(env->error_code & EXCP_INST_NOTAVAIL);
goto set_EPC;
case EXCP_AdES:
cause = 5;
+ update_badinstr = 1;
goto set_EPC;
case EXCP_IBE:
cause = 6;
@@ -615,32 +643,40 @@ void mips_cpu_do_interrupt(CPUState *cs)
goto set_EPC;
case EXCP_SYSCALL:
cause = 8;
+ update_badinstr = 1;
goto set_EPC;
case EXCP_BREAK:
cause = 9;
+ update_badinstr = 1;
goto set_EPC;
case EXCP_RI:
cause = 10;
+ update_badinstr = 1;
goto set_EPC;
case EXCP_CpU:
cause = 11;
+ update_badinstr = 1;
env->CP0_Cause = (env->CP0_Cause & ~(0x3 << CP0Ca_CE)) |
(env->error_code << CP0Ca_CE);
goto set_EPC;
case EXCP_OVERFLOW:
cause = 12;
+ update_badinstr = 1;
goto set_EPC;
case EXCP_TRAP:
cause = 13;
+ update_badinstr = 1;
goto set_EPC;
case EXCP_FPE:
cause = 15;
+ update_badinstr = 1;
goto set_EPC;
case EXCP_C2E:
cause = 18;
goto set_EPC;
case EXCP_TLBRI:
cause = 19;
+ update_badinstr = 1;
goto set_EPC;
case EXCP_TLBXI:
cause = 20;
@@ -671,6 +707,9 @@ void mips_cpu_do_interrupt(CPUState *cs)
set_EPC:
if (!(env->CP0_Status & (1 << CP0St_EXL))) {
env->CP0_EPC = exception_resume_pc(env);
+ if (update_badinstr) {
+ set_badinstr_registers(env);
+ }
if (env->hflags & MIPS_HFLAG_BMASK) {
env->CP0_Cause |= (1U << CP0Ca_BD);
} else {
diff --git a/target-mips/op_helper.c b/target-mips/op_helper.c
index c33f0eb91a..875aa2c587 100644
--- a/target-mips/op_helper.c
+++ b/target-mips/op_helper.c
@@ -2238,13 +2238,26 @@ void helper_wait(CPUMIPSState *env)
#if !defined(CONFIG_USER_ONLY)
void mips_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
- int is_write, int is_user, uintptr_t retaddr)
+ int access_type, int is_user,
+ uintptr_t retaddr)
{
MIPSCPU *cpu = MIPS_CPU(cs);
CPUMIPSState *env = &cpu->env;
+ int error_code = 0;
+ int excp;
env->CP0_BadVAddr = addr;
- do_raise_exception(env, (is_write == 1) ? EXCP_AdES : EXCP_AdEL, retaddr);
+
+ if (access_type == MMU_DATA_STORE) {
+ excp = EXCP_AdES;
+ } else {
+ excp = EXCP_AdEL;
+ if (access_type == MMU_INST_FETCH) {
+ error_code |= EXCP_INST_NOTAVAIL;
+ }
+ }
+
+ do_raise_exception_err(env, excp, error_code, retaddr);
}
void tlb_fill(CPUState *cs, target_ulong addr, int is_write, int mmu_idx,
diff --git a/target-mips/translate.c b/target-mips/translate.c
index fdb61be8d3..3e6e99026a 100644
--- a/target-mips/translate.c
+++ b/target-mips/translate.c
@@ -1175,6 +1175,8 @@ typedef struct DisasContext {
int kscrexist;
bool rxi;
int ie;
+ bool bi;
+ bool bp;
} DisasContext;
enum {
@@ -4828,9 +4830,25 @@ static void gen_mfc0(DisasContext *ctx, TCGv arg, int reg, int sel)
tcg_gen_ext32s_tl(arg, arg);
rn = "BadVAddr";
break;
+ case 1:
+ if (ctx->bi) {
+ gen_mfc0_load32(arg, offsetof(CPUMIPSState, CP0_BadInstr));
+ rn = "BadInstr";
+ } else {
+ gen_mfc0_unimplemented(ctx, arg);
+ }
+ break;
+ case 2:
+ if (ctx->bp) {
+ gen_mfc0_load32(arg, offsetof(CPUMIPSState, CP0_BadInstrP));
+ rn = "BadInstrP";
+ } else {
+ gen_mfc0_unimplemented(ctx, arg);
+ }
+ break;
default:
goto die;
- }
+ }
break;
case 9:
switch (sel) {
@@ -5428,8 +5446,22 @@ static void gen_mtc0(DisasContext *ctx, TCGv arg, int reg, int sel)
}
break;
case 8:
- /* ignored */
- rn = "BadVAddr";
+ switch (sel) {
+ case 0:
+ /* ignored */
+ rn = "BadVAddr";
+ break;
+ case 1:
+ /* ignored */
+ rn = "BadInstr";
+ break;
+ case 2:
+ /* ignored */
+ rn = "BadInstrP";
+ break;
+ default:
+ goto die;
+ }
break;
case 9:
switch (sel) {
@@ -6054,6 +6086,22 @@ static void gen_dmfc0(DisasContext *ctx, TCGv arg, int reg, int sel)
tcg_gen_ld_tl(arg, cpu_env, offsetof(CPUMIPSState, CP0_BadVAddr));
rn = "BadVAddr";
break;
+ case 1:
+ if (ctx->bi) {
+ gen_mfc0_load32(arg, offsetof(CPUMIPSState, CP0_BadInstr));
+ rn = "BadInstr";
+ } else {
+ gen_mfc0_unimplemented(ctx, arg);
+ }
+ break;
+ case 2:
+ if (ctx->bp) {
+ gen_mfc0_load32(arg, offsetof(CPUMIPSState, CP0_BadInstrP));
+ rn = "BadInstrP";
+ } else {
+ gen_mfc0_unimplemented(ctx, arg);
+ }
+ break;
default:
goto die;
}
@@ -6639,8 +6687,22 @@ static void gen_dmtc0(DisasContext *ctx, TCGv arg, int reg, int sel)
}
break;
case 8:
- /* ignored */
- rn = "BadVAddr";
+ switch (sel) {
+ case 0:
+ /* ignored */
+ rn = "BadVAddr";
+ break;
+ case 1:
+ /* ignored */
+ rn = "BadInstr";
+ break;
+ case 2:
+ /* ignored */
+ rn = "BadInstrP";
+ break;
+ default:
+ goto die;
+ }
break;
case 9:
switch (sel) {
@@ -16862,7 +16924,7 @@ static void decode_opc (CPUMIPSState *env, DisasContext *ctx)
/* make sure instructions are on a word boundary */
if (ctx->pc & 0x3) {
env->CP0_BadVAddr = ctx->pc;
- generate_exception(ctx, EXCP_AdEL);
+ generate_exception_err(ctx, EXCP_AdEL, EXCP_INST_NOTAVAIL);
return;
}
@@ -17500,6 +17562,8 @@ gen_intermediate_code_internal(MIPSCPU *cpu, TranslationBlock *tb,
ctx.kscrexist = (env->CP0_Config4 >> CP0C4_KScrExist) & 0xff;
ctx.rxi = (env->CP0_Config3 >> CP0C3_RXI) & 1;
ctx.ie = (env->CP0_Config4 >> CP0C4_IE) & 3;
+ ctx.bi = (env->CP0_Config3 >> CP0C3_BI) & 1;
+ ctx.bp = (env->CP0_Config3 >> CP0C3_BP) & 1;
/* Restore delay slot state from the tb context. */
ctx.hflags = (uint32_t)tb->flags; /* FIXME: maybe use 64 bits here? */
ctx.ulri = env->CP0_Config3 & (1 << CP0C3_ULRI);
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-14 07:08:22 +0000