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[Qemu-devel] [PATCH v2] target-mips: fix broken MIPS16 and microMIPS
|
From: |
Yongbok Kim |
|
Subject: |
[Qemu-devel] [PATCH v2] target-mips: fix broken MIPS16 and microMIPS |
|
Date: |
Tue, 1 Jul 2014 17:43:05 +0100 |
Commit 240ce26a broke MIPS16 and microMIPS support as it didn't
care those branches and jumps don't have delay slot in
MIPS16 and microMIPS.
This patch introduces a new argument delayslot_size to the
gen_compute_branch() indicating size of delay slot {0, 2, 4}.
And the information is used to call handle_delay_slot() forcingly
when no delay slot is required.
There are some microMIPS branch and jump instructions that requires
exact size of instruction in the delay slot. For indicating
these instructions, MIPS_HFLAG_BDS_STRICT flag is introduced.
Those fictional branch opcodes defined to support MIPS16 and
microMIPS are no longer needed.
Signed-off-by: Yongbok Kim <address@hidden>
---
v2:
* correct MIPS_HFLAG_TMASK
---
target-mips/cpu.h | 13 +-
target-mips/translate.c | 284 ++++++++++++++++++-----------------------------
2 files changed, 117 insertions(+), 180 deletions(-)
diff --git a/target-mips/cpu.h b/target-mips/cpu.h
index 8b9a92e..c81dfac 100644
--- a/target-mips/cpu.h
+++ b/target-mips/cpu.h
@@ -431,7 +431,7 @@ struct CPUMIPSState {
int error_code;
uint32_t hflags; /* CPU State */
/* TMASK defines different execution modes */
-#define MIPS_HFLAG_TMASK 0xC07FF
+#define MIPS_HFLAG_TMASK 0x1807FF
#define MIPS_HFLAG_MODE 0x00007 /* execution modes */
/* The KSU flags must be the lowest bits in hflags. The flag order
must be the same as defined for CP0 Status. This allows to use
@@ -463,17 +463,18 @@ struct CPUMIPSState {
#define MIPS_HFLAG_BL 0x01800 /* Likely branch */
#define MIPS_HFLAG_BR 0x02000 /* branch to register (can't link TB) */
/* Extra flags about the current pending branch. */
-#define MIPS_HFLAG_BMASK_EXT 0x3C000
+#define MIPS_HFLAG_BMASK_EXT 0x7C000
#define MIPS_HFLAG_B16 0x04000 /* branch instruction was 16 bits */
#define MIPS_HFLAG_BDS16 0x08000 /* branch requires 16-bit delay slot */
#define MIPS_HFLAG_BDS32 0x10000 /* branch requires 32-bit delay slot */
-#define MIPS_HFLAG_BX 0x20000 /* branch exchanges execution mode */
+#define MIPS_HFLAG_BDS_STRICT 0x20000 /* Strict delay slot size */
+#define MIPS_HFLAG_BX 0x40000 /* branch exchanges execution mode */
#define MIPS_HFLAG_BMASK (MIPS_HFLAG_BMASK_BASE | MIPS_HFLAG_BMASK_EXT)
/* MIPS DSP resources access. */
-#define MIPS_HFLAG_DSP 0x40000 /* Enable access to MIPS DSP resources. */
-#define MIPS_HFLAG_DSPR2 0x80000 /* Enable access to MIPS DSPR2 resources. */
+#define MIPS_HFLAG_DSP 0x080000 /* Enable access to MIPS DSP resources. */
+#define MIPS_HFLAG_DSPR2 0x100000 /* Enable access to MIPS DSPR2 resources. */
/* Extra flag about HWREna register. */
-#define MIPS_HFLAG_HWRENA_ULR 0x100000 /* ULR bit from HWREna is set. */
+#define MIPS_HFLAG_HWRENA_ULR 0x200000 /* ULR bit from HWREna is set. */
target_ulong btarget; /* Jump / branch target */
target_ulong bcond; /* Branch condition (if needed) */
diff --git a/target-mips/translate.c b/target-mips/translate.c
index 2f91959..a654ae8 100644
--- a/target-mips/translate.c
+++ b/target-mips/translate.c
@@ -61,7 +61,6 @@ enum {
/* Jump and branches */
OPC_J = (0x02 << 26),
OPC_JAL = (0x03 << 26),
- OPC_JALS = OPC_JAL | 0x5,
OPC_BEQ = (0x04 << 26), /* Unconditional if rs = rt = 0 (B) */
OPC_BEQL = (0x14 << 26),
OPC_BNE = (0x05 << 26),
@@ -70,8 +69,7 @@ enum {
OPC_BLEZL = (0x16 << 26),
OPC_BGTZ = (0x07 << 26),
OPC_BGTZL = (0x17 << 26),
- OPC_JALX = (0x1D << 26), /* MIPS 16 only */
- OPC_JALXS = OPC_JALX | 0x5,
+ OPC_JALX = (0x1D << 26),
/* Load and stores */
OPC_LDL = (0x1A << 26),
OPC_LDR = (0x1B << 26),
@@ -171,8 +169,6 @@ enum {
/* Jumps */
OPC_JR = 0x08 | OPC_SPECIAL, /* Also JR.HB */
OPC_JALR = 0x09 | OPC_SPECIAL, /* Also JALR.HB */
- OPC_JALRC = OPC_JALR | (0x5 << 6),
- OPC_JALRS = 0x10 | OPC_SPECIAL | (0x5 << 6),
/* Traps */
OPC_TGE = 0x30 | OPC_SPECIAL,
OPC_TGEU = 0x31 | OPC_SPECIAL,
@@ -236,10 +232,8 @@ enum {
OPC_BGEZ = (0x01 << 16) | OPC_REGIMM,
OPC_BGEZL = (0x03 << 16) | OPC_REGIMM,
OPC_BLTZAL = (0x10 << 16) | OPC_REGIMM,
- OPC_BLTZALS = OPC_BLTZAL | 0x5, /* microMIPS */
OPC_BLTZALL = (0x12 << 16) | OPC_REGIMM,
OPC_BGEZAL = (0x11 << 16) | OPC_REGIMM,
- OPC_BGEZALS = OPC_BGEZAL | 0x5, /* microMIPS */
OPC_BGEZALL = (0x13 << 16) | OPC_REGIMM,
OPC_TGEI = (0x08 << 16) | OPC_REGIMM,
OPC_TGEIU = (0x09 << 16) | OPC_REGIMM,
@@ -3597,7 +3591,8 @@ static inline void gen_goto_tb(DisasContext *ctx, int n,
target_ulong dest)
/* Branches (before delay slot) */
static void gen_compute_branch (DisasContext *ctx, uint32_t opc,
int insn_bytes,
- int rs, int rt, int32_t offset)
+ int rs, int rt, int32_t offset,
+ int delayslot_size)
{
target_ulong btgt = -1;
int blink = 0;
@@ -3629,7 +3624,6 @@ static void gen_compute_branch (DisasContext *ctx,
uint32_t opc,
break;
case OPC_BGEZ:
case OPC_BGEZAL:
- case OPC_BGEZALS:
case OPC_BGEZALL:
case OPC_BGEZL:
case OPC_BGTZ:
@@ -3638,7 +3632,6 @@ static void gen_compute_branch (DisasContext *ctx,
uint32_t opc,
case OPC_BLEZL:
case OPC_BLTZ:
case OPC_BLTZAL:
- case OPC_BLTZALS:
case OPC_BLTZALL:
case OPC_BLTZL:
/* Compare to zero */
@@ -3661,15 +3654,11 @@ static void gen_compute_branch (DisasContext *ctx,
uint32_t opc,
case OPC_J:
case OPC_JAL:
case OPC_JALX:
- case OPC_JALS:
- case OPC_JALXS:
/* Jump to immediate */
btgt = ((ctx->pc + insn_bytes) & (int32_t)0xF0000000) |
(uint32_t)offset;
break;
case OPC_JR:
case OPC_JALR:
- case OPC_JALRC:
- case OPC_JALRS:
/* Jump to register */
if (offset != 0 && offset != 16) {
/* Hint = 0 is JR/JALR, hint 16 is JR.HB/JALR.HB, the
@@ -3698,12 +3687,8 @@ static void gen_compute_branch (DisasContext *ctx,
uint32_t opc,
ctx->hflags |= MIPS_HFLAG_B;
MIPS_DEBUG("balways");
break;
- case OPC_BGEZALS:
case OPC_BGEZAL: /* 0 >= 0 */
case OPC_BGEZALL: /* 0 >= 0 likely */
- ctx->hflags |= (opc == OPC_BGEZALS
- ? MIPS_HFLAG_BDS16
- : MIPS_HFLAG_BDS32);
/* Always take and link */
blink = 31;
ctx->hflags |= MIPS_HFLAG_B;
@@ -3715,15 +3700,11 @@ static void gen_compute_branch (DisasContext *ctx,
uint32_t opc,
/* Treat as NOP. */
MIPS_DEBUG("bnever (NOP)");
goto out;
- case OPC_BLTZALS:
case OPC_BLTZAL: /* 0 < 0 */
- ctx->hflags |= (opc == OPC_BLTZALS
- ? MIPS_HFLAG_BDS16
- : MIPS_HFLAG_BDS32);
/* Handle as an unconditional branch to get correct delay
slot checking. */
blink = 31;
- btgt = ctx->pc + (opc == OPC_BLTZALS ? 6 : 8);
+ btgt = ctx->pc + insn_bytes + delayslot_size;
ctx->hflags |= MIPS_HFLAG_B;
MIPS_DEBUG("bnever and link");
break;
@@ -3744,33 +3725,21 @@ static void gen_compute_branch (DisasContext *ctx,
uint32_t opc,
ctx->hflags |= MIPS_HFLAG_B;
MIPS_DEBUG("j " TARGET_FMT_lx, btgt);
break;
- case OPC_JALXS:
case OPC_JALX:
ctx->hflags |= MIPS_HFLAG_BX;
/* Fallthrough */
- case OPC_JALS:
case OPC_JAL:
blink = 31;
ctx->hflags |= MIPS_HFLAG_B;
- ctx->hflags |= ((opc == OPC_JALS || opc == OPC_JALXS)
- ? MIPS_HFLAG_BDS16
- : MIPS_HFLAG_BDS32);
MIPS_DEBUG("jal " TARGET_FMT_lx, btgt);
break;
case OPC_JR:
ctx->hflags |= MIPS_HFLAG_BR;
- if (insn_bytes == 4)
- ctx->hflags |= MIPS_HFLAG_BDS32;
MIPS_DEBUG("jr %s", regnames[rs]);
break;
- case OPC_JALRS:
case OPC_JALR:
- case OPC_JALRC:
blink = rt;
ctx->hflags |= MIPS_HFLAG_BR;
- ctx->hflags |= (opc == OPC_JALRS
- ? MIPS_HFLAG_BDS16
- : MIPS_HFLAG_BDS32);
MIPS_DEBUG("jalr %s, %s", regnames[rt], regnames[rs]);
break;
default:
@@ -3808,11 +3777,7 @@ static void gen_compute_branch (DisasContext *ctx,
uint32_t opc,
tcg_gen_setcondi_tl(TCG_COND_GE, bcond, t0, 0);
MIPS_DEBUG("bgezl %s, " TARGET_FMT_lx, regnames[rs], btgt);
goto likely;
- case OPC_BGEZALS:
case OPC_BGEZAL:
- ctx->hflags |= (opc == OPC_BGEZALS
- ? MIPS_HFLAG_BDS16
- : MIPS_HFLAG_BDS32);
tcg_gen_setcondi_tl(TCG_COND_GE, bcond, t0, 0);
MIPS_DEBUG("bgezal %s, " TARGET_FMT_lx, regnames[rs], btgt);
blink = 31;
@@ -3856,11 +3821,7 @@ static void gen_compute_branch (DisasContext *ctx,
uint32_t opc,
MIPS_DEBUG("bposge64 " TARGET_FMT_lx, btgt);
goto not_likely;
#endif
- case OPC_BLTZALS:
case OPC_BLTZAL:
- ctx->hflags |= (opc == OPC_BLTZALS
- ? MIPS_HFLAG_BDS16
- : MIPS_HFLAG_BDS32);
tcg_gen_setcondi_tl(TCG_COND_LT, bcond, t0, 0);
blink = 31;
MIPS_DEBUG("bltzal %s, " TARGET_FMT_lx, regnames[rs], btgt);
@@ -3884,13 +3845,21 @@ static void gen_compute_branch (DisasContext *ctx,
uint32_t opc,
blink, ctx->hflags, btgt);
ctx->btarget = btgt;
+
+ switch (delayslot_size) {
+ case 2:
+ ctx->hflags |= MIPS_HFLAG_BDS16;
+ break;
+ case 4:
+ ctx->hflags |= MIPS_HFLAG_BDS32;
+ break;
+ }
+
if (blink > 0) {
int post_delay = insn_bytes;
int lowbit = !!(ctx->hflags & MIPS_HFLAG_M16);
- if (opc != OPC_JALRC)
- post_delay += ((ctx->hflags & MIPS_HFLAG_BDS16) ? 2 : 4);
-
+ post_delay += delayslot_size;
tcg_gen_movi_tl(cpu_gpr[blink], ctx->pc + post_delay + lowbit);
}
@@ -7124,7 +7093,7 @@ static void gen_compute_branch1(DisasContext *ctx,
uint32_t op,
MIPS_DEBUG("%s: cond %02x target " TARGET_FMT_lx, opn,
ctx->hflags, btarget);
ctx->btarget = btarget;
-
+ ctx->hflags |= MIPS_HFLAG_BDS32;
out:
tcg_temp_free_i32(t0);
}
@@ -9667,15 +9636,15 @@ static int decode_extended_mips16_opc (CPUMIPSState
*env, DisasContext *ctx)
gen_addiupc(ctx, rx, imm, 0, 1);
break;
case M16_OPC_B:
- gen_compute_branch(ctx, OPC_BEQ, 4, 0, 0, offset << 1);
+ gen_compute_branch(ctx, OPC_BEQ, 4, 0, 0, offset << 1, 0);
/* No delay slot, so just process as a normal instruction */
break;
case M16_OPC_BEQZ:
- gen_compute_branch(ctx, OPC_BEQ, 4, rx, 0, offset << 1);
+ gen_compute_branch(ctx, OPC_BEQ, 4, rx, 0, offset << 1, 0);
/* No delay slot, so just process as a normal instruction */
break;
case M16_OPC_BNEQZ:
- gen_compute_branch(ctx, OPC_BNE, 4, rx, 0, offset << 1);
+ gen_compute_branch(ctx, OPC_BNE, 4, rx, 0, offset << 1, 0);
/* No delay slot, so just process as a normal instruction */
break;
case M16_OPC_SHIFT:
@@ -9733,10 +9702,10 @@ static int decode_extended_mips16_opc (CPUMIPSState
*env, DisasContext *ctx)
case M16_OPC_I8:
switch (funct) {
case I8_BTEQZ:
- gen_compute_branch(ctx, OPC_BEQ, 4, 24, 0, offset << 1);
+ gen_compute_branch(ctx, OPC_BEQ, 4, 24, 0, offset << 1, 0);
break;
case I8_BTNEZ:
- gen_compute_branch(ctx, OPC_BNE, 4, 24, 0, offset << 1);
+ gen_compute_branch(ctx, OPC_BNE, 4, 24, 0, offset << 1, 0);
break;
case I8_SWRASP:
gen_st(ctx, OPC_SW, 31, 29, imm);
@@ -9864,7 +9833,7 @@ static int decode_mips16_opc (CPUMIPSState *env,
DisasContext *ctx)
case M16_OPC_B:
offset = (ctx->opcode & 0x7ff) << 1;
offset = (int16_t)(offset << 4) >> 4;
- gen_compute_branch(ctx, OPC_BEQ, 2, 0, 0, offset);
+ gen_compute_branch(ctx, OPC_BEQ, 2, 0, 0, offset, 0);
/* No delay slot, so just process as a normal instruction */
break;
case M16_OPC_JAL:
@@ -9872,16 +9841,18 @@ static int decode_mips16_opc (CPUMIPSState *env,
DisasContext *ctx)
offset = (((ctx->opcode & 0x1f) << 21)
| ((ctx->opcode >> 5) & 0x1f) << 16
| offset) << 2;
- op = ((ctx->opcode >> 10) & 0x1) ? OPC_JALXS : OPC_JALS;
- gen_compute_branch(ctx, op, 4, rx, ry, offset);
+ op = ((ctx->opcode >> 10) & 0x1) ? OPC_JALX : OPC_JAL;
+ gen_compute_branch(ctx, op, 4, rx, ry, offset, 2);
n_bytes = 4;
break;
case M16_OPC_BEQZ:
- gen_compute_branch(ctx, OPC_BEQ, 2, rx, 0, ((int8_t)ctx->opcode) << 1);
+ gen_compute_branch(ctx, OPC_BEQ, 2, rx, 0,
+ ((int8_t)ctx->opcode) << 1, 0);
/* No delay slot, so just process as a normal instruction */
break;
case M16_OPC_BNEQZ:
- gen_compute_branch(ctx, OPC_BNE, 2, rx, 0, ((int8_t)ctx->opcode) << 1);
+ gen_compute_branch(ctx, OPC_BNE, 2, rx, 0,
+ ((int8_t)ctx->opcode) << 1, 0);
/* No delay slot, so just process as a normal instruction */
break;
case M16_OPC_SHIFT:
@@ -9954,11 +9925,11 @@ static int decode_mips16_opc (CPUMIPSState *env,
DisasContext *ctx)
switch (funct) {
case I8_BTEQZ:
gen_compute_branch(ctx, OPC_BEQ, 2, 24, 0,
- ((int8_t)ctx->opcode) << 1);
+ ((int8_t)ctx->opcode) << 1, 0);
break;
case I8_BTNEZ:
gen_compute_branch(ctx, OPC_BNE, 2, 24, 0,
- ((int8_t)ctx->opcode) << 1);
+ ((int8_t)ctx->opcode) << 1, 0);
break;
case I8_SWRASP:
gen_st(ctx, OPC_SW, 31, 29, (ctx->opcode & 0xff) << 2);
@@ -10107,12 +10078,13 @@ static int decode_mips16_opc (CPUMIPSState *env,
DisasContext *ctx)
int ra = (ctx->opcode >> 5) & 0x1;
if (link) {
- op = nd ? OPC_JALRC : OPC_JALRS;
+ op = OPC_JALR;
} else {
op = OPC_JR;
}
- gen_compute_branch(ctx, op, 2, ra ? 31 : rx, 31, 0);
+ gen_compute_branch(ctx, op, 2, ra ? 31 : rx, 31, 0,
+ (nd ? 0 : 2));
}
break;
case RR_SDBBP:
@@ -10870,7 +10842,6 @@ static void gen_pool16c_insn(DisasContext *ctx)
{
int rd = mmreg((ctx->opcode >> 3) & 0x7);
int rs = mmreg(ctx->opcode & 0x7);
- int opc;
switch (((ctx->opcode) >> 4) & 0x3f) {
case NOT16 + 0:
@@ -10926,32 +10897,27 @@ static void gen_pool16c_insn(DisasContext *ctx)
{
int reg = ctx->opcode & 0x1f;
- gen_compute_branch(ctx, OPC_JR, 2, reg, 0, 0);
+ gen_compute_branch(ctx, OPC_JR, 2, reg, 0, 0, 4);
}
break;
case JRC16 + 0:
case JRC16 + 1:
{
int reg = ctx->opcode & 0x1f;
-
- gen_compute_branch(ctx, OPC_JR, 2, reg, 0, 0);
+ gen_compute_branch(ctx, OPC_JR, 2, reg, 0, 0, 0);
/* Let normal delay slot handling in our caller take us
to the branch target. */
}
break;
case JALR16 + 0:
case JALR16 + 1:
- opc = OPC_JALR;
- goto do_jalr;
+ gen_compute_branch(ctx, OPC_JALR, 2, ctx->opcode & 0x1f, 31, 0, 4);
+ ctx->hflags |= MIPS_HFLAG_BDS_STRICT;
+ break;
case JALR16S + 0:
case JALR16S + 1:
- opc = OPC_JALRS;
- do_jalr:
- {
- int reg = ctx->opcode & 0x1f;
-
- gen_compute_branch(ctx, opc, 2, reg, 31, 0);
- }
+ gen_compute_branch(ctx, OPC_JALR, 2, ctx->opcode & 0x1f, 31, 0, 2);
+ ctx->hflags |= MIPS_HFLAG_BDS_STRICT;
break;
case MFHI16 + 0:
case MFHI16 + 1:
@@ -10979,8 +10945,7 @@ static void gen_pool16c_insn(DisasContext *ctx)
case JRADDIUSP + 1:
{
int imm = ZIMM(ctx->opcode, 0, 5);
-
- gen_compute_branch(ctx, OPC_JR, 2, 31, 0, 0);
+ gen_compute_branch(ctx, OPC_JR, 2, 31, 0, 0, 0);
gen_arith_imm(ctx, OPC_ADDIU, 29, 29, imm << 2);
/* Let normal delay slot handling in our caller take us
to the branch target. */
@@ -11237,11 +11202,13 @@ static void gen_pool32axf (CPUMIPSState *env,
DisasContext *ctx, int rt, int rs)
switch (minor) {
case JALR:
case JALR_HB:
- gen_compute_branch (ctx, OPC_JALR, 4, rs, rt, 0);
+ gen_compute_branch(ctx, OPC_JALR, 4, rs, rt, 0, 4);
+ ctx->hflags |= MIPS_HFLAG_BDS_STRICT;
break;
case JALRS:
case JALRS_HB:
- gen_compute_branch (ctx, OPC_JALRS, 4, rs, rt, 0);
+ gen_compute_branch(ctx, OPC_JALR, 4, rs, rt, 0, 2);
+ ctx->hflags |= MIPS_HFLAG_BDS_STRICT;
break;
default:
goto pool32axf_invalid;
@@ -12131,30 +12098,32 @@ static void decode_micromips32_opc (CPUMIPSState
*env, DisasContext *ctx,
minor = (ctx->opcode >> 21) & 0x1f;
switch (minor) {
case BLTZ:
- mips32_op = OPC_BLTZ;
- goto do_branch;
+ gen_compute_branch(ctx, OPC_BLTZ, 4, rs, -1, imm << 1, 4);
+ break;
case BLTZAL:
- mips32_op = OPC_BLTZAL;
- goto do_branch;
+ gen_compute_branch(ctx, OPC_BLTZAL, 4, rs, -1, imm << 1, 4);
+ ctx->hflags |= MIPS_HFLAG_BDS_STRICT;
+ break;
case BLTZALS:
- mips32_op = OPC_BLTZALS;
- goto do_branch;
+ gen_compute_branch(ctx, OPC_BLTZAL, 4, rs, -1, imm << 1, 2);
+ ctx->hflags |= MIPS_HFLAG_BDS_STRICT;
+ break;
case BGEZ:
- mips32_op = OPC_BGEZ;
- goto do_branch;
+ gen_compute_branch(ctx, OPC_BGEZ, 4, rs, -1, imm << 1, 4);
+ break;
case BGEZAL:
- mips32_op = OPC_BGEZAL;
- goto do_branch;
+ gen_compute_branch(ctx, OPC_BGEZAL, 4, rs, -1, imm << 1, 4);
+ ctx->hflags |= MIPS_HFLAG_BDS_STRICT;
+ break;
case BGEZALS:
- mips32_op = OPC_BGEZALS;
- goto do_branch;
+ gen_compute_branch(ctx, OPC_BGEZAL, 4, rs, -1, imm << 1, 2);
+ ctx->hflags |= MIPS_HFLAG_BDS_STRICT;
+ break;
case BLEZ:
- mips32_op = OPC_BLEZ;
- goto do_branch;
+ gen_compute_branch(ctx, OPC_BLEZ, 4, rs, -1, imm << 1, 4);
+ break;
case BGTZ:
- mips32_op = OPC_BGTZ;
- do_branch:
- gen_compute_branch(ctx, mips32_op, 4, rs, -1, imm << 1);
+ gen_compute_branch(ctx, OPC_BGTZ, 4, rs, -1, imm << 1, 4);
break;
/* Traps */
@@ -12182,7 +12151,7 @@ static void decode_micromips32_opc (CPUMIPSState *env,
DisasContext *ctx,
case BNEZC:
case BEQZC:
gen_compute_branch(ctx, minor == BNEZC ? OPC_BNE : OPC_BEQ,
- 4, rs, 0, imm << 1);
+ 4, rs, 0, imm << 1, 0);
/* Compact branches don't have a delay slot, so just let
the normal delay slot handling take us to the branch
target. */
@@ -12320,25 +12289,28 @@ static void decode_micromips32_opc (CPUMIPSState
*env, DisasContext *ctx,
break;
case JALX32:
offset = (int32_t)(ctx->opcode & 0x3FFFFFF) << 2;
- gen_compute_branch(ctx, OPC_JALX, 4, rt, rs, offset);
+ gen_compute_branch(ctx, OPC_JALX, 4, rt, rs, offset, 4);
+ ctx->hflags |= MIPS_HFLAG_BDS_STRICT;
break;
case JALS32:
offset = (int32_t)(ctx->opcode & 0x3FFFFFF) << 1;
- gen_compute_branch(ctx, OPC_JALS, 4, rt, rs, offset);
+ gen_compute_branch(ctx, OPC_JAL, 4, rt, rs, offset, 2);
+ ctx->hflags |= MIPS_HFLAG_BDS_STRICT;
break;
case BEQ32:
- gen_compute_branch(ctx, OPC_BEQ, 4, rt, rs, imm << 1);
+ gen_compute_branch(ctx, OPC_BEQ, 4, rt, rs, imm << 1, 4);
break;
case BNE32:
- gen_compute_branch(ctx, OPC_BNE, 4, rt, rs, imm << 1);
+ gen_compute_branch(ctx, OPC_BNE, 4, rt, rs, imm << 1, 4);
break;
case J32:
gen_compute_branch(ctx, OPC_J, 4, rt, rs,
- (int32_t)(ctx->opcode & 0x3FFFFFF) << 1);
+ (int32_t)(ctx->opcode & 0x3FFFFFF) << 1, 4);
break;
case JAL32:
gen_compute_branch(ctx, OPC_JAL, 4, rt, rs,
- (int32_t)(ctx->opcode & 0x3FFFFFF) << 1);
+ (int32_t)(ctx->opcode & 0x3FFFFFF) << 1, 4);
+ ctx->hflags |= MIPS_HFLAG_BDS_STRICT;
break;
/* Floating point (COP1) */
case LWC132:
@@ -12422,84 +12394,41 @@ static int decode_micromips_opc (CPUMIPSState *env,
DisasContext *ctx)
op = (ctx->opcode >> 10) & 0x3f;
/* Enforce properly-sized instructions in a delay slot */
- if (ctx->hflags & MIPS_HFLAG_BMASK) {
- int bits = ctx->hflags & MIPS_HFLAG_BMASK_EXT;
-
- switch (op) {
- case POOL32A:
- case POOL32B:
- case POOL32I:
- case POOL32C:
- case ADDI32:
- case ADDIU32:
- case ORI32:
- case XORI32:
- case SLTI32:
- case SLTIU32:
- case ANDI32:
- case JALX32:
- case LBU32:
- case LHU32:
- case POOL32F:
- case JALS32:
- case BEQ32:
- case BNE32:
- case J32:
- case JAL32:
- case SB32:
- case SH32:
- case POOL32S:
- case ADDIUPC:
- case SWC132:
- case SDC132:
- case SD32:
- case SW32:
- case LB32:
- case LH32:
- case DADDIU32:
- case LWC132:
- case LDC132:
- case LD32:
- case LW32:
- if (bits & MIPS_HFLAG_BDS16) {
+ if (ctx->hflags & MIPS_HFLAG_BDS_STRICT) {
+ switch (op & 0x7) { /* MSB-3..MSB-5 */
+ case 0:
+ /* POOL31A, POOL32B, POOL32I, POOL32C */
+ case 4:
+ /* ADDI32, ADDIU32, ORI32, XORI32, SLTI32, SLTIU32, ANDI32, JALX32 */
+ case 5:
+ /* LBU32, LHU32, POOL32F, JALS32, BEQ32, BNE32, J32, JAL32 */
+ case 6:
+ /* SB32, SH32, ADDIUPC, SWC132, SDC132, SW32 */
+ case 7:
+ /* LB32, LH32, LWC132, LDC132, LW32 */
+ if (ctx->hflags & MIPS_HFLAG_BDS16) {
generate_exception(ctx, EXCP_RI);
/* Just stop translation; the user is confused. */
ctx->bstate = BS_STOP;
return 2;
}
break;
- case POOL16A:
- case POOL16B:
- case POOL16C:
- case LWGP16:
- case POOL16F:
- case LBU16:
- case LHU16:
- case LWSP16:
- case LW16:
- case SB16:
- case SH16:
- case SWSP16:
- case SW16:
- case MOVE16:
- case ANDI16:
- case POOL16D:
- case POOL16E:
- case BEQZ16:
- case BNEZ16:
- case B16:
- case LI16:
- if (bits & MIPS_HFLAG_BDS32) {
+ case 1:
+ /* POOL16A, POOL16B, POOL16C, LWGP16, POOL16F */
+ case 2:
+ /* LBU16, LHU16, LWSP16, LW16, SB16, SH16, SWSP16, SW16 */
+ case 3:
+ /* MOVE16, ANDI16, POOL16D, POOL16E, BEQZ16, BNEZ16, B16, LI16 */
+ if (ctx->hflags & MIPS_HFLAG_BDS32) {
generate_exception(ctx, EXCP_RI);
/* Just stop translation; the user is confused. */
ctx->bstate = BS_STOP;
return 2;
}
break;
- default:
- break;
}
}
+
switch (op) {
case POOL16A:
{
@@ -12680,13 +12609,13 @@ static int decode_micromips_opc (CPUMIPSState *env,
DisasContext *ctx)
break;
case B16:
gen_compute_branch(ctx, OPC_BEQ, 2, 0, 0,
- SIMM(ctx->opcode, 0, 10) << 1);
+ SIMM(ctx->opcode, 0, 10) << 1, 4);
break;
case BNEZ16:
case BEQZ16:
gen_compute_branch(ctx, op == BNEZ16 ? OPC_BNE : OPC_BEQ, 2,
mmreg(uMIPS_RD(ctx->opcode)),
- 0, SIMM(ctx->opcode, 0, 7) << 1);
+ 0, SIMM(ctx->opcode, 0, 7) << 1, 4);
break;
case LI16:
{
@@ -14556,7 +14485,7 @@ static void decode_opc (CPUMIPSState *env, DisasContext
*ctx)
gen_muldiv(ctx, op1, 0, rs, rt);
break;
case OPC_JR ... OPC_JALR:
- gen_compute_branch(ctx, op1, 4, rs, rd, sa);
+ gen_compute_branch(ctx, op1, 4, rs, rd, sa, 4);
break;
case OPC_TGE ... OPC_TEQ: /* Traps */
case OPC_TNE:
@@ -15322,7 +15251,7 @@ static void decode_opc (CPUMIPSState *env, DisasContext
*ctx)
switch (op1) {
case OPC_BLTZ ... OPC_BGEZL: /* REGIMM branches */
case OPC_BLTZAL ... OPC_BGEZALL:
- gen_compute_branch(ctx, op1, 4, rs, -1, imm << 2);
+ gen_compute_branch(ctx, op1, 4, rs, -1, imm << 2, 4);
break;
case OPC_TGEI ... OPC_TEQI: /* REGIMM traps */
case OPC_TNEI:
@@ -15337,7 +15266,7 @@ static void decode_opc (CPUMIPSState *env, DisasContext
*ctx)
case OPC_BPOSGE64:
#endif
check_dsp(ctx);
- gen_compute_branch(ctx, op1, 4, -1, -2, (int32_t)imm << 2);
+ gen_compute_branch(ctx, op1, 4, -1, -2, (int32_t)imm << 2, 4);
break;
default: /* Invalid */
MIPS_INVAL("regimm");
@@ -15448,11 +15377,11 @@ static void decode_opc (CPUMIPSState *env,
DisasContext *ctx)
break;
case OPC_J ... OPC_JAL: /* Jump */
offset = (int32_t)(ctx->opcode & 0x3FFFFFF) << 2;
- gen_compute_branch(ctx, op, 4, rs, rt, offset);
+ gen_compute_branch(ctx, op, 4, rs, rt, offset, 4);
break;
case OPC_BEQ ... OPC_BGTZ: /* Branch */
case OPC_BEQL ... OPC_BGTZL:
- gen_compute_branch(ctx, op, 4, rs, rt, imm << 2);
+ gen_compute_branch(ctx, op, 4, rs, rt, imm << 2, 4);
break;
case OPC_LB ... OPC_LWR: /* Load and stores */
case OPC_LL:
@@ -15617,7 +15546,7 @@ static void decode_opc (CPUMIPSState *env, DisasContext
*ctx)
case OPC_JALX:
check_insn(ctx, ASE_MIPS16 | ASE_MICROMIPS);
offset = (int32_t)(ctx->opcode & 0x3FFFFFF) << 2;
- gen_compute_branch(ctx, op, 4, rs, rt, offset);
+ gen_compute_branch(ctx, op, 4, rs, rt, offset, 4);
break;
case OPC_MDMX:
check_insn(ctx, ASE_MDMX);
@@ -15719,6 +15648,13 @@ gen_intermediate_code_internal(MIPSCPU *cpu,
TranslationBlock *tb,
ctx.bstate = BS_STOP;
break;
}
+ if (ctx.hflags & MIPS_HFLAG_BMASK) {
+ if (!(ctx.hflags & MIPS_HFLAG_BDS16) &&
+ !(ctx.hflags & MIPS_HFLAG_BDS32)) {
+ is_delay = 1;
+ /* force to generate branch as no delay slot is required */
+ }
+ }
if (is_delay) {
handle_delay_slot(&ctx, insn_bytes);
}
--
1.7.4
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- [Qemu-devel] [PATCH v2] target-mips: fix broken MIPS16 and microMIPS,
Yongbok Kim <=