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target/m68k: add chk and chk2

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chk and chk2 compare a value to boundaries, and
trigger a CHK exception if the value is out of bounds.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180104012913.30763-8-laurent@vivier.eu>
This commit is contained in:
Laurent Vivier 2018-01-04 02:29:03 +01:00
parent d2f8fb8e7f
commit 8bf6cbaf39
6 changed files with 150 additions and 1 deletions
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7
linux-user/main.c
View File

@ -2985,6 +2985,13 @@ void cpu_loop(CPUM68KState *env)
info._sifields._sigfault._addr = env->pc;
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case EXCP_CHK:
info.si_signo = TARGET_SIGFPE;
info.si_errno = 0;
info.si_code = TARGET_FPE_INTOVF;
info._sifields._sigfault._addr = env->pc;
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case EXCP_DIV0:
info.si_signo = TARGET_SIGFPE;
info.si_errno = 0;

2
target/m68k/cpu.c
View File

@ -134,6 +134,7 @@ static void m68020_cpu_initfn(Object *obj)
m68k_set_feature(env, M68K_FEATURE_CAS);
m68k_set_feature(env, M68K_FEATURE_BKPT);
m68k_set_feature(env, M68K_FEATURE_RTD);
m68k_set_feature(env, M68K_FEATURE_CHK2);
}
#define m68030_cpu_initfn m68020_cpu_initfn
#define m68040_cpu_initfn m68020_cpu_initfn
@ -156,6 +157,7 @@ static void m68060_cpu_initfn(Object *obj)
m68k_set_feature(env, M68K_FEATURE_CAS);
m68k_set_feature(env, M68K_FEATURE_BKPT);
m68k_set_feature(env, M68K_FEATURE_RTD);
m68k_set_feature(env, M68K_FEATURE_CHK2);
}
static void m5208_cpu_initfn(Object *obj)

1
target/m68k/cpu.h
View File

@ -305,6 +305,7 @@ enum m68k_features {
M68K_FEATURE_CAS,
M68K_FEATURE_BKPT,
M68K_FEATURE_RTD,
M68K_FEATURE_CHK2,
};
static inline int m68k_feature(CPUM68KState *env, int feature)

3
target/m68k/helper.h
View File

@ -94,3 +94,6 @@ DEF_HELPER_FLAGS_4(bfchg_mem, TCG_CALL_NO_WG, i32, env, i32, s32, i32)
DEF_HELPER_FLAGS_4(bfclr_mem, TCG_CALL_NO_WG, i32, env, i32, s32, i32)
DEF_HELPER_FLAGS_4(bfset_mem, TCG_CALL_NO_WG, i32, env, i32, s32, i32)
DEF_HELPER_FLAGS_4(bfffo_mem, TCG_CALL_NO_WG, i64, env, i32, s32, i32)
DEF_HELPER_3(chk, void, env, s32, s32)
DEF_HELPER_4(chk2, void, env, s32, s32, s32)

61
target/m68k/op_helper.c
View File

@ -947,3 +947,64 @@ uint64_t HELPER(bfffo_mem)(CPUM68KState *env, uint32_t addr,
is already zero. */
return n | ffo;
}
void HELPER(chk)(CPUM68KState *env, int32_t val, int32_t ub)
{
/* From the specs:
* X: Not affected, C,V,Z: Undefined,
* N: Set if val < 0; cleared if val > ub, undefined otherwise
* We implement here values found from a real MC68040:
* X,V,Z: Not affected
* N: Set if val < 0; cleared if val >= 0
* C: if 0 <= ub: set if val < 0 or val > ub, cleared otherwise
* if 0 > ub: set if val > ub and val < 0, cleared otherwise
*/
env->cc_n = val;
env->cc_c = 0 <= ub ? val < 0 || val > ub : val > ub && val < 0;
if (val < 0 || val > ub) {
CPUState *cs = CPU(m68k_env_get_cpu(env));
/* Recover PC and CC_OP for the beginning of the insn. */
cpu_restore_state(cs, GETPC());
/* flags have been modified by gen_flush_flags() */
env->cc_op = CC_OP_FLAGS;
/* Adjust PC to end of the insn. */
env->pc += 2;
cs->exception_index = EXCP_CHK;
cpu_loop_exit(cs);
}
}
void HELPER(chk2)(CPUM68KState *env, int32_t val, int32_t lb, int32_t ub)
{
/* From the specs:
* X: Not affected, N,V: Undefined,
* Z: Set if val is equal to lb or ub
* C: Set if val < lb or val > ub, cleared otherwise
* We implement here values found from a real MC68040:
* X,N,V: Not affected
* Z: Set if val is equal to lb or ub
* C: if lb <= ub: set if val < lb or val > ub, cleared otherwise
* if lb > ub: set if val > ub and val < lb, cleared otherwise
*/
env->cc_z = val != lb && val != ub;
env->cc_c = lb <= ub ? val < lb || val > ub : val > ub && val < lb;
if (env->cc_c) {
CPUState *cs = CPU(m68k_env_get_cpu(env));
/* Recover PC and CC_OP for the beginning of the insn. */
cpu_restore_state(cs, GETPC());
/* flags have been modified by gen_flush_flags() */
env->cc_op = CC_OP_FLAGS;
/* Adjust PC to end of the insn. */
env->pc += 4;
cs->exception_index = EXCP_CHK;
cpu_loop_exit(cs);
}
}

77
target/m68k/translate.c
View File

@ -4203,6 +4203,80 @@ DISAS_INSN(ff1)
gen_helper_ff1(reg, reg);
}
DISAS_INSN(chk)
{
TCGv src, reg;
int opsize;
switch ((insn >> 7) & 3) {
case 3:
opsize = OS_WORD;
break;
case 2:
if (m68k_feature(env, M68K_FEATURE_CHK2)) {
opsize = OS_LONG;
break;
}
/* fallthru */
default:
gen_exception(s, s->insn_pc, EXCP_ILLEGAL);
return;
}
SRC_EA(env, src, opsize, 1, NULL);
reg = gen_extend(DREG(insn, 9), opsize, 1);
gen_flush_flags(s);
gen_helper_chk(cpu_env, reg, src);
}
DISAS_INSN(chk2)
{
uint16_t ext;
TCGv addr1, addr2, bound1, bound2, reg;
int opsize;
switch ((insn >> 9) & 3) {
case 0:
opsize = OS_BYTE;
break;
case 1:
opsize = OS_WORD;
break;
case 2:
opsize = OS_LONG;
break;
default:
gen_exception(s, s->insn_pc, EXCP_ILLEGAL);
return;
}
ext = read_im16(env, s);
if ((ext & 0x0800) == 0) {
gen_exception(s, s->insn_pc, EXCP_ILLEGAL);
return;
}
addr1 = gen_lea(env, s, insn, OS_UNSIZED);
addr2 = tcg_temp_new();
tcg_gen_addi_i32(addr2, addr1, opsize_bytes(opsize));
bound1 = gen_load(s, opsize, addr1, 1);
tcg_temp_free(addr1);
bound2 = gen_load(s, opsize, addr2, 1);
tcg_temp_free(addr2);
reg = tcg_temp_new();
if (ext & 0x8000) {
tcg_gen_mov_i32(reg, AREG(ext, 12));
} else {
gen_ext(reg, DREG(ext, 12), opsize, 1);
}
gen_flush_flags(s);
gen_helper_chk2(cpu_env, reg, bound1, bound2);
tcg_temp_free(reg);
}
static TCGv gen_get_sr(DisasContext *s)
{
TCGv ccr;
@ -5306,7 +5380,7 @@ void register_m68k_insns (CPUM68KState *env)
BASE(undef, 0000, 0000);
INSN(arith_im, 0080, fff8, CF_ISA_A);
INSN(arith_im, 0000, ff00, M68000);
INSN(undef, 00c0, ffc0, M68000);
INSN(chk2, 00c0, f9c0, CHK2);
INSN(bitrev, 00c0, fff8, CF_ISA_APLUSC);
BASE(bitop_reg, 0100, f1c0);
BASE(bitop_reg, 0140, f1c0);
@ -5339,6 +5413,7 @@ void register_m68k_insns (CPUM68KState *env)
BASE(move, 1000, f000);
BASE(move, 2000, f000);
BASE(move, 3000, f000);
INSN(chk, 4000, f040, M68000);
INSN(strldsr, 40e7, ffff, CF_ISA_APLUSC);
INSN(negx, 4080, fff8, CF_ISA_A);
INSN(negx, 4000, ff00, M68000);