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target-i386: fix confusion in xcr0 bit position vs. mask

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The xsave and xrstor helpers are accessing the x86_ext_save_areas array
using a bit mask instead of a bit position. Provide two sets of XSTATE_*
definitions and use XSTATE_*_BIT when a bit position is requested.

Backports commit cfc3b074de4b4ccee2540edbf8cfdb026dc19943 from qemu
This commit is contained in:
Paolo Bonzini 2018-02-20 20:59:22 -05:00 committed by Lioncash
parent 26951bf754
commit abb0408274
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
4 changed files with 35 additions and 34 deletions
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8
qemu/target-i386/cpu.c
View file

@ -2418,7 +2418,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
*ecx = MAX(*ecx, esa->offset + esa->size);
}
}
*eax |= ena_mask & (XSTATE_FP | XSTATE_SSE);
*eax |= ena_mask & (XSTATE_FP_MASK | XSTATE_SSE_MASK);
*ebx = *ecx;
} else if (count == 1) {
*eax = env->features[FEAT_XSAVE];
@ -2652,15 +2652,15 @@ static void x86_cpu_reset(CPUState *s)
cpu_watchpoint_remove_all(s, BP_CPU);
cr4 = 0;
xcr0 = XSTATE_FP;
xcr0 = XSTATE_FP_MASK;
#ifdef CONFIG_USER_ONLY
/* Enable all the features for user-mode. */
if (env->features[FEAT_1_EDX] & CPUID_SSE) {
xcr0 |= XSTATE_SSE;
xcr0 |= XSTATE_SSE_MASK;
}
if (env->features[FEAT_7_0_EBX] & CPUID_7_0_EBX_MPX) {
xcr0 |= XSTATE_BNDREGS | XSTATE_BNDCSR;
xcr0 |= XSTATE_BNDREGS_MASK | XSTATE_BNDCSR_MASK;
}
if (env->features[FEAT_1_ECX] & CPUID_EXT_XSAVE) {
cr4 |= CR4_OSFXSR_MASK | CR4_OSXSAVE_MASK;

18
qemu/target-i386/cpu.h
View file

@ -412,15 +412,15 @@
#define XSTATE_Hi16_ZMM_BIT 7
#define XSTATE_PKRU_BIT 9
#define XSTATE_FP (1ULL << 0)
#define XSTATE_SSE (1ULL << 1)
#define XSTATE_YMM (1ULL << 2)
#define XSTATE_BNDREGS (1ULL << 3)
#define XSTATE_BNDCSR (1ULL << 4)
#define XSTATE_OPMASK (1ULL << 5)
#define XSTATE_ZMM_Hi256 (1ULL << 6)
#define XSTATE_Hi16_ZMM (1ULL << 7)
#define XSTATE_PKRU (1ULL << 9)
#define XSTATE_FP_MASK (1ULL << XSTATE_FP_BIT)
#define XSTATE_SSE_MASK (1ULL << XSTATE_SSE_BIT)
#define XSTATE_YMM_MASK (1ULL << XSTATE_YMM_BIT)
#define XSTATE_BNDREGS_MASK (1ULL << XSTATE_BNDREGS_BIT)
#define XSTATE_BNDCSR_MASK (1ULL << XSTATE_BNDCSR_BIT)
#define XSTATE_OPMASK_MASK (1ULL << XSTATE_OPMASK_BIT)
#define XSTATE_ZMM_Hi256_MASK (1ULL << XSTATE_ZMM_Hi256_BIT)
#define XSTATE_Hi16_ZMM_MASK (1ULL << XSTATE_Hi16_ZMM_BIT)
#define XSTATE_PKRU_MASK (1ULL << XSTATE_PKRU_BIT)
/* CPUID feature words */

41
qemu/target-i386/fpu_helper.c
View file

@ -1244,7 +1244,7 @@ static uint64_t get_xinuse(CPUX86State *env)
indicate in use. That said, the state of BNDREGS is important
enough to track in HFLAGS, so we might as well use that here. */
if ((env->hflags & HF_MPX_IU_MASK) == 0) {
inuse &= ~XSTATE_BNDREGS;
inuse &= ~XSTATE_BNDREGS_MASK;
}
return inuse;
}
@ -1268,22 +1268,22 @@ static void do_xsave(CPUX86State *env, target_ulong ptr, uint64_t rfbm,
rfbm &= env->xcr0;
opt &= rfbm;
if (opt & XSTATE_FP) {
if (opt & XSTATE_FP_MASK) {
do_xsave_fpu(env, ptr, ra);
}
if (rfbm & XSTATE_SSE) {
if (rfbm & XSTATE_SSE_MASK) {
/* Note that saving MXCSR is not suppressed by XSAVEOPT. */
do_xsave_mxcsr(env, ptr, ra);
}
if (opt & XSTATE_SSE) {
if (opt & XSTATE_SSE_MASK) {
do_xsave_sse(env, ptr, ra);
}
if (opt & XSTATE_BNDREGS) {
target_ulong off = x86_ext_save_areas[XSTATE_BNDREGS].offset;
if (opt & XSTATE_BNDREGS_MASK) {
target_ulong off = x86_ext_save_areas[XSTATE_BNDREGS_BIT].offset;
do_xsave_bndregs(env, ptr + off, ra);
}
if (opt & XSTATE_BNDCSR) {
target_ulong off = x86_ext_save_areas[XSTATE_BNDCSR].offset;
if (opt & XSTATE_BNDCSR_MASK) {
target_ulong off = x86_ext_save_areas[XSTATE_BNDCSR_BIT].offset;
do_xsave_bndcsr(env, ptr + off, ra);
}
@ -1428,19 +1428,19 @@ void helper_xrstor(CPUX86State *env, target_ulong ptr, uint64_t rfbm)
raise_exception_ra(env, EXCP0D_GPF, ra);
}
if (rfbm & XSTATE_FP) {
if (xstate_bv & XSTATE_FP) {
if (rfbm & XSTATE_FP_MASK) {
if (xstate_bv & XSTATE_FP_MASK) {
do_xrstor_fpu(env, ptr, ra);
} else {
helper_fninit(env);
memset(env->fpregs, 0, sizeof(env->fpregs));
}
}
if (rfbm & XSTATE_SSE) {
if (rfbm & XSTATE_SSE_MASK) {
/* Note that the standard form of XRSTOR loads MXCSR from memory
whether or not the XSTATE_BV bit is set. */
do_xrstor_mxcsr(env, ptr, ra);
if (xstate_bv & XSTATE_SSE) {
if (xstate_bv & XSTATE_SSE_MASK) {
do_xrstor_sse(env, ptr, ra);
} else {
/* ??? When AVX is implemented, we may have to be more
@ -1448,9 +1448,9 @@ void helper_xrstor(CPUX86State *env, target_ulong ptr, uint64_t rfbm)
memset(env->xmm_regs, 0, sizeof(env->xmm_regs));
}
}
if (rfbm & XSTATE_BNDREGS) {
if (xstate_bv & XSTATE_BNDREGS) {
target_ulong off = x86_ext_save_areas[XSTATE_BNDREGS].offset;
if (rfbm & XSTATE_BNDREGS_MASK) {
if (xstate_bv & XSTATE_BNDREGS_MASK) {
target_ulong off = x86_ext_save_areas[XSTATE_BNDREGS_BIT].offset;
do_xrstor_bndregs(env, ptr + off, ra);
env->hflags |= HF_MPX_IU_MASK;
} else {
@ -1458,9 +1458,9 @@ void helper_xrstor(CPUX86State *env, target_ulong ptr, uint64_t rfbm)
env->hflags &= ~HF_MPX_IU_MASK;
}
}
if (rfbm & XSTATE_BNDCSR) {
if (xstate_bv & XSTATE_BNDCSR) {
target_ulong off = x86_ext_save_areas[XSTATE_BNDCSR].offset;
if (rfbm & XSTATE_BNDCSR_MASK) {
if (xstate_bv & XSTATE_BNDCSR_MASK) {
target_ulong off = x86_ext_save_areas[XSTATE_BNDCSR_BIT].offset;
do_xrstor_bndcsr(env, ptr + off, ra);
} else {
memset(&env->bndcs_regs, 0, sizeof(env->bndcs_regs));
@ -1499,7 +1499,7 @@ void helper_xsetbv(CPUX86State *env, uint32_t ecx, uint64_t mask)
}
/* Only XCR0 is defined at present; the FPU may not be disabled. */
if (ecx != 0 || (mask & XSTATE_FP) == 0) {
if (ecx != 0 || (mask & XSTATE_FP_MASK) == 0) {
goto do_gpf;
}
@ -1511,7 +1511,8 @@ void helper_xsetbv(CPUX86State *env, uint32_t ecx, uint64_t mask)
}
/* Disallow enabling only half of MPX. */
if ((mask ^ (mask * (XSTATE_BNDCSR / XSTATE_BNDREGS))) & XSTATE_BNDCSR) {
if ((mask ^ (mask * (XSTATE_BNDCSR_MASK / XSTATE_BNDREGS_MASK)))
& XSTATE_BNDCSR_MASK) {
goto do_gpf;
}

2
qemu/target-i386/mpx_helper.c
View file

@ -35,7 +35,7 @@ void cpu_sync_bndcs_hflags(CPUX86State *env)
}
if ((env->cr[4] & CR4_OSXSAVE_MASK)
&& (env->xcr0 & XSTATE_BNDCSR)
&& (env->xcr0 & XSTATE_BNDCSR_MASK)
&& (bndcsr & BNDCFG_ENABLE)) {
hflags |= HF_MPX_EN_MASK;
} else {