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target/ppc: Disconnect hflags from MSR 

Copying flags directly from msr has drawbacks: (1) msr bits
mean different things per cpu, (2) msr has 64 bits on 64 cpus
while tb->flags has only 32 bits.

Create a enum to define these bits.  Document the origin of each bit
and validate those bits that must match MSR.  This fixes the
truncation of env->hflags to tb->flags, because we no longer
have hflags bits set above bit 31.

Most of the code in ppc_tr_init_disas_context is moved over to
hreg_compute_hflags.  Some of it is simple extractions from msr,
some requires examining other cpu flags.  Anything that is moved
becomes a simple extract from hflags in ppc_tr_init_disas_context.

Several existing bugs are left in ppc_tr_init_disas_context, where
additional changes are required -- to be addressed in future patches.

Remove a broken #if 0 block.

Reported-by: Ivan Warren <ivan@vmfacility.fr>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210323184340.619757-3-richard.henderson@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Richard Henderson 2021-03-23 12:43:32 -06:00 committed by David Gibson
parent edece45d4a
commit 2df4fe7abe
3 changed files with 95 additions and 50 deletions
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25
target/ppc/cpu.h
View File

@ -585,6 +585,31 @@ enum {
POWERPC_FLAG_HID0_LE = 0x00400000,
};
/*
* Bits for env->hflags.
*
* Most of these bits overlap with corresponding bits in MSR,
* but some come from other sources. Those that do come from
* the MSR are validated in hreg_compute_hflags.
*/
enum {
HFLAGS_LE = 0, /* MSR_LE -- comes from elsewhere on 601 */
HFLAGS_HV = 1, /* computed from MSR_HV and other state */
HFLAGS_64 = 2, /* computed from MSR_CE and MSR_SF */
HFLAGS_DR = 4, /* MSR_DR */
HFLAGS_IR = 5, /* MSR_IR */
HFLAGS_SPE = 6, /* from MSR_SPE if cpu has SPE; avoid overlap w/ MSR_VR */
HFLAGS_VSX = 7, /* from MSR_VSX if cpu has VSX; avoid overlap w/ MSR_AP */
HFLAGS_TM = 8, /* computed from MSR_TM */
HFLAGS_BE = 9, /* MSR_BE -- from elsewhere on embedded ppc */
HFLAGS_SE = 10, /* MSR_SE -- from elsewhere on embedded ppc */
HFLAGS_FP = 13, /* MSR_FP */
HFLAGS_PR = 14, /* MSR_PR */
HFLAGS_SA = 22, /* MSR_SA */
HFLAGS_AP = 23, /* MSR_AP */
HFLAGS_VR = 25, /* MSR_VR if cpu has VRE */
};
/*****************************************************************************/
/* Floating point status and control register */
#define FPSCR_DRN2 34 /* Decimal Floating-Point rounding control */

65
target/ppc/helper_regs.c
View File

@ -18,6 +18,7 @@
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "qemu/main-loop.h"
#include "exec/exec-all.h"
#include "sysemu/kvm.h"
@ -87,24 +88,66 @@ void hreg_compute_mem_idx(CPUPPCState *env)
void hreg_compute_hflags(CPUPPCState *env)
{
target_ulong hflags_mask;
target_ulong msr = env->msr;
uint32_t ppc_flags = env->flags;
uint32_t hflags = 0;
uint32_t msr_mask;
/* We 'forget' FE0 & FE1: we'll never generate imprecise exceptions */
hflags_mask = (1 << MSR_VR) | (1 << MSR_AP) | (1 << MSR_SA) |
(1 << MSR_PR) | (1 << MSR_FP) | (1 << MSR_SE) | (1 << MSR_BE) |
(1 << MSR_LE) | (1 << MSR_VSX) | (1 << MSR_IR) | (1 << MSR_DR);
hflags_mask |= (1ULL << MSR_CM) | (1ULL << MSR_SF) | MSR_HVB;
hreg_compute_mem_idx(env);
env->hflags = env->msr & hflags_mask;
/* Some bits come straight across from MSR. */
QEMU_BUILD_BUG_ON(MSR_LE != HFLAGS_LE);
QEMU_BUILD_BUG_ON(MSR_PR != HFLAGS_PR);
QEMU_BUILD_BUG_ON(MSR_DR != HFLAGS_DR);
QEMU_BUILD_BUG_ON(MSR_IR != HFLAGS_IR);
QEMU_BUILD_BUG_ON(MSR_FP != HFLAGS_FP);
QEMU_BUILD_BUG_ON(MSR_SA != HFLAGS_SA);
QEMU_BUILD_BUG_ON(MSR_AP != HFLAGS_AP);
msr_mask = ((1 << MSR_LE) | (1 << MSR_PR) |
(1 << MSR_DR) | (1 << MSR_IR) |
(1 << MSR_FP) | (1 << MSR_SA) | (1 << MSR_AP));
if (env->flags & POWERPC_FLAG_HID0_LE) {
if (ppc_flags & POWERPC_FLAG_HID0_LE) {
/*
* Note that MSR_LE is not set in env->msr_mask for this cpu,
* and so will never be set in msr or hflags at this point.
* and so will never be set in msr.
*/
uint32_t le = extract32(env->spr[SPR_HID0], 3, 1);
env->hflags |= le << MSR_LE;
hflags |= le << MSR_LE;
}
if (ppc_flags & POWERPC_FLAG_BE) {
QEMU_BUILD_BUG_ON(MSR_BE != HFLAGS_BE);
msr_mask |= 1 << MSR_BE;
}
if (ppc_flags & POWERPC_FLAG_SE) {
QEMU_BUILD_BUG_ON(MSR_SE != HFLAGS_SE);
msr_mask |= 1 << MSR_SE;
}
if (msr_is_64bit(env, msr)) {
hflags |= 1 << HFLAGS_64;
}
if ((ppc_flags & POWERPC_FLAG_SPE) && (msr & (1 << MSR_SPE))) {
hflags |= 1 << HFLAGS_SPE;
}
if (ppc_flags & POWERPC_FLAG_VRE) {
QEMU_BUILD_BUG_ON(MSR_VR != HFLAGS_VR);
msr_mask |= 1 << MSR_VR;
}
if ((ppc_flags & POWERPC_FLAG_VSX) && (msr & (1 << MSR_VSX))) {
hflags |= 1 << HFLAGS_VSX;
}
if ((ppc_flags & POWERPC_FLAG_TM) && (msr & (1ull << MSR_TM))) {
hflags |= 1 << HFLAGS_TM;
}
#ifndef CONFIG_USER_ONLY
if (!env->has_hv_mode || (msr & (1ull << MSR_HV))) {
hflags |= 1 << HFLAGS_HV;
}
#endif
env->hflags = hflags | (msr & msr_mask);
hreg_compute_mem_idx(env);
}
void cpu_interrupt_exittb(CPUState *cs)

55
target/ppc/translate.c
View File

@ -7879,67 +7879,48 @@ static void ppc_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
{
DisasContext *ctx = container_of(dcbase, DisasContext, base);
CPUPPCState *env = cs->env_ptr;
uint32_t hflags = ctx->base.tb->flags;
int bound;
ctx->exception = POWERPC_EXCP_NONE;
ctx->spr_cb = env->spr_cb;
ctx->pr = msr_pr;
ctx->pr = (hflags >> HFLAGS_PR) & 1;
ctx->mem_idx = env->dmmu_idx;
ctx->dr = msr_dr;
#if !defined(CONFIG_USER_ONLY)
ctx->hv = msr_hv || !env->has_hv_mode;
#endif
ctx->dr = (hflags >> HFLAGS_DR) & 1;
ctx->hv = (hflags >> HFLAGS_HV) & 1;
ctx->insns_flags = env->insns_flags;
ctx->insns_flags2 = env->insns_flags2;
ctx->access_type = -1;
ctx->need_access_type = !mmu_is_64bit(env->mmu_model);
ctx->le_mode = !!(env->hflags & (1 << MSR_LE));
ctx->le_mode = (hflags >> HFLAGS_LE) & 1;
ctx->default_tcg_memop_mask = ctx->le_mode ? MO_LE : MO_BE;
ctx->flags = env->flags;
#if defined(TARGET_PPC64)
ctx->sf_mode = msr_is_64bit(env, env->msr);
ctx->sf_mode = (hflags >> HFLAGS_64) & 1;
ctx->has_cfar = !!(env->flags & POWERPC_FLAG_CFAR);
#endif
ctx->lazy_tlb_flush = env->mmu_model == POWERPC_MMU_32B
|| env->mmu_model == POWERPC_MMU_601
|| env->mmu_model & POWERPC_MMU_64;
ctx->fpu_enabled = !!msr_fp;
if ((env->flags & POWERPC_FLAG_SPE) && msr_spe) {
ctx->spe_enabled = !!msr_spe;
} else {
ctx->spe_enabled = false;
}
if ((env->flags & POWERPC_FLAG_VRE) && msr_vr) {
ctx->altivec_enabled = !!msr_vr;
} else {
ctx->altivec_enabled = false;
}
if ((env->flags & POWERPC_FLAG_VSX) && msr_vsx) {
ctx->vsx_enabled = !!msr_vsx;
} else {
ctx->vsx_enabled = false;
}
ctx->fpu_enabled = (hflags >> HFLAGS_FP) & 1;
ctx->spe_enabled = (hflags >> HFLAGS_SPE) & 1;
ctx->altivec_enabled = (hflags >> HFLAGS_VR) & 1;
ctx->vsx_enabled = (hflags >> HFLAGS_VSX) & 1;
if ((env->flags & POWERPC_FLAG_SCV)
&& (env->spr[SPR_FSCR] & (1ull << FSCR_SCV))) {
ctx->scv_enabled = true;
} else {
ctx->scv_enabled = false;
}
#if defined(TARGET_PPC64)
if ((env->flags & POWERPC_FLAG_TM) && msr_tm) {
ctx->tm_enabled = !!msr_tm;
} else {
ctx->tm_enabled = false;
}
#endif
ctx->tm_enabled = (hflags >> HFLAGS_TM) & 1;
ctx->gtse = !!(env->spr[SPR_LPCR] & LPCR_GTSE);
if ((env->flags & POWERPC_FLAG_SE) && msr_se) {
ctx->singlestep_enabled = CPU_SINGLE_STEP;
} else {
ctx->singlestep_enabled = 0;
ctx->singlestep_enabled = 0;
if ((hflags >> HFLAGS_SE) & 1) {
ctx->singlestep_enabled |= CPU_SINGLE_STEP;
}
if ((env->flags & POWERPC_FLAG_BE) && msr_be) {
if ((hflags >> HFLAGS_BE) & 1) {
ctx->singlestep_enabled |= CPU_BRANCH_STEP;
}
if ((env->flags & POWERPC_FLAG_DE) && msr_de) {
@ -7956,10 +7937,6 @@ static void ppc_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
if (unlikely(ctx->base.singlestep_enabled)) {
ctx->singlestep_enabled |= GDBSTUB_SINGLE_STEP;
}
#if defined(DO_SINGLE_STEP) && 0
/* Single step trace mode */
msr_se = 1;
#endif
bound = -(ctx->base.pc_first | TARGET_PAGE_MASK) / 4;
ctx->base.max_insns = MIN(ctx->base.max_insns, bound);