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target-arm: Make singlestate TB flags common between AArch32/64

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Currently we keep the TB flags PSTATE_SS and SS_ACTIVE in different
bit positions for AArch64 and AArch32. Replace these separate
definitions with a single common flag in the upper part of the
flags word.

Backports commit 3cf6a0fcedd429693d439556543400d5f0e31e1d from qemu
This commit is contained in:
Peter Maydell 2018-02-12 22:57:23 -05:00 committed by Lioncash
parent 8c674b105c
commit a41d967577
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 29 additions and 44 deletions
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69
qemu/target-arm/cpu.h
View file

@ -1762,6 +1762,10 @@ static inline bool arm_singlestep_active(CPUARMState *env)
#define ARM_TBFLAG_AARCH64_STATE_MASK (1U << ARM_TBFLAG_AARCH64_STATE_SHIFT)
#define ARM_TBFLAG_MMUIDX_SHIFT 28
#define ARM_TBFLAG_MMUIDX_MASK (0x7 << ARM_TBFLAG_MMUIDX_SHIFT)
#define ARM_TBFLAG_SS_ACTIVE_SHIFT 27
#define ARM_TBFLAG_SS_ACTIVE_MASK (1 << ARM_TBFLAG_SS_ACTIVE_SHIFT)
#define ARM_TBFLAG_PSTATE_SS_SHIFT 26
#define ARM_TBFLAG_PSTATE_SS_MASK (1 << ARM_TBFLAG_PSTATE_SS_SHIFT)
/* Bit usage when in AArch32 state: */
#define ARM_TBFLAG_THUMB_SHIFT 0
@ -1778,10 +1782,6 @@ static inline bool arm_singlestep_active(CPUARMState *env)
#define ARM_TBFLAG_BSWAP_CODE_MASK (1 << ARM_TBFLAG_BSWAP_CODE_SHIFT)
#define ARM_TBFLAG_CPACR_FPEN_SHIFT 17
#define ARM_TBFLAG_CPACR_FPEN_MASK (1 << ARM_TBFLAG_CPACR_FPEN_SHIFT)
#define ARM_TBFLAG_SS_ACTIVE_SHIFT 18
#define ARM_TBFLAG_SS_ACTIVE_MASK (1 << ARM_TBFLAG_SS_ACTIVE_SHIFT)
#define ARM_TBFLAG_PSTATE_SS_SHIFT 19
#define ARM_TBFLAG_PSTATE_SS_MASK (1 << ARM_TBFLAG_PSTATE_SS_SHIFT)
/* We store the bottom two bits of the CPAR as TB flags and handle
* checks on the other bits at runtime
*/
@ -1797,16 +1797,16 @@ static inline bool arm_singlestep_active(CPUARMState *env)
/* Bit usage when in AArch64 state */
#define ARM_TBFLAG_AA64_FPEN_SHIFT 2
#define ARM_TBFLAG_AA64_FPEN_MASK (1 << ARM_TBFLAG_AA64_FPEN_SHIFT)
#define ARM_TBFLAG_AA64_SS_ACTIVE_SHIFT 3
#define ARM_TBFLAG_AA64_SS_ACTIVE_MASK (1 << ARM_TBFLAG_AA64_SS_ACTIVE_SHIFT)
#define ARM_TBFLAG_AA64_PSTATE_SS_SHIFT 4
#define ARM_TBFLAG_AA64_PSTATE_SS_MASK (1 << ARM_TBFLAG_AA64_PSTATE_SS_SHIFT)
/* some convenience accessor macros */
#define ARM_TBFLAG_AARCH64_STATE(F) \
(((F) & ARM_TBFLAG_AARCH64_STATE_MASK) >> ARM_TBFLAG_AARCH64_STATE_SHIFT)
#define ARM_TBFLAG_MMUIDX(F) \
(((F) & ARM_TBFLAG_MMUIDX_MASK) >> ARM_TBFLAG_MMUIDX_SHIFT)
#define ARM_TBFLAG_SS_ACTIVE(F) \
(((F) & ARM_TBFLAG_SS_ACTIVE_MASK) >> ARM_TBFLAG_SS_ACTIVE_SHIFT)
#define ARM_TBFLAG_PSTATE_SS(F) \
(((F) & ARM_TBFLAG_PSTATE_SS_MASK) >> ARM_TBFLAG_PSTATE_SS_SHIFT)
#define ARM_TBFLAG_THUMB(F) \
(((F) & ARM_TBFLAG_THUMB_MASK) >> ARM_TBFLAG_THUMB_SHIFT)
#define ARM_TBFLAG_VECLEN(F) \
@ -1821,18 +1821,10 @@ static inline bool arm_singlestep_active(CPUARMState *env)
(((F) & ARM_TBFLAG_BSWAP_CODE_MASK) >> ARM_TBFLAG_BSWAP_CODE_SHIFT)
#define ARM_TBFLAG_CPACR_FPEN(F) \
(((F) & ARM_TBFLAG_CPACR_FPEN_MASK) >> ARM_TBFLAG_CPACR_FPEN_SHIFT)
#define ARM_TBFLAG_SS_ACTIVE(F) \
(((F) & ARM_TBFLAG_SS_ACTIVE_MASK) >> ARM_TBFLAG_SS_ACTIVE_SHIFT)
#define ARM_TBFLAG_PSTATE_SS(F) \
(((F) & ARM_TBFLAG_PSTATE_SS_MASK) >> ARM_TBFLAG_PSTATE_SS_SHIFT)
#define ARM_TBFLAG_XSCALE_CPAR(F) \
(((F) & ARM_TBFLAG_XSCALE_CPAR_MASK) >> ARM_TBFLAG_XSCALE_CPAR_SHIFT)
#define ARM_TBFLAG_AA64_FPEN(F) \
(((F) & ARM_TBFLAG_AA64_FPEN_MASK) >> ARM_TBFLAG_AA64_FPEN_SHIFT)
#define ARM_TBFLAG_AA64_SS_ACTIVE(F) \
(((F) & ARM_TBFLAG_AA64_SS_ACTIVE_MASK) >> ARM_TBFLAG_AA64_SS_ACTIVE_SHIFT)
#define ARM_TBFLAG_AA64_PSTATE_SS(F) \
(((F) & ARM_TBFLAG_AA64_PSTATE_SS_MASK) >> ARM_TBFLAG_AA64_PSTATE_SS_SHIFT)
#define ARM_TBFLAG_NS(F) \
(((F) & ARM_TBFLAG_NS_MASK) >> ARM_TBFLAG_NS_SHIFT)
@ -1854,19 +1846,6 @@ static inline void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc,
if (fpen == 3 || (fpen == 1 && arm_current_el(env) != 0)) {
*flags |= ARM_TBFLAG_AA64_FPEN_MASK;
}
/* The SS_ACTIVE and PSTATE_SS bits correspond to the state machine
* states defined in the ARM ARM for software singlestep:
* SS_ACTIVE PSTATE.SS State
* 0 x Inactive (the TB flag for SS is always 0)
* 1 0 Active-pending
* 1 1 Active-not-pending
*/
if (arm_singlestep_active(env)) {
*flags |= ARM_TBFLAG_AA64_SS_ACTIVE_MASK;
if (env->pstate & PSTATE_SS) {
*flags |= ARM_TBFLAG_AA64_PSTATE_SS_MASK;
}
}
} else {
*pc = env->regs[15];
*flags = (env->thumb << ARM_TBFLAG_THUMB_SHIFT)
@ -1884,24 +1863,30 @@ static inline void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc,
if (fpen == 3 || (fpen == 1 && arm_current_el(env) != 0)) {
*flags |= ARM_TBFLAG_CPACR_FPEN_MASK;
}
/* The SS_ACTIVE and PSTATE_SS bits correspond to the state machine
* states defined in the ARM ARM for software singlestep:
* SS_ACTIVE PSTATE.SS State
* 0 x Inactive (the TB flag for SS is always 0)
* 1 0 Active-pending
* 1 1 Active-not-pending
*/
if (arm_singlestep_active(env)) {
*flags |= ARM_TBFLAG_SS_ACTIVE_MASK;
if (env->uncached_cpsr & PSTATE_SS) {
*flags |= ARM_TBFLAG_PSTATE_SS_MASK;
}
}
*flags |= (extract32(env->cp15.c15_cpar, 0, 2)
<< ARM_TBFLAG_XSCALE_CPAR_SHIFT);
}
*flags |= (cpu_mmu_index(env) << ARM_TBFLAG_MMUIDX_SHIFT);
/* The SS_ACTIVE and PSTATE_SS bits correspond to the state machine
* states defined in the ARM ARM for software singlestep:
* SS_ACTIVE PSTATE.SS State
* 0 x Inactive (the TB flag for SS is always 0)
* 1 0 Active-pending
* 1 1 Active-not-pending
*/
if (arm_singlestep_active(env)) {
*flags |= ARM_TBFLAG_SS_ACTIVE_MASK;
if (is_a64(env)) {
if (env->pstate & PSTATE_SS) {
*flags |= ARM_TBFLAG_PSTATE_SS_MASK;
}
} else {
if (env->uncached_cpsr & PSTATE_SS) {
*flags |= ARM_TBFLAG_PSTATE_SS_MASK;
}
}
}
*cs_base = 0;
}

4
qemu/target-arm/translate-a64.c
View file

@ -11246,8 +11246,8 @@ void gen_intermediate_code_internal_a64(ARMCPU *cpu,
* emit code to generate a software step exception
* end the TB
*/
dc->ss_active = ARM_TBFLAG_AA64_SS_ACTIVE(tb->flags);
dc->pstate_ss = ARM_TBFLAG_AA64_PSTATE_SS(tb->flags);
dc->ss_active = ARM_TBFLAG_SS_ACTIVE(tb->flags);
dc->pstate_ss = ARM_TBFLAG_PSTATE_SS(tb->flags);
dc->is_ldex = false;
dc->ss_same_el = (arm_debug_target_el(env) == dc->current_el);