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target/arm: Add PAuth active bit to tbflags

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There are 5 bits of state that could be added, but to save
space within tbflags, add only a single enable bit.
Helpers will determine the rest of the state at runtime.

Backports commit 0816ef1bfcd3ac53e7454b62ca436727887f6056 from qemu
This commit is contained in:
Richard Henderson 2019-01-22 15:15:57 -05:00 committed by Lioncash
parent 54721be30e
commit e6ffbc22c2
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GPG key ID: 4E3C3CC1031BA9C7
4 changed files with 23 additions and 0 deletions
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1
qemu/target/arm/cpu.h
View file

@ -2962,6 +2962,7 @@ FIELD(TBFLAG_A64, TBI0, 0, 1)
FIELD(TBFLAG_A64, TBI1, 1, 1)
FIELD(TBFLAG_A64, SVEEXC_EL, 2, 2)
FIELD(TBFLAG_A64, ZCR_LEN, 4, 4)
FIELD(TBFLAG_A64, PAUTH_ACTIVE, 8, 1)
static inline bool bswap_code(bool sctlr_b)
{

19
qemu/target/arm/helper.c
View file

@ -12187,6 +12187,25 @@ void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc,
flags = FIELD_DP32(flags, TBFLAG_A64, SVEEXC_EL, sve_el);
flags = FIELD_DP32(flags, TBFLAG_A64, ZCR_LEN, zcr_len);
}
if (cpu_isar_feature(aa64_pauth, cpu)) {
/*
* In order to save space in flags, we record only whether
* pauth is "inactive", meaning all insns are implemented as
* a nop, or "active" when some action must be performed.
* The decision of which action to take is left to a helper.
*/
uint64_t sctlr;
if (current_el == 0) {
/* FIXME: ARMv8.1-VHE S2 translation regime. */
sctlr = env->cp15.sctlr_el[1];
} else {
sctlr = env->cp15.sctlr_el[current_el];
}
if (sctlr & (SCTLR_EnIA | SCTLR_EnIB | SCTLR_EnDA | SCTLR_EnDB)) {
flags = FIELD_DP32(flags, TBFLAG_A64, PAUTH_ACTIVE, 1);
}
}
} else {
*pc = env->regs[15];
flags = FIELD_DP32(flags, TBFLAG_A32, THUMB, env->thumb);

1
qemu/target/arm/translate-a64.c
View file

@ -13599,6 +13599,7 @@ static void aarch64_tr_init_disas_context(DisasContextBase *dcbase,
dc->fp_excp_el = FIELD_EX32(tb_flags, TBFLAG_ANY, FPEXC_EL);
dc->sve_excp_el = FIELD_EX32(tb_flags, TBFLAG_A64, SVEEXC_EL);
dc->sve_len = (FIELD_EX32(tb_flags, TBFLAG_A64, ZCR_LEN) + 1) * 16;
dc->pauth_active = FIELD_EX32(tb_flags, TBFLAG_A64, PAUTH_ACTIVE);
dc->vec_len = 0;
dc->vec_stride = 0;
dc->cp_regs = arm_cpu->cp_regs;

2
qemu/target/arm/translate.h
View file

@ -67,6 +67,8 @@ typedef struct DisasContext {
bool is_ldex;
/* True if a single-step exception will be taken to the current EL */
bool ss_same_el;
/* True if v8.3-PAuth is active. */
bool pauth_active;
/* Bottom two bits of XScale c15_cpar coprocessor access control reg */
int c15_cpar;
/* TCG op of the current insn_start. */