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target/ppc/mmu_common: Fix SRR1/MSR error code on Book-E

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Book-E architecture does not set the error code in 31:27 bits
of SRR1, but instead uses these bits for custom fields such
as GS (Guest Supervisor).

Wrongly setting these fields will result in QEMU crashes
when attempting to execute not executable code due to the attempts
to use Guest Supervisor mode.

Cc: "Cédric Le Goater" <clg@kaod.org>
Cc: Daniel Henrique Barboza <danielhb413@gmail.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Greg Kurz <groug@kaod.org>
Cc: qemu-ppc@nongnu.org
Cc: qemu-devel@nongnu.org
Cc: qemu-stable@nongnu.org
Signed-off-by: Vitaly Cheptsov <cheptsov@ispras.ru>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20220121093107.15478-1-cheptsov@ispras.ru>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
Vitaly Cheptsov 2022-01-28 13:15:02 +01:00 • committed by Cédric Le Goater
parent 5aad0457ec
commit e31ea5d89b
1 changed files with 15 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

18
target/ppc/mmu_common.c
View file

@ -1367,22 +1367,34 @@ static bool ppc_jumbo_xlate(PowerPCCPU *cpu, vaddr eaddr,
case -2:
/* Access rights violation */
cs->exception_index = POWERPC_EXCP_ISI;
env->error_code = 0x08000000;
if ((env->mmu_model == POWERPC_MMU_BOOKE) ||
(env->mmu_model == POWERPC_MMU_BOOKE206)) {
env->error_code = 0;
} else {
env->error_code = 0x08000000;
}
break;
case -3:
/* No execute protection violation */
if ((env->mmu_model == POWERPC_MMU_BOOKE) ||
(env->mmu_model == POWERPC_MMU_BOOKE206)) {
env->spr[SPR_BOOKE_ESR] = 0x00000000;
env->error_code = 0;
} else {
env->error_code = 0x10000000;
}
cs->exception_index = POWERPC_EXCP_ISI;
env->error_code = 0x10000000;
break;
case -4:
/* Direct store exception */
/* No code fetch is allowed in direct-store areas */
cs->exception_index = POWERPC_EXCP_ISI;
env->error_code = 0x10000000;
if ((env->mmu_model == POWERPC_MMU_BOOKE) ||
(env->mmu_model == POWERPC_MMU_BOOKE206)) {
env->error_code = 0;
} else {
env->error_code = 0x10000000;
}
break;
}
} else {