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linux-user/aarch64: Implement PR_MTE_TCF and PR_MTE_TAG 

These prctl fields are required for the function of MTE.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210212184902.1251044-24-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
master
Richard Henderson 2021-02-12 10:48:54 -08:00 committed by Peter Maydell
parent 16c8497848
commit bfd0572f43
2 changed files with 52 additions and 0 deletions
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9
linux-user/aarch64/target_syscall.h
View File

@ -33,5 +33,14 @@ struct target_pt_regs {
#define TARGET_PR_SET_TAGGED_ADDR_CTRL 55
#define TARGET_PR_GET_TAGGED_ADDR_CTRL 56
# define TARGET_PR_TAGGED_ADDR_ENABLE (1UL << 0)
/* MTE tag check fault modes */
# define TARGET_PR_MTE_TCF_SHIFT 1
# define TARGET_PR_MTE_TCF_NONE (0UL << TARGET_PR_MTE_TCF_SHIFT)
# define TARGET_PR_MTE_TCF_SYNC (1UL << TARGET_PR_MTE_TCF_SHIFT)
# define TARGET_PR_MTE_TCF_ASYNC (2UL << TARGET_PR_MTE_TCF_SHIFT)
# define TARGET_PR_MTE_TCF_MASK (3UL << TARGET_PR_MTE_TCF_SHIFT)
/* MTE tag inclusion mask */
# define TARGET_PR_MTE_TAG_SHIFT 3
# define TARGET_PR_MTE_TAG_MASK (0xffffUL << TARGET_PR_MTE_TAG_SHIFT)
#endif /* AARCH64_TARGET_SYSCALL_H */

43
linux-user/syscall.c
View File

@ -10997,17 +10997,53 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
{
abi_ulong valid_mask = TARGET_PR_TAGGED_ADDR_ENABLE;
CPUARMState *env = cpu_env;
ARMCPU *cpu = env_archcpu(env);
if (cpu_isar_feature(aa64_mte, cpu)) {
valid_mask |= TARGET_PR_MTE_TCF_MASK;
valid_mask |= TARGET_PR_MTE_TAG_MASK;
}
if ((arg2 & ~valid_mask) || arg3 || arg4 || arg5) {
return -TARGET_EINVAL;
}
env->tagged_addr_enable = arg2 & TARGET_PR_TAGGED_ADDR_ENABLE;
if (cpu_isar_feature(aa64_mte, cpu)) {
switch (arg2 & TARGET_PR_MTE_TCF_MASK) {
case TARGET_PR_MTE_TCF_NONE:
case TARGET_PR_MTE_TCF_SYNC:
case TARGET_PR_MTE_TCF_ASYNC:
break;
default:
return -EINVAL;
}
/*
* Write PR_MTE_TCF to SCTLR_EL1[TCF0].
* Note that the syscall values are consistent with hw.
*/
env->cp15.sctlr_el[1] =
deposit64(env->cp15.sctlr_el[1], 38, 2,
arg2 >> TARGET_PR_MTE_TCF_SHIFT);
/*
* Write PR_MTE_TAG to GCR_EL1[Exclude].
* Note that the syscall uses an include mask,
* and hardware uses an exclude mask -- invert.
*/
env->cp15.gcr_el1 =
deposit64(env->cp15.gcr_el1, 0, 16,
~arg2 >> TARGET_PR_MTE_TAG_SHIFT);
arm_rebuild_hflags(env);
}
return 0;
}
case TARGET_PR_GET_TAGGED_ADDR_CTRL:
{
abi_long ret = 0;
CPUARMState *env = cpu_env;
ARMCPU *cpu = env_archcpu(env);
if (arg2 || arg3 || arg4 || arg5) {
return -TARGET_EINVAL;
@ -11015,6 +11051,13 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
if (env->tagged_addr_enable) {
ret |= TARGET_PR_TAGGED_ADDR_ENABLE;
}
if (cpu_isar_feature(aa64_mte, cpu)) {
/* See above. */
ret |= (extract64(env->cp15.sctlr_el[1], 38, 2)
<< TARGET_PR_MTE_TCF_SHIFT);
ret = deposit64(ret, TARGET_PR_MTE_TAG_SHIFT, 16,
~env->cp15.gcr_el1);
}
return ret;
}
#endif /* AARCH64 */