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linux-user/aarch64: Implement PR_TAGGED_ADDR_ENABLE

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This is the prctl bit that controls whether syscalls accept tagged
addresses.  See Documentation/arm64/tagged-address-abi.rst in the
linux kernel.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210212184902.1251044-21-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2021-02-12 10:48:51 -08:00 • committed by Peter Maydell
parent 31c048342d
commit 0e0c030c68
4 changed files with 62 additions and 0 deletions
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4
linux-user/aarch64/target_syscall.h
View file

@ -30,4 +30,8 @@ struct target_pt_regs {
# define TARGET_PR_PAC_APDBKEY (1 << 3)
# define TARGET_PR_PAC_APGAKEY (1 << 4)
#define TARGET_PR_SET_TAGGED_ADDR_CTRL 55
#define TARGET_PR_GET_TAGGED_ADDR_CTRL 56
# define TARGET_PR_TAGGED_ADDR_ENABLE (1UL << 0)
#endif /* AARCH64_TARGET_SYSCALL_H */

24
linux-user/syscall.c
View file

@ -10993,6 +10993,30 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
}
}
return -TARGET_EINVAL;
case TARGET_PR_SET_TAGGED_ADDR_CTRL:
{
abi_ulong valid_mask = TARGET_PR_TAGGED_ADDR_ENABLE;
CPUARMState *env = cpu_env;
if ((arg2 & ~valid_mask) || arg3 || arg4 || arg5) {
return -TARGET_EINVAL;
}
env->tagged_addr_enable = arg2 & TARGET_PR_TAGGED_ADDR_ENABLE;
return 0;
}
case TARGET_PR_GET_TAGGED_ADDR_CTRL:
{
abi_long ret = 0;
CPUARMState *env = cpu_env;
if (arg2 || arg3 || arg4 || arg5) {
return -TARGET_EINVAL;
}
if (env->tagged_addr_enable) {
ret |= TARGET_PR_TAGGED_ADDR_ENABLE;
}
return ret;
}
#endif /* AARCH64 */
case PR_GET_SECCOMP:
case PR_SET_SECCOMP: