diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2021-02-12 10:48:51 -0800 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2021-02-16 13:06:16 +0000 |
| commit | 0e0c030c681730f3ec55ba3b223b608a8f3e8282 (patch) | |
| tree | b787487c814a2833973d96d3ef135cd784d5f46a /linux-user | |
| parent | 31c048342db09e70ab887aba9c7e0818c18d0fb1 (diff) | |
linux-user/aarch64: Implement PR_TAGGED_ADDR_ENABLE
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>
Diffstat (limited to 'linux-user')
| -rw-r--r-- | linux-user/aarch64/target_syscall.h | 4 | ||||
| -rw-r--r-- | linux-user/syscall.c | 24 |
2 files changed, 28 insertions, 0 deletions
diff --git a/linux-user/aarch64/target_syscall.h b/linux-user/aarch64/target_syscall.h index 3194e6b009..820601dfcc 100644 --- a/linux-user/aarch64/target_syscall.h +++ b/linux-user/aarch64/target_syscall.h @@ -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 */ diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 3d0411da57..cf0b39461b 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -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: |