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Re: [Qemu-devel] [Qemu-arm] [PATCH 13/13] target/arm/arm-semi: Implement
From: |
Alex Bennée |
Subject: |
Re: [Qemu-devel] [Qemu-arm] [PATCH 13/13] target/arm/arm-semi: Implement SH_EXT_EXIT_EXTENDED extension |
Date: |
Thu, 12 Sep 2019 13:07:58 +0100 |
User-agent: |
mu4e 1.3.4; emacs 27.0.50 |
Peter Maydell <address@hidden> writes:
> SH_EXT_EXIT_EXTENDED is a v2.0 semihosting extension: it
> indicates that the implementation supports the SYS_EXIT_EXTENDED
> function. This function allows both A64 and A32/T32 guests to
> exit with a specified exit status, unlike the older SYS_EXIT
> function which only allowed this for A64 guests. Implement
> this extension.
>
> Signed-off-by: Peter Maydell <address@hidden>
Aside from the ordering nit mentioned in the previous commit:
Reviewed-by: Alex Bennée <address@hidden>
> ---
> target/arm/arm-semi.c | 16 +++++++++++-----
> 1 file changed, 11 insertions(+), 5 deletions(-)
>
> diff --git a/target/arm/arm-semi.c b/target/arm/arm-semi.c
> index 0df8d4d69d6..3900bd4e1e6 100644
> --- a/target/arm/arm-semi.c
> +++ b/target/arm/arm-semi.c
> @@ -66,6 +66,7 @@ typedef void TaskState;
> #define TARGET_SYS_HEAPINFO 0x16
> #define TARGET_SYS_EXIT 0x18
> #define TARGET_SYS_SYNCCACHE 0x19
> +#define TARGET_SYS_EXIT_EXTENDED 0x20
>
> /* ADP_Stopped_ApplicationExit is used for exit(0),
> * anything else is implemented as exit(1) */
> @@ -485,7 +486,7 @@ static const uint8_t featurefile_data[] = {
> SHFB_MAGIC_1,
> SHFB_MAGIC_2,
> SHFB_MAGIC_3,
> - SH_EXT_STDOUT_STDERR, /* Feature byte 0 */
> + SH_EXT_EXIT_EXTENDED | SH_EXT_STDOUT_STDERR, /* Feature byte 0 */
> };
>
> static void init_featurefile_guestfd(int guestfd)
> @@ -1026,11 +1027,14 @@ target_ulong do_arm_semihosting(CPUARMState *env)
> return 0;
> }
> case TARGET_SYS_EXIT:
> - if (is_a64(env)) {
> + case TARGET_SYS_EXIT_EXTENDED:
> + if (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(env)) {
> /*
> - * The A64 version of this call takes a parameter block,
> + * The A64 version of SYS_EXIT takes a parameter block,
> * so the application-exit type can return a subcode which
> * is the exit status code from the application.
> + * SYS_EXIT_EXTENDED is an a new-in-v2.0 optional function
> + * which allows A32/T32 guests to also provide a status code.
> */
> GET_ARG(0);
> GET_ARG(1);
> @@ -1042,8 +1046,10 @@ target_ulong do_arm_semihosting(CPUARMState *env)
> }
> } else {
> /*
> - * ARM specifies only Stopped_ApplicationExit as normal
> - * exit, everything else is considered an error
> + * The A32/T32 version of SYS_EXIT specifies only
> + * Stopped_ApplicationExit as normal exit, but does not
> + * allow the guest to specify the exit status code.
> + * Everything else is considered an error.
> */
> ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1;
> }
--
Alex Bennée
- [Qemu-devel] [PATCH 07/13] target/arm/arm-semi: Factor out implementation of SYS_READ, (continued)
- [Qemu-devel] [PATCH 07/13] target/arm/arm-semi: Factor out implementation of SYS_READ, Peter Maydell, 2019/09/10
- [Qemu-devel] [PATCH 09/13] target/arm/arm-semi: Factor out implementation of SYS_SEEK, Peter Maydell, 2019/09/10
- [Qemu-devel] [PATCH 03/13] target/arm/arm-semi: Make semihosting code hand out its own file descriptors, Peter Maydell, 2019/09/10
- [Qemu-devel] [PATCH 12/13] target/arm/arm-semi: Implement SH_EXT_STDOUT_STDERR extension, Peter Maydell, 2019/09/10
- [Qemu-devel] [PATCH 13/13] target/arm/arm-semi: Implement SH_EXT_EXIT_EXTENDED extension, Peter Maydell, 2019/09/10
- Re: [Qemu-devel] [Qemu-arm] [PATCH 13/13] target/arm/arm-semi: Implement SH_EXT_EXIT_EXTENDED extension,
Alex Bennée <=
- [Qemu-devel] [PATCH 10/13] target/arm/arm-semi: Factor out implementation of SYS_FLEN, Peter Maydell, 2019/09/10
- [Qemu-devel] [PATCH 11/13] target/arm/arm-semi: Implement support for semihosting feature detection, Peter Maydell, 2019/09/10