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x86: implements arch_thread_priv_stack_space_get

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This implements arch_thread_priv_stack_space_get() so this can
be used to figure out how much privileged stack space is used.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This commit is contained in:
Daniel Leung 2024-07-30 12:30:32 -07:00 committed by Anas Nashif
parent fb0babacee
commit d736af8d26
2 changed files with 19 additions and 0 deletions
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1
arch/Kconfig
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@ -95,6 +95,7 @@ config X86
&& !SOC_HAS_TIMING_FUNCTIONS
select ARCH_HAS_STACK_CANARIES_TLS
select ARCH_SUPPORTS_MEM_MAPPED_STACKS if X86_MMU && !DEMAND_PAGING
select ARCH_HAS_THREAD_PRIV_STACK_SPACE_GET if USERSPACE
help
x86 architecture

18
arch/x86/core/userspace.c
View file

@ -4,6 +4,8 @@
* SPDX-License-Identifier: Apache-2.0
*/
#include <errno.h>
#include <zephyr/kernel.h>
#include <zephyr/sys/speculation.h>
#include <zephyr/internal/syscall_handler.h>
@ -183,3 +185,19 @@ FUNC_NORETURN void arch_user_mode_enter(k_thread_entry_t user_entry,
_current->stack_info.start);
CODE_UNREACHABLE;
}
int arch_thread_priv_stack_space_get(const struct k_thread *thread, size_t *stack_size,
size_t *unused_ptr)
{
struct z_x86_thread_stack_header *hdr_stack_obj;
if ((thread->base.user_options & K_USER) != K_USER) {
return -EINVAL;
}
hdr_stack_obj = (struct z_x86_thread_stack_header *)thread->stack_obj;
return z_stack_space_get(&hdr_stack_obj->privilege_stack[0],
sizeof(hdr_stack_obj->privilege_stack),
unused_ptr);
}