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i386: take pcb and fpu area into account in GET_STACK_USAGE

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On this platform, the pcb and FPU save area are allocated from the top
of each kernel stack, so they should be excluded from the calculation of
the total and used stack sizes.

Reviewed by:	kib
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D32581
This commit is contained in:
Mitchell Horne 2021-11-25 11:54:33 -04:00
parent b394e16ef0
commit 8bc792b384
1 changed files with 4 additions and 4 deletions
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8
sys/i386/include/proc.h
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@ -71,13 +71,13 @@ struct syscall_args {
#ifdef _KERNEL
#include <machine/md_var.h>
/* Get the current kernel thread stack usage. */
#define GET_STACK_USAGE(total, used) do { \
struct thread *td = curthread; \
(total) = td->td_kstack_pages * PAGE_SIZE; \
(used) = (char *)td->td_kstack + \
td->td_kstack_pages * PAGE_SIZE - \
(char *)&td; \
(total) = (vm_offset_t)get_pcb_td(td) - td->td_kstack; \
(used) = (vm_offset_t)get_pcb_td(td) - (vm_offset_t)&td; \
} while (0)
void set_user_ldt(struct mdproc *);