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arch: arm: push ssf to thread privileged stack to complete stack frame

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Pushes the seventh argument named ssf to thread's privileged
stack to follow below syscall prototype.

uintptr_t z_mrsh_xx(uintptr_t arg0, uintptr_t arg1, uintptr_t arg2,
		    uintptr_t arg3, uintptr_t arg4, void *more, void *ssf)

Fixes: #29386.

Signed-off-by: Wentong Wu <wentong.wu@intel.com>
This commit is contained in:
Wentong Wu 2020-10-28 06:08:02 -04:00 • committed by Anas Nashif
commit bfc7785da0
1 changed files with 9 additions and 6 deletions
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15
arch/arm/core/aarch32/userspace.S
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@ -374,6 +374,9 @@ SECTION_FUNC(TEXT, z_arm_do_syscall)
mov r1, lr
b dispatch_syscall
valid_syscall:
/* push ssf to privileged stack */
mov r1, sp
push {r1}
/* push args to complete stack frame */
push {r4,r5}
@ -396,8 +399,7 @@ dispatch_syscall:
*/
mov ip, r0
mov r0, sp
adds r0, #12
ldr r0, [r0]
ldr r0, [r0,#16]
mov lr, r0
/* Restore r0 */
mov r0, ip
@ -415,7 +417,8 @@ dispatch_syscall:
valid_syscall:
/* push args to complete stack frame */
push {r4,r5}
mov ip, sp
push {r4,r5,ip}
dispatch_syscall:
ldr ip, =_k_syscall_table
@ -426,7 +429,7 @@ dispatch_syscall:
blx ip
/* restore LR */
ldr lr, [sp,#12]
ldr lr, [sp,#16]
#endif
@ -467,14 +470,14 @@ dispatch_syscall:
/* set stack back to unprivileged stack */
mov ip, r0
mov r0, sp
ldr r0, [r0,#8]
ldr r0, [r0,#12]
msr PSP, r0
/* Restore r0 */
mov r0, ip
#elif defined(CONFIG_ARMV7_M_ARMV8_M_MAINLINE)
/* set stack back to unprivileged stack */
ldr ip, [sp,#8]
ldr ip, [sp,#12]
msr PSP, ip
#endif