michaelh/zephyr
1
0
Fork 0
Code Releases Activity

arch: arm: userspace: fix the incorrect ssf under bad syscall

Browse source 
The parameter ssf of the handler_bad_syscall got null pointer
due to that the R1 does not push into the stack in a right
order on cortex-M0. Adjust the pushing order of stack to make
the ssf being passed correctly.

Fixes #50146.

Signed-off-by: Enjia Mai <enjia.mai@intel.com>
This commit is contained in:
Enjia Mai 2022-09-17 22:07:10 +08:00 • committed by Carles Cufí
commit d9206aa29b
1 changed files with 1 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

2
arch/arm/core/aarch32/userspace.S
View file

@ -410,9 +410,9 @@ SECTION_FUNC(TEXT, z_arm_do_syscall)
/* BAD SYSCALL path */
/* fixup stack frame on the privileged stack, adding ssf */
mov r1, sp
push {r4,r5}
/* ssf is present in r1 (sp) */
push {r1,lr}
push {r4,r5}
/* restore r0, r1 */
mov r0, ip
mov r1, lr