Revision history [back]
 | 1 | initial version | posted 2017-07-03 11:50:48 +0200  |
need to save/restore arm register(r11) when it is corrupted in kernel-arch-arm
In cpu_v7_do_suspend routine, r11 is used while it is NOT saved/restored, different compiler may have different usage of ARM general registers, so it may cause issues during calling cpu_v7_do_suspend.
We meet kernel fault occurs when using GCC 4.8.3, r11 contains valid value before calling into cpu_v7_do_suspend, but when returned from this routine, r11 is corrupted and lead to kernel fault. Doing save/restore for those corrupted registers is a must in assemble code.
Patch for kernel 3.4 is available
File affected: kernel-adaptation-sbj-3.4.108.20161101.1/arch/arm/mm/proc-v7.S lines 97-103; 108-114
| | 2 | No.2 Revision |
need to save/restore arm register(r11) when it is corrupted in kernel-arch-arm
In cpu_v7_do_suspend routine, r11 is used while it is NOT saved/restored, different compiler may have different usage of ARM general registers, so it may cause issues during calling cpu_v7_do_suspend.
We meet kernel fault occurs when using GCC 4.8.3, r11 contains valid value before calling into cpu_v7_do_suspend, but when returned from this routine, r11 is corrupted and lead to kernel fault. Doing save/restore for those corrupted registers is a must in assemble code.
Patch for kernel 3.4 is availableavailable.
File affected: kernel-adaptation-sbj-3.4.108.20161101.1/arch/arm/mm/proc-v7.S lines 97-103; 108-114
| | 3 | No.3 Revision |
need to save/restore arm register(r11) when it is corrupted in kernel-arch-arm
In cpu_v7_do_suspend routine, r11 is used while it is NOT saved/restored, different compiler may have different usage of ARM general registers, so it may cause issues during calling cpu_v7_do_suspend.
We meet kernel fault occurs when using GCC 4.8.3, r11 contains valid value before calling into cpu_v7_do_suspend, but when returned from this routine, r11 is corrupted and lead to kernel fault. Doing save/restore for those corrupted registers is a must in assemble code.
Patch for kernel 3.4 is available.available
File affected: kernel-adaptation-sbj-3.4.108.20161101.1/arch/arm/mm/proc-v7.S lines 97-103; 108-114
| | 4 | No.4 Revision |
need to save/restore arm register(r11) when it is corrupted in kernel-arch-arm
In cpu_v7_do_suspend routine, r11 is used while it is NOT saved/restored, different compiler may have different usage of ARM general registers, so it may cause issues during calling cpu_v7_do_suspend.
We meet kernel fault occurs when using GCC 4.8.3, r11 contains valid value before calling into cpu_v7_do_suspend, but when returned from this routine, r11 is corrupted and lead to kernel fault. Doing save/restore for those corrupted registers is a must in assemble code.
Patch for kernel 3.4 is available
File affected: kernel-adaptation-sbj-3.4.108.20161101.1/arch/arm/mm/proc-v7.S lines 97-103; 108-114