[PATCH v7 7/9] ARM: add vdso user-space code
From: Nathan Lynch <hidden>
Date: 2014-07-01 13:34:11
On 07/01/2014 04:00 AM, Will Deacon wrote:
On Mon, Jun 30, 2014 at 10:29:28PM +0100, Andy Lutomirski wrote:quoted
On 06/22/2014 08:11 PM, Nathan Lynch wrote:quoted
diff --git a/arch/arm/kernel/vdso/datapage.S b/arch/arm/kernel/vdso/datapage.S new file mode 100644 index 000000000000..fbf36d75da06 --- /dev/null +++ b/arch/arm/kernel/vdso/datapage.S@@ -0,0 +1,15 @@ +#include <linux/linkage.h> +#include <asm/asm-offsets.h> + + .align 2 +.L_vdso_data_ptr: + .long _start - . - VDSO_DATA_SIZE + +ENTRY(__get_datapage) + .cfi_startproc + adr r0, .L_vdso_data_ptr + ldr r1, [r0] + add r0, r0, r1 + bx lr + .cfi_endproc +ENDPROC(__get_datapage)Can you translate this into English for the non-ARM-speakers here?Also, I'm not sure .cfi directives are the right things to use for AArch32. ARM has special .fnstart, .fnend, .movsp diretives for its own unwind format. Maybe GDB works with both -- have you tried unwinding out of this with anything?
Not since it stopped crashing, which was months ago :-) I think it worked with GDB 7.5 at least. I'll revisit this.