mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-22 06:57:57 +00:00
f791fb4af4
Signed-off-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: Tim Harvey <tharvey@gateworks.com> [fixes]
43 lines
1.2 KiB
Diff
43 lines
1.2 KiB
Diff
From: Matt Redfearn <matt.redfearn@imgtec.com>
|
|
Date: Mon, 19 Dec 2016 14:20:57 +0000
|
|
Subject: [PATCH] MIPS: Stack unwinding while on IRQ stack
|
|
|
|
Within unwind stack, check if the stack pointer being unwound is within
|
|
the CPU's irq_stack and if so use that page rather than the task's stack
|
|
page.
|
|
|
|
Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
|
|
---
|
|
|
|
--- a/arch/mips/kernel/process.c
|
|
+++ b/arch/mips/kernel/process.c
|
|
@@ -33,6 +33,7 @@
|
|
#include <asm/dsemul.h>
|
|
#include <asm/dsp.h>
|
|
#include <asm/fpu.h>
|
|
+#include <asm/irq.h>
|
|
#include <asm/msa.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/mipsregs.h>
|
|
@@ -511,7 +512,19 @@ EXPORT_SYMBOL(unwind_stack_by_address);
|
|
unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
|
|
unsigned long pc, unsigned long *ra)
|
|
{
|
|
- unsigned long stack_page = (unsigned long)task_stack_page(task);
|
|
+ unsigned long stack_page = 0;
|
|
+ int cpu;
|
|
+
|
|
+ for_each_possible_cpu(cpu) {
|
|
+ if (on_irq_stack(cpu, *sp)) {
|
|
+ stack_page = (unsigned long)irq_stack[cpu];
|
|
+ break;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ if (!stack_page)
|
|
+ stack_page = (unsigned long)task_stack_page(task);
|
|
+
|
|
return unwind_stack_by_address(stack_page, sp, pc, ra);
|
|
}
|
|
#endif
|