Commit 14e96578 authored by Vineet Gupta's avatar Vineet Gupta Committed by Greg Kroah-Hartman

ARC: Fix KSTK_ESP()

commit 13648b01 upstream.

/proc/<pid>/maps currently don't annotate stack vma with "[stack]"
This is because KSTK_ESP ie expected to return usermode SP of tsk while
currently it returns the kernel mode SP of a sleeping tsk.

While the fix is trivial, we also need to adjust the ARC kernel stack
unwinder to not use KSTK_SP and friends any more.
Reported-and-suggested-by: default avatarAlexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7fed3a79
......@@ -75,18 +75,19 @@ unsigned long thread_saved_pc(struct task_struct *t);
#define release_segments(mm) do { } while (0)
#define KSTK_EIP(tsk) (task_pt_regs(tsk)->ret)
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
/*
* Where abouts of Task's sp, fp, blink when it was last seen in kernel mode.
* Look in process.c for details of kernel stack layout
*/
#define KSTK_ESP(tsk) (tsk->thread.ksp)
#define TSK_K_ESP(tsk) (tsk->thread.ksp)
#define KSTK_REG(tsk, off) (*((unsigned int *)(KSTK_ESP(tsk) + \
#define TSK_K_REG(tsk, off) (*((unsigned int *)(TSK_K_ESP(tsk) + \
sizeof(struct callee_regs) + off)))
#define KSTK_BLINK(tsk) KSTK_REG(tsk, 4)
#define KSTK_FP(tsk) KSTK_REG(tsk, 0)
#define TSK_K_BLINK(tsk) TSK_K_REG(tsk, 4)
#define TSK_K_FP(tsk) TSK_K_REG(tsk, 0)
extern void start_thread(struct pt_regs * regs, unsigned long pc,
unsigned long usp);
......
......@@ -64,9 +64,9 @@ static void seed_unwind_frame_info(struct task_struct *tsk,
frame_info->task = tsk;
frame_info->regs.r27 = KSTK_FP(tsk);
frame_info->regs.r28 = KSTK_ESP(tsk);
frame_info->regs.r31 = KSTK_BLINK(tsk);
frame_info->regs.r27 = TSK_K_FP(tsk);
frame_info->regs.r28 = TSK_K_ESP(tsk);
frame_info->regs.r31 = TSK_K_BLINK(tsk);
frame_info->regs.r63 = (unsigned int)__switch_to;
/* In the prologue of __switch_to, first FP is saved on stack
......
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