Commit a40f91c8 authored by Will Deacon's avatar Will Deacon Committed by Luis Henriques

Revert "ARM64: unwind: Fix PC calculation"

commit 9702970c upstream.

This reverts commit e306dfd0.

With this patch applied, we were the only architecture making this sort
of adjustment to the PC calculation in the unwinder. This causes
problems for ftrace, where the PC values are matched against the
contents of the stack frames in the callchain and fail to match any
records after the address adjustment.

Whilst there has been some effort to change ftrace to workaround this,
those patches are not yet ready for mainline and, since we're the odd
architecture in this regard, let's just step in line with other
architectures (like arch/arm/) for now.
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 9b7f7de4
......@@ -48,11 +48,7 @@ int notrace unwind_frame(struct stackframe *frame)
frame->sp = fp + 0x10;
frame->fp = *(unsigned long *)(fp);
/*
* -4 here because we care about the PC at time of bl,
* not where the return will go.
*/
frame->pc = *(unsigned long *)(fp + 8) - 4;
frame->pc = *(unsigned long *)(fp + 8);
return 0;
}
......
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