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powerpc: Add current_stack_pointer as a register global

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current_stack_frame() doesn't return the stack pointer, but the
caller's stack frame. See commit bfe9a2cfe9 ("powerpc: Reimplement
__get_SP() as a function not a define") and commit
acf620ecf5 ("powerpc: Rename __get_SP() to current_stack_pointer()")
for details.

In some cases this is overkill or incorrect, as it doesn't return the
current value of r1.

So add a current_stack_pointer register global to get the value of r1
directly.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: Split out of other patch, tweak change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200220115141.2707-2-mpe@ellerman.id.au
This commit is contained in:
Christophe Leroy
2020-02-20 22:51:38 +11:00
committed by Michael Ellerman
parent 3d13e839e8
commit 0e63f01517
1 changed files with 2 additions and 0 deletions
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2
arch/powerpc/include/asm/reg.h
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@@ -1450,6 +1450,8 @@ static inline void mtsrin(u32 val, u32 idx)
extern unsigned long current_stack_frame(void);
register unsigned long current_stack_pointer asm("r1");
extern unsigned long scom970_read(unsigned int address);
extern void scom970_write(unsigned int address, unsigned long value);