diff options
| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-07-16 19:36:57 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-08-20 10:12:28 +1000 |
| commit | c5a8c0c99f67ae8a784faafbaaea1529825796e2 (patch) | |
| tree | 731b07d0ac0414dbeac5ce940fe59a04a8d63c3f /arch/powerpc/include/asm/reg.h | |
| parent | ee43eb788b3a06425fffb912677e2e1c8b00dd3b (diff) | |
powerpc: Remove use of a second scratch SPRG in STAB code
The STAB code used on Power3 and RS/64 uses a second scratch SPRG to
save a GPR in order to decide whether to go to do_stab_bolted_* or
to handle a normal data access exception.
This prevents our scheme of freeing SPRG3 which is user visible for
user uses since we cannot use SPRG0 which, on RS/64, seems to be
read-only for supervisor mode (like POWER4).
This reworks the STAB exception entry to use the PACA as temporary
storage instead.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/reg.h')
| -rw-r--r-- | arch/powerpc/include/asm/reg.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index a8179cc99ac..d17af2b3d4c 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -654,7 +654,7 @@ * 64-bit server: * - SPRG0 unused (reserved for HV on Power4) * - SPRG1 scratch for exception vectors - * - SPRG2 scratch for exception vectors + * - SPRG2 unused * * All 32-bit: * - SPRG3 current thread_info pointer @@ -707,7 +707,6 @@ #ifdef CONFIG_PPC_BOOK3S_64 #define SPRN_SPRG_SCRATCH0 SPRN_SPRG1 -#define SPRN_SPRG_SCRATCH1 SPRN_SPRG2 #endif #ifdef CONFIG_PPC_BOOK3S_32 |