diff options
Diffstat (limited to 'arch/powerpc/include/asm/epapr_hcalls.h')
| -rw-r--r-- | arch/powerpc/include/asm/epapr_hcalls.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/epapr_hcalls.h b/arch/powerpc/include/asm/epapr_hcalls.h index f3b0c2cc9fea..976835d8f22e 100644 --- a/arch/powerpc/include/asm/epapr_hcalls.h +++ b/arch/powerpc/include/asm/epapr_hcalls.h | |||
| @@ -134,10 +134,15 @@ | |||
| 134 | * whether they will be clobbered. | 134 | * whether they will be clobbered. |
| 135 | * | 135 | * |
| 136 | * Note that r11 can be used as an output parameter. | 136 | * Note that r11 can be used as an output parameter. |
| 137 | * | ||
| 138 | * The "memory" clobber is only necessary for hcalls where the Hypervisor | ||
| 139 | * will read or write guest memory. However, we add it to all hcalls because | ||
| 140 | * the impact is minimal, and we want to ensure that it's present for the | ||
| 141 | * hcalls that need it. | ||
| 137 | */ | 142 | */ |
| 138 | 143 | ||
| 139 | /* List of common clobbered registers. Do not use this macro. */ | 144 | /* List of common clobbered registers. Do not use this macro. */ |
| 140 | #define EV_HCALL_CLOBBERS "r0", "r12", "xer", "ctr", "lr", "cc" | 145 | #define EV_HCALL_CLOBBERS "r0", "r12", "xer", "ctr", "lr", "cc", "memory" |
| 141 | 146 | ||
| 142 | #define EV_HCALL_CLOBBERS8 EV_HCALL_CLOBBERS | 147 | #define EV_HCALL_CLOBBERS8 EV_HCALL_CLOBBERS |
| 143 | #define EV_HCALL_CLOBBERS7 EV_HCALL_CLOBBERS8, "r10" | 148 | #define EV_HCALL_CLOBBERS7 EV_HCALL_CLOBBERS8, "r10" |