| #include "autoconf.h" |
| #include "asm/asmdefs.h" |
| #include "asm/processor.h" |
| |
| |
| #ifdef CONFIG_PPC_64BITSUPPORT |
| #ifdef __powerpc64__ |
| #define ULONG_SIZE 8 |
| #define STACKFRAME_MINSIZE 48 |
| #define STKOFF STACKFRAME_MINSIZE |
| #define SAVE_SPACE 320 |
| #else |
| #define ULONG_SIZE 4 |
| #define STACKFRAME_MINSIZE 16 |
| #define STKOFF 8 |
| #define SAVE_SPACE 144 |
| #endif |
| #endif |
| |
| /* |
| * Switch execution context |
| * This saves registers in the stack, then |
| * switches the stack, and restores everything from the new stack. |
| * This function takes no argument. New stack pointer is |
| * taken from global variable __context, and old stack pointer |
| * is also saved to __context. This way we can just jump to |
| * this routine to get back to the original context. |
| */ |
| |
| _GLOBAL(__switch_context): |
| /* save internal stack pointer */ |
| #ifdef CONFIG_PPC64 |
| PPC_STL r1, -(SAVE_SPACE + 16) + STKOFF(r1) |
| #else |
| PPC_STL r1, -SAVE_SPACE + STKOFF(r1) |
| #endif |
| |
| #ifdef CONFIG_PPC64 |
| PPC_STLU r1, -(SAVE_SPACE + 16)(r1) |
| #else |
| PPC_STLU r1, -SAVE_SPACE(r1) /* fits within alignment */ |
| #endif |
| |
| /* r4, r5 */ |
| PPC_STL r4, (STKOFF + 9 * ULONG_SIZE)(r1) |
| PPC_STL r5, (STKOFF + 10 * ULONG_SIZE)(r1) |
| |
| /* link register */ |
| mflr r4 |
| PPC_STL r4, PPC_LR_STKOFF(r1) |
| PPC_STL r4, (STKOFF + ULONG_SIZE)(r1) |
| |
| PPC_STL r3, (STKOFF + 5 * ULONG_SIZE)(r1) |
| PPC_STL r2, (STKOFF + 4 * ULONG_SIZE)(r1) |
| PPC_STL r0, (STKOFF + 3 * ULONG_SIZE)(r1) |
| |
| /* ctr, cr and xer */ |
| mfctr r4 |
| PPC_STL r4, (STKOFF + 6 * ULONG_SIZE)(r1) |
| mfcr r4 |
| PPC_STL r4, (STKOFF + 7 * ULONG_SIZE)(r1) |
| mfxer r4 |
| PPC_STL r4, (STKOFF + 8 * ULONG_SIZE)(r1) |
| |
| /* r6-r31 */ |
| PPC_STL r6, (STKOFF + 11 * ULONG_SIZE)(r1) |
| PPC_STL r7, (STKOFF + 12 * ULONG_SIZE)(r1) |
| PPC_STL r8, (STKOFF + 13 * ULONG_SIZE)(r1) |
| PPC_STL r9, (STKOFF + 14 * ULONG_SIZE)(r1) |
| PPC_STL r10, (STKOFF + 15 * ULONG_SIZE)(r1) |
| PPC_STL r11, (STKOFF + 16 * ULONG_SIZE)(r1) |
| PPC_STL r12, (STKOFF + 17 * ULONG_SIZE)(r1) |
| PPC_STL r13, (STKOFF + 18 * ULONG_SIZE)(r1) |
| PPC_STL r14, (STKOFF + 19 * ULONG_SIZE)(r1) |
| PPC_STL r15, (STKOFF + 20 * ULONG_SIZE)(r1) |
| PPC_STL r16, (STKOFF + 21 * ULONG_SIZE)(r1) |
| PPC_STL r17, (STKOFF + 22 * ULONG_SIZE)(r1) |
| PPC_STL r18, (STKOFF + 23 * ULONG_SIZE)(r1) |
| PPC_STL r19, (STKOFF + 24 * ULONG_SIZE)(r1) |
| PPC_STL r20, (STKOFF + 25 * ULONG_SIZE)(r1) |
| PPC_STL r21, (STKOFF + 26 * ULONG_SIZE)(r1) |
| PPC_STL r22, (STKOFF + 27 * ULONG_SIZE)(r1) |
| PPC_STL r23, (STKOFF + 28 * ULONG_SIZE)(r1) |
| PPC_STL r24, (STKOFF + 29 * ULONG_SIZE)(r1) |
| PPC_STL r25, (STKOFF + 30 * ULONG_SIZE)(r1) |
| PPC_STL r26, (STKOFF + 31 * ULONG_SIZE)(r1) |
| PPC_STL r27, (STKOFF + 32 * ULONG_SIZE)(r1) |
| PPC_STL r28, (STKOFF + 33 * ULONG_SIZE)(r1) |
| PPC_STL r29, (STKOFF + 34 * ULONG_SIZE)(r1) |
| PPC_STL r30, (STKOFF + 35 * ULONG_SIZE)(r1) |
| PPC_STL r31, (STKOFF + 36 * ULONG_SIZE)(r1) |
| |
| /* swap context */ |
| LOAD_REG_IMMEDIATE(r4, __context) |
| PPC_LL r5, 0(r4) |
| PPC_STL r1, 0(r4) |
| mr r4, r5 |
| |
| b __set_context |
| |
| _GLOBAL(__switch_context_nosave): |
| LOAD_REG_IMMEDIATE(r4, __context) |
| PPC_LL r4, 0(r4) |
| |
| __set_context: |
| /* link register */ |
| PPC_LL r5, (STKOFF + ULONG_SIZE)(r4) |
| mtlr r5 |
| |
| PPC_LL r3, (STKOFF + 5 * ULONG_SIZE)(r4) |
| PPC_LL r2, (STKOFF + 4 * ULONG_SIZE)(r4) |
| PPC_LL r0, (STKOFF + 3 * ULONG_SIZE)(r4) |
| |
| /* ctr, cr and xer */ |
| PPC_LL r5, (STKOFF + 6 * ULONG_SIZE)(r4) |
| mtctr r5 |
| PPC_LL r5, (STKOFF + 7 * ULONG_SIZE)(r4) |
| mtcr r5 |
| PPC_LL r5, (STKOFF + 8 * ULONG_SIZE)(r4) |
| mtxer r5 |
| |
| /* r5-r31 */ |
| PPC_LL r5, (STKOFF + 10 * ULONG_SIZE)(r4) |
| PPC_LL r6, (STKOFF + 11 * ULONG_SIZE)(r4) |
| PPC_LL r7, (STKOFF + 12 * ULONG_SIZE)(r4) |
| PPC_LL r8, (STKOFF + 13 * ULONG_SIZE)(r4) |
| PPC_LL r9, (STKOFF + 14 * ULONG_SIZE)(r4) |
| PPC_LL r10, (STKOFF + 15 * ULONG_SIZE)(r4) |
| PPC_LL r11, (STKOFF + 16 * ULONG_SIZE)(r4) |
| PPC_LL r12, (STKOFF + 17 * ULONG_SIZE)(r4) |
| PPC_LL r13, (STKOFF + 18 * ULONG_SIZE)(r4) |
| PPC_LL r14, (STKOFF + 19 * ULONG_SIZE)(r4) |
| PPC_LL r15, (STKOFF + 20 * ULONG_SIZE)(r4) |
| PPC_LL r16, (STKOFF + 21 * ULONG_SIZE)(r4) |
| PPC_LL r17, (STKOFF + 22 * ULONG_SIZE)(r4) |
| PPC_LL r18, (STKOFF + 23 * ULONG_SIZE)(r4) |
| PPC_LL r19, (STKOFF + 24 * ULONG_SIZE)(r4) |
| PPC_LL r20, (STKOFF + 25 * ULONG_SIZE)(r4) |
| PPC_LL r21, (STKOFF + 26 * ULONG_SIZE)(r4) |
| PPC_LL r22, (STKOFF + 27 * ULONG_SIZE)(r4) |
| PPC_LL r23, (STKOFF + 28 * ULONG_SIZE)(r4) |
| PPC_LL r24, (STKOFF + 29 * ULONG_SIZE)(r4) |
| PPC_LL r25, (STKOFF + 30 * ULONG_SIZE)(r4) |
| PPC_LL r26, (STKOFF + 31 * ULONG_SIZE)(r4) |
| PPC_LL r27, (STKOFF + 32 * ULONG_SIZE)(r4) |
| PPC_LL r28, (STKOFF + 33 * ULONG_SIZE)(r4) |
| PPC_LL r29, (STKOFF + 34 * ULONG_SIZE)(r4) |
| PPC_LL r30, (STKOFF + 35 * ULONG_SIZE)(r4) |
| PPC_LL r31, (STKOFF + 36 * ULONG_SIZE)(r4) |
| |
| /* r4, r1 */ |
| PPC_LL r1, STKOFF(r4) |
| PPC_LL r4, (STKOFF + 9 * ULONG_SIZE)(r4) |
| |
| LOAD_REG_IMMEDIATE(r0, MSR_FP | MSR_ME | MSR_DR | MSR_IR) |
| MTMSRD(r0) |
| |
| blrl |
| |
| #ifdef CONFIG_PPC64 |
| /* Restore SF bit */ |
| LOAD_REG_IMMEDIATE(r0, MSR_SF | MSR_FP | MSR_ME | MSR_DR | MSR_IR) |
| MTMSRD(r0) |
| #endif |
| |
| _GLOBAL(__exit_context): |
| /* Get back to the original context */ |
| b __switch_context |
