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1275 |
phoenix |
/*
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* arch/ppc64/kernel/entry.S
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*
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* PowerPC version
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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* Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
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* Copyright (C) 1996 Cort Dougan
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* Adapted for Power Macintosh by Paul Mackerras.
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* Low-level exception handlers and MMU support
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* rewritten by Paul Mackerras.
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* Copyright (C) 1996 Paul Mackerras.
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* MPC8xx modifications Copyright (C) 1997 Dan Malek (dmalek@jlc.net).
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*
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* This file contains the system call entry code, context switch
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* code, and exception/interrupt return code for PowerPC.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include "ppc_asm.h"
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#include
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#include
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#include
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#include
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#include
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#include
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#include
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#ifdef CONFIG_PPC_ISERIES
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#define DO_SOFT_DISABLE
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#endif
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#undef SHOW_SYSCALLS
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#undef SHOW_SYSCALLS_TASK
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#ifdef SHOW_SYSCALLS_TASK
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.data
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show_syscalls_task:
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.long -1
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#endif
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/*
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* Handle a system call.
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*/
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.text
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_GLOBAL(DoSyscall)
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ld r11,_CCR(r1) /* Clear SO bit in CR */
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lis r10,0x1000
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andc r11,r11,r10
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std r11,_CCR(r1)
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ld r10,PACACURRENT(r13)
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std r0,THREAD+LAST_SYSCALL(r10)
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#ifdef SHOW_SYSCALLS
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# ifdef SHOW_SYSCALLS_TASK
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LOADBASE(r31,show_syscalls_task)
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ld r31,show_syscalls_task@l(r31)
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cmp 0,r10,r31
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bne 1f
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# endif /* SHOW_SYSCALLS_TASK */
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LOADADDR(r3,7f)
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ld r4,GPR0(r1)
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ld r5,GPR3(r1)
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ld r6,GPR4(r1)
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ld r7,GPR5(r1)
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ld r8,GPR6(r1)
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ld r9,GPR7(r1)
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bl .printk
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LOADADDR(r3,77f)
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ld r4,GPR8(r1)
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ld r5,GPR9(r1)
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ld r6, PACACURRENT(r13)
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bl .printk
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ld r0,GPR0(r1)
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ld r3,GPR3(r1)
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ld r4,GPR4(r1)
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ld r5,GPR5(r1)
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ld r6,GPR6(r1)
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ld r7,GPR7(r1)
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ld r8,GPR8(r1)
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1:
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#endif /* SHOW_SYSCALLS */
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ld r11,TASK_PTRACE(r10)
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andi. r11,r11,PT_TRACESYS
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bne- 50f
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cmpli 0,r0,NR_syscalls
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bge- 66f
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/* Ken Aaker: Need to vector to 32 Bit or default sys_call_table here,
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* based on caller's run-mode / personality.
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*
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*/
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#ifdef CONFIG_BINFMT_ELF32
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ld r11,THREAD+THREAD_FLAGS(r10)
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andi. r11,r11,PPC_FLAG_32BIT
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beq- 15f
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LOADADDR(r11,.sys_call_table32)
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/* Now mung the first 4 parameters into shape, by making certain that
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* the high bits (most significant 32 bits in 64 bit reg) are 0
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* for the first 4 parameter regs(3-6).
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*/
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clrldi r3,r3,32
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clrldi r4,r4,32
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clrldi r5,r5,32
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clrldi r6,r6,32
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b 17f
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15:
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#endif
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LOADADDR(r11,.sys_call_table)
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17:
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slwi r0,r0,3
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ldx r10,r11,r0 /* Fetch system call handler [ptr] */
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mtlr r10
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addi r9,r1,STACK_FRAME_OVERHEAD
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blrl /* Call handler */
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_GLOBAL(ret_from_syscall_1)
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20: std r3,RESULT(r1) /* Save result */
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#ifdef SHOW_SYSCALLS
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# ifdef SHOW_SYSCALLS_TASK
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cmp 0,r13,r31
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bne 91f
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# endif /* SHOW_SYSCALLS_TASK */
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mr r4,r3
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LOADADDR(r3,79f)
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bl .printk
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ld r3,RESULT(r1)
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91:
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#endif /* SHOW_SYSCALLS */
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li r10,-_LAST_ERRNO
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cmpl 0,r3,r10
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blt 30f
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neg r3,r3
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cmpi 0,r3,ERESTARTNOHAND
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bne 22f
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li r3,EINTR
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22: ld r10,_CCR(r1) /* Set SO bit in CR */
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oris r10,r10,0x1000
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std r10,_CCR(r1)
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30: std r3,GPR3(r1) /* Update return value */
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b .ret_from_except
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66: li r3,ENOSYS
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b 22b
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/* Traced system call support */
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50: bl .syscall_trace
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ld r0,GPR0(r1) /* Restore original registers */
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ld r3,GPR3(r1)
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ld r4,GPR4(r1)
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ld r5,GPR5(r1)
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ld r6,GPR6(r1)
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ld r7,GPR7(r1)
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ld r8,GPR8(r1)
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ld r9,GPR9(r1)
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cmpli 0,r0,NR_syscalls
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bge- 66f
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#ifdef CONFIG_BINFMT_ELF32
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ld r10,PACACURRENT(r13)
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ld r10,THREAD+THREAD_FLAGS(r10)
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andi. r10,r10,PPC_FLAG_32BIT
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beq- 55f
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LOADADDR(r10,.sys_call_table32)
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/* Now mung the first 4 parameters into shape, by making certain that
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* the high bits (most significant 32 bits in 64 bit reg) are 0
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* for the first 4 parameter regs(3-6).
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*/
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clrldi r3,r3,32
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clrldi r4,r4,32
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clrldi r5,r5,32
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clrldi r6,r6,32
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b 57f
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55:
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#endif
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LOADADDR(r10,.sys_call_table)
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57:
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slwi r0,r0,3
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ldx r10,r10,r0 /* Fetch system call handler [ptr] */
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mtlr r10
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addi r9,r1,STACK_FRAME_OVERHEAD
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blrl /* Call handler */
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_GLOBAL(ret_from_syscall_2)
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58: std r3,RESULT(r1) /* Save result */
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li r10,-_LAST_ERRNO
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cmpl 0,r3,r10
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blt 60f
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neg r3,r3
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cmpi 0,r3,ERESTARTNOHAND
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bne 57f
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li r3,EINTR
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57: ld r10,_CCR(r1) /* Set SO bit in CR */
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oris r10,r10,0x1000
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std r10,_CCR(r1)
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60: std r3,GPR3(r1) /* Update return value */
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bl .syscall_trace
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b .ret_from_except
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66: li r3,ENOSYS
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b 57b
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#ifdef SHOW_SYSCALLS
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7: .string "syscall %d(%x, %x, %x, %x, %x, "
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77: .string "%x, %x), current=%p\n"
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79: .string " -> %x\n"
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.align 2,0
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#endif
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| 204 |
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| 205 |
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_GLOBAL(ppc32_sigreturn)
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| 206 |
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bl .sys32_sigreturn
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| 207 |
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b 80f
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| 208 |
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| 209 |
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_GLOBAL(ppc32_rt_sigreturn)
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| 210 |
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bl .sys32_rt_sigreturn
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b 80f
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| 212 |
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| 213 |
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_GLOBAL(ppc64_sigreturn)
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| 214 |
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bl .sys_sigreturn
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| 215 |
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b 80f
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| 216 |
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| 217 |
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_GLOBAL(ppc64_rt_sigreturn)
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| 218 |
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bl .sys_rt_sigreturn
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| 219 |
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| 220 |
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80: ld r10,PACACURRENT(r13)
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| 221 |
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ld r10,TASK_PTRACE(r10)
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| 222 |
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andi. r10,r10,PT_TRACESYS
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| 223 |
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bne- 81f
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| 224 |
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cmpi 0,r3,0
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| 225 |
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bge .ret_from_except
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| 226 |
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b 20b
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| 227 |
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81: cmpi 0,r3,0
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| 228 |
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blt 58b
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| 229 |
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bl .syscall_trace
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| 230 |
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b .ret_from_except
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| 231 |
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| 232 |
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/*
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| 233 |
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* This routine switches between two different tasks. The process
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| 234 |
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* state of one is saved on its kernel stack. Then the state
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| 235 |
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* of the other is restored from its kernel stack. The memory
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| 236 |
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* management hardware is updated to the second process's state.
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| 237 |
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* Finally, we can return to the second process, via ret_from_except.
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| 238 |
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* On entry, r3 points to the THREAD for the current task, r4
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| 239 |
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* points to the THREAD for the new task.
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| 240 |
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*
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| 241 |
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* Note: there are two ways to get to the "going out" portion
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| 242 |
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* of this code; either by coming in via the entry (_switch)
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| 243 |
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* or via "fork" which must set up an environment equivalent
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| 244 |
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* to the "_switch" path. If you change this (or in particular, the
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| 245 |
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* SAVE_REGS macro), you'll have to change the fork code also.
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| 246 |
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*
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| 247 |
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* The code which creates the new task context is in 'copy_thread'
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| 248 |
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* in arch/ppc64/kernel/process.c
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| 249 |
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*/
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| 250 |
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_GLOBAL(_switch)
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| 251 |
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stdu r1,-INT_FRAME_SIZE(r1)
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| 252 |
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ld r6,0(r1)
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| 253 |
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std r6,GPR1(r1)
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| 254 |
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/* r3-r13 are caller saved -- Cort */
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| 255 |
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SAVE_GPR(2, r1)
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| 256 |
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SAVE_8GPRS(14, r1)
|
| 257 |
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SAVE_10GPRS(22, r1)
|
| 258 |
|
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mflr r20 /* Return to switch caller */
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| 259 |
|
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mfmsr r22
|
| 260 |
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li r6,MSR_FP /* Disable floating-point */
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| 261 |
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#ifdef CONFIG_ALTIVEC
|
| 262 |
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BEGIN_FTR_SECTION
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| 263 |
|
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oris r6,r6,MSR_VEC@h /* Disable altivec */
|
| 264 |
|
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END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
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| 265 |
|
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#endif /* CONFIG_ALTIVEC */
|
| 266 |
|
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andc r22,r22,r6
|
| 267 |
|
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mtmsrd r22
|
| 268 |
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isync
|
| 269 |
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std r20,_NIP(r1)
|
| 270 |
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std r22,_MSR(r1)
|
| 271 |
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std r20,_LINK(r1)
|
| 272 |
|
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mfcr r20
|
| 273 |
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std r20,_CCR(r1)
|
| 274 |
|
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li r6,0x0ff0
|
| 275 |
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std r6,TRAP(r1)
|
| 276 |
|
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std r1,KSP(r3) /* Set old stack pointer */
|
| 277 |
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|
| 278 |
|
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addi r3,r3,-THREAD /* old 'current' for return value */
|
| 279 |
|
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addi r7,r4,-THREAD /* Convert THREAD to 'current' */
|
| 280 |
|
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std r7,PACACURRENT(r13) /* Set new 'current' */
|
| 281 |
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|
| 282 |
|
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#ifdef CONFIG_PPC_ISERIES
|
| 283 |
|
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ld r7,THREAD_FLAGS(r4) /* Get run light flag */
|
| 284 |
|
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mfspr r9,CTRLF
|
| 285 |
|
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srdi r7,r7,1 /* Align to run light bit in CTRL reg */
|
| 286 |
|
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insrdi r9,r7,1,63 /* Insert run light into CTRL */
|
| 287 |
|
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mtspr CTRLT,r9
|
| 288 |
|
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#endif
|
| 289 |
|
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ld r1,KSP(r4) /* Load new stack pointer */
|
| 290 |
|
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ld r6,_CCR(r1)
|
| 291 |
|
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mtcrf 0xFF,r6
|
| 292 |
|
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/* r3-r13 are destroyed -- Cort */
|
| 293 |
|
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REST_8GPRS(14, r1)
|
| 294 |
|
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REST_10GPRS(22, r1)
|
| 295 |
|
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|
| 296 |
|
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ld r7,_NIP(r1) /* Return to _switch caller in new task */
|
| 297 |
|
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ld r1,GPR1(r1)
|
| 298 |
|
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mtlr r7
|
| 299 |
|
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blr
|
| 300 |
|
|
|
| 301 |
|
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_GLOBAL(ret_from_fork)
|
| 302 |
|
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bl .schedule_tail
|
| 303 |
|
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ld r4,PACACURRENT(r13)
|
| 304 |
|
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ld r0,TASK_PTRACE(r4)
|
| 305 |
|
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andi. r0,r0,PT_TRACESYS
|
| 306 |
|
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beq+ .ret_from_except
|
| 307 |
|
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bl .syscall_trace
|
| 308 |
|
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b .ret_from_except
|
| 309 |
|
|
|
| 310 |
|
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_GLOBAL(ret_from_except)
|
| 311 |
|
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#ifdef CONFIG_PPC_ISERIES
|
| 312 |
|
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ld r5,SOFTE(r1)
|
| 313 |
|
|
cmpdi 0,r5,0
|
| 314 |
|
|
beq 4f
|
| 315 |
|
|
irq_recheck:
|
| 316 |
|
|
/* Check for pending interrupts (iSeries) */
|
| 317 |
|
|
CHECKANYINT(r3,r4)
|
| 318 |
|
|
beq+ 4f /* skip do_IRQ if no interrupts */
|
| 319 |
|
|
|
| 320 |
|
|
li r3,0
|
| 321 |
|
|
stb r3,PACAPROCENABLED(r13) /* ensure we are disabled */
|
| 322 |
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
| 323 |
|
|
bl .do_IRQ
|
| 324 |
|
|
b irq_recheck /* loop back and handle more */
|
| 325 |
|
|
4:
|
| 326 |
|
|
#endif
|
| 327 |
|
|
_GLOBAL(do_bottom_half_ret)
|
| 328 |
|
|
ld r3,_MSR(r1) /* Returning to user mode? */
|
| 329 |
|
|
andi. r3,r3,MSR_PR
|
| 330 |
|
|
beq+ restore /* if so, check need_resched and signals */
|
| 331 |
|
|
_GLOBAL(ret_to_user_hook)
|
| 332 |
|
|
nop
|
| 333 |
|
|
/* NEED_RESCHED is a volatile long (64-bits) */
|
| 334 |
|
|
ld r3,PACACURRENT(r13)
|
| 335 |
|
|
ld r3,NEED_RESCHED(r3)
|
| 336 |
|
|
cmpi 0,r3,0 /* check need_resched flag */
|
| 337 |
|
|
beq+ 7f
|
| 338 |
|
|
bl .schedule
|
| 339 |
|
|
/* SIGPENDING is an int (32-bits) */
|
| 340 |
|
|
7:
|
| 341 |
|
|
ld r5,PACACURRENT(r13)
|
| 342 |
|
|
lwz r5,SIGPENDING(r5) /* Check for pending unblocked signals */
|
| 343 |
|
|
cmpwi 0,r5,0
|
| 344 |
|
|
beq+ restore
|
| 345 |
|
|
li r3,0
|
| 346 |
|
|
addi r4,r1,STACK_FRAME_OVERHEAD
|
| 347 |
|
|
bl .do_signal
|
| 348 |
|
|
_GLOBAL(do_signal_ret)
|
| 349 |
|
|
restore:
|
| 350 |
|
|
ld r3,_CTR(r1)
|
| 351 |
|
|
ld r0,_LINK(r1)
|
| 352 |
|
|
mtctr r3
|
| 353 |
|
|
mtlr r0
|
| 354 |
|
|
ld r3,_XER(r1)
|
| 355 |
|
|
mtspr XER,r3
|
| 356 |
|
|
|
| 357 |
|
|
REST_8GPRS(5, r1)
|
| 358 |
|
|
REST_10GPRS(14, r1)
|
| 359 |
|
|
REST_8GPRS(24, r1)
|
| 360 |
|
|
|
| 361 |
|
|
/* make sure we hard disable here, even if rtl is active, to protect
|
| 362 |
|
|
* SRR[01] and SPRG2 -- Cort
|
| 363 |
|
|
*/
|
| 364 |
|
|
mfmsr r0 /* Get current interrupt state */
|
| 365 |
|
|
li r4,0
|
| 366 |
|
|
ori r4,r4,MSR_EE|MSR_RI
|
| 367 |
|
|
andc r0,r0,r4 /* clear MSR_EE and MSR_RI */
|
| 368 |
|
|
mtmsrd r0 /* Update machine state */
|
| 369 |
|
|
#ifdef CONFIG_PPC_ISERIES
|
| 370 |
|
|
ld r0,SOFTE(r1)
|
| 371 |
|
|
cmpi 0,r0,0
|
| 372 |
|
|
beq+ 1f
|
| 373 |
|
|
|
| 374 |
|
|
CHECKANYINT(r4,r3)
|
| 375 |
|
|
beq+ 1f
|
| 376 |
|
|
mfmsr r0
|
| 377 |
|
|
ori r0,r0,MSR_EE|MSR_RI
|
| 378 |
|
|
mtmsrd r0
|
| 379 |
|
|
b irq_recheck
|
| 380 |
|
|
|
| 381 |
|
|
1:
|
| 382 |
|
|
#endif
|
| 383 |
|
|
stdcx. r0,0,r1 /* to clear the reservation */
|
| 384 |
|
|
|
| 385 |
|
|
#ifdef DO_SOFT_DISABLE
|
| 386 |
|
|
ld r0,SOFTE(r1)
|
| 387 |
|
|
stb r0,PACAPROCENABLED(r13)
|
| 388 |
|
|
#endif
|
| 389 |
|
|
/* if returning to user mode, save kernel SP */
|
| 390 |
|
|
ld r0,_MSR(r1)
|
| 391 |
|
|
andi. r0,r0,MSR_PR
|
| 392 |
|
|
beq+ 1f
|
| 393 |
|
|
ld r4,PACACURRENT(r13)
|
| 394 |
|
|
#ifdef CONFIG_ALTIVEC
|
| 395 |
|
|
BEGIN_FTR_SECTION
|
| 396 |
|
|
ld r0,THREAD+THREAD_VRSAVE(r4)
|
| 397 |
|
|
mtspr SPRN_VRSAVE,r0 /* if GPUL, restore VRSAVE reg */
|
| 398 |
|
|
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
|
| 399 |
|
|
#endif /* CONFIG_ALTIVEC */
|
| 400 |
|
|
addi r0,r1,INT_FRAME_SIZE /* size of frame */
|
| 401 |
|
|
std r0,THREAD+KSP(r4) /* save kernel stack pointer */
|
| 402 |
|
|
std r1,PACAKSAVE(r13) /* save exception stack pointer */
|
| 403 |
|
|
REST_GPR(13,r1)
|
| 404 |
|
|
1:
|
| 405 |
|
|
mfmsr r0
|
| 406 |
|
|
li r2, MSR_RI
|
| 407 |
|
|
andc r0,r0,r2
|
| 408 |
|
|
mtmsrd r0,1
|
| 409 |
|
|
|
| 410 |
|
|
ld r0,_MSR(r1)
|
| 411 |
|
|
mtspr SRR1,r0
|
| 412 |
|
|
ld r2,_CCR(r1)
|
| 413 |
|
|
mtcrf 0xFF,r2
|
| 414 |
|
|
ld r2,_NIP(r1)
|
| 415 |
|
|
mtspr SRR0,r2
|
| 416 |
|
|
ld r0,GPR0(r1)
|
| 417 |
|
|
ld r2,GPR2(r1)
|
| 418 |
|
|
ld r3,GPR3(r1)
|
| 419 |
|
|
ld r4,GPR4(r1)
|
| 420 |
|
|
ld r1,GPR1(r1)
|
| 421 |
|
|
|
| 422 |
|
|
rfid
|
| 423 |
|
|
|
| 424 |
|
|
/*
|
| 425 |
|
|
* On CHRP, the Run-Time Abstraction Services (RTAS) have to be
|
| 426 |
|
|
* called with the MMU off.
|
| 427 |
|
|
*
|
| 428 |
|
|
* In addition, we need to be in 32b mode, at least for now.
|
| 429 |
|
|
*
|
| 430 |
|
|
* Note: r3 is an input parameter to rtas, so don't trash it...
|
| 431 |
|
|
*/
|
| 432 |
|
|
_GLOBAL(enter_rtas)
|
| 433 |
|
|
mflr r0
|
| 434 |
|
|
std r0,16(r1)
|
| 435 |
|
|
stdu r1,-RTAS_FRAME_SIZE(r1) /* Save SP and create stack space. */
|
| 436 |
|
|
|
| 437 |
|
|
/* Because RTAS is running in 32b mode, it clobbers the high order half
|
| 438 |
|
|
* of all registers that it saves. We therefore save those registers
|
| 439 |
|
|
* RTAS might touch to the stack. (r0, r3-r13 are caller saved)
|
| 440 |
|
|
*/
|
| 441 |
|
|
SAVE_GPR(2, r1) /* Save the TOC */
|
| 442 |
|
|
SAVE_GPR(13, r1) /* Save current */
|
| 443 |
|
|
SAVE_8GPRS(14, r1) /* Save the non-volatiles */
|
| 444 |
|
|
SAVE_10GPRS(22, r1) /* ditto */
|
| 445 |
|
|
|
| 446 |
|
|
mfcr r4
|
| 447 |
|
|
std r4,_CCR(r1)
|
| 448 |
|
|
mfctr r5
|
| 449 |
|
|
std r5,_CTR(r1)
|
| 450 |
|
|
mfspr r6,XER
|
| 451 |
|
|
std r6,_XER(r1)
|
| 452 |
|
|
mfdar r7
|
| 453 |
|
|
std r7,_DAR(r1)
|
| 454 |
|
|
mfdsisr r8
|
| 455 |
|
|
std r8,_DSISR(r1)
|
| 456 |
|
|
mfsrr0 r9
|
| 457 |
|
|
std r9,_SRR0(r1)
|
| 458 |
|
|
mfsrr1 r10
|
| 459 |
|
|
std r10,_SRR1(r1)
|
| 460 |
|
|
|
| 461 |
|
|
/* Unfortunately, the stack pointer and the MSR are also clobbered,
|
| 462 |
|
|
* so they are saved in the PACA (SPRG3) which allows us to restore
|
| 463 |
|
|
* our original state after RTAS returns.
|
| 464 |
|
|
*/
|
| 465 |
|
|
std r1,PACAR1(r13)
|
| 466 |
|
|
mfmsr r6
|
| 467 |
|
|
std r6,PACASAVEDMSR(r13)
|
| 468 |
|
|
|
| 469 |
|
|
/* Setup our real return addr */
|
| 470 |
|
|
SET_REG_TO_LABEL(r4,.rtas_return_loc)
|
| 471 |
|
|
SET_REG_TO_CONST(r9,KERNELBASE)
|
| 472 |
|
|
sub r4,r4,r9
|
| 473 |
|
|
mtlr r4
|
| 474 |
|
|
|
| 475 |
|
|
li r0,0
|
| 476 |
|
|
ori r0,r0,MSR_EE|MSR_SE|MSR_BE|MSR_RI
|
| 477 |
|
|
andc r0,r6,r0
|
| 478 |
|
|
|
| 479 |
|
|
li r9,1
|
| 480 |
|
|
rldicr r9,r9,MSR_SF_LG,(63-MSR_SF_LG)
|
| 481 |
|
|
ori r9,r9,MSR_IR|MSR_DR|MSR_FE0|MSR_FE1|MSR_FP|MSR_RI
|
| 482 |
|
|
andc r6,r0,r9
|
| 483 |
|
|
sync /* disable interrupts so SRR0/1 */
|
| 484 |
|
|
mtmsrd r0 /* don't get trashed */
|
| 485 |
|
|
|
| 486 |
|
|
SET_REG_TO_LABEL(r4,rtas)
|
| 487 |
|
|
ld r5,RTASENTRY(r4) /* get the rtas->entry value */
|
| 488 |
|
|
ld r4,RTASBASE(r4) /* get the rtas->base value */
|
| 489 |
|
|
|
| 490 |
|
|
mtspr SRR0,r5
|
| 491 |
|
|
mtspr SRR1,r6
|
| 492 |
|
|
rfid
|
| 493 |
|
|
|
| 494 |
|
|
_STATIC(rtas_return_loc)
|
| 495 |
|
|
/* relocation is off at this point */
|
| 496 |
|
|
mfspr r13,SPRG3 /* Get PACA */
|
| 497 |
|
|
SET_REG_TO_CONST(r5, KERNELBASE)
|
| 498 |
|
|
sub r13,r13,r5 /* RELOC the PACA base pointer */
|
| 499 |
|
|
|
| 500 |
|
|
mfmsr r6 /* Clear RI while SRR0/1 are live */
|
| 501 |
|
|
li r0,MSR_RI
|
| 502 |
|
|
andc r6,r6,r0
|
| 503 |
|
|
sync
|
| 504 |
|
|
mtmsrd r6
|
| 505 |
|
|
|
| 506 |
|
|
ld r1,PACAR1(r13) /* Restore our SP */
|
| 507 |
|
|
LOADADDR(r3,.rtas_restore_regs)
|
| 508 |
|
|
ld r4,PACASAVEDMSR(r13) /* Restore our MSR */
|
| 509 |
|
|
|
| 510 |
|
|
mtspr SRR0,r3
|
| 511 |
|
|
mtspr SRR1,r4
|
| 512 |
|
|
rfid
|
| 513 |
|
|
|
| 514 |
|
|
_STATIC(rtas_restore_regs)
|
| 515 |
|
|
/* relocation is on at this point */
|
| 516 |
|
|
REST_GPR(2, r1) /* Restore the TOC */
|
| 517 |
|
|
REST_GPR(13, r1) /* Restore current */
|
| 518 |
|
|
REST_8GPRS(14, r1) /* Restore the non-volatiles */
|
| 519 |
|
|
REST_10GPRS(22, r1) /* ditto */
|
| 520 |
|
|
|
| 521 |
|
|
/* put back paca in r13 */
|
| 522 |
|
|
mfspr r13,SPRG3
|
| 523 |
|
|
|
| 524 |
|
|
ld r4,_CCR(r1)
|
| 525 |
|
|
mtcr r4
|
| 526 |
|
|
ld r5,_CTR(r1)
|
| 527 |
|
|
mtctr r5
|
| 528 |
|
|
ld r6,_XER(r1)
|
| 529 |
|
|
mtspr XER,r6
|
| 530 |
|
|
ld r7,_DAR(r1)
|
| 531 |
|
|
mtdar r7
|
| 532 |
|
|
ld r8,_DSISR(r1)
|
| 533 |
|
|
mtdsisr r8
|
| 534 |
|
|
ld r9,_SRR0(r1)
|
| 535 |
|
|
mtsrr0 r9
|
| 536 |
|
|
ld r10,_SRR1(r1)
|
| 537 |
|
|
mtsrr1 r10
|
| 538 |
|
|
|
| 539 |
|
|
addi r1,r1,RTAS_FRAME_SIZE /* Unstack our frame */
|
| 540 |
|
|
ld r0,16(r1) /* get return address */
|
| 541 |
|
|
|
| 542 |
|
|
mtlr r0
|
| 543 |
|
|
blr /* return to caller */
|
| 544 |
|
|
|
| 545 |
|
|
_GLOBAL(enter_prom)
|
| 546 |
|
|
mflr r0
|
| 547 |
|
|
std r0,16(r1)
|
| 548 |
|
|
stdu r1,-PROM_FRAME_SIZE(r1) /* Save SP and create stack space */
|
| 549 |
|
|
|
| 550 |
|
|
/* Because PROM is running in 32b mode, it clobbers the high order half
|
| 551 |
|
|
* of all registers that it saves. We therefore save those registers
|
| 552 |
|
|
* PROM might touch to the stack. (r0, r3-r13 are caller saved)
|
| 553 |
|
|
*/
|
| 554 |
|
|
SAVE_8GPRS(2, r1) /* Save the TOC & incoming param(s) */
|
| 555 |
|
|
SAVE_GPR(13, r1) /* Save current */
|
| 556 |
|
|
SAVE_8GPRS(14, r1) /* Save the non-volatiles */
|
| 557 |
|
|
SAVE_10GPRS(22, r1) /* ditto */
|
| 558 |
|
|
|
| 559 |
|
|
mfcr r4
|
| 560 |
|
|
std r4,_CCR(r1)
|
| 561 |
|
|
mfctr r5
|
| 562 |
|
|
std r5,_CTR(r1)
|
| 563 |
|
|
mfspr r6,XER
|
| 564 |
|
|
std r6,_XER(r1)
|
| 565 |
|
|
mfdar r7
|
| 566 |
|
|
std r7,_DAR(r1)
|
| 567 |
|
|
mfdsisr r8
|
| 568 |
|
|
std r8,_DSISR(r1)
|
| 569 |
|
|
mfsrr0 r9
|
| 570 |
|
|
std r9,_SRR0(r1)
|
| 571 |
|
|
mfsrr1 r10
|
| 572 |
|
|
std r10,_SRR1(r1)
|
| 573 |
|
|
mfmsr r11
|
| 574 |
|
|
std r11,_MSR(r1)
|
| 575 |
|
|
|
| 576 |
|
|
/* Unfortunately, the stack pointer is also clobbered, so it is saved
|
| 577 |
|
|
* in the SPRG2 which allows us to restore our original state after
|
| 578 |
|
|
* PROM returns.
|
| 579 |
|
|
*/
|
| 580 |
|
|
mtspr SPRG2,r1
|
| 581 |
|
|
|
| 582 |
|
|
/* put a relocation offset into r3 */
|
| 583 |
|
|
bl .reloc_offset
|
| 584 |
|
|
LOADADDR(r12,prom)
|
| 585 |
|
|
sub r12,r12,r3
|
| 586 |
|
|
ld r12,PROMENTRY(r12) /* get the prom->entry value */
|
| 587 |
|
|
mtlr r12
|
| 588 |
|
|
|
| 589 |
|
|
mfmsr r11 /* grab the current MSR */
|
| 590 |
|
|
li r12,1
|
| 591 |
|
|
rldicr r12,r12,MSR_SF_LG,(63-MSR_SF_LG)
|
| 592 |
|
|
andc r11,r11,r12
|
| 593 |
|
|
li r12,1
|
| 594 |
|
|
rldicr r12,r12,MSR_ISF_LG,(63-MSR_ISF_LG)
|
| 595 |
|
|
andc r11,r11,r12
|
| 596 |
|
|
mtmsrd r11
|
| 597 |
|
|
isync
|
| 598 |
|
|
|
| 599 |
|
|
REST_8GPRS(2, r1) /* Restore the TOC & param(s) */
|
| 600 |
|
|
REST_GPR(13, r1) /* Restore current */
|
| 601 |
|
|
REST_8GPRS(14, r1) /* Restore the non-volatiles */
|
| 602 |
|
|
REST_10GPRS(22, r1) /* ditto */
|
| 603 |
|
|
blrl /* Entering PROM here... */
|
| 604 |
|
|
|
| 605 |
|
|
mfspr r1,SPRG2 /* Restore the stack pointer */
|
| 606 |
|
|
ld r6,_MSR(r1) /* Restore the MSR */
|
| 607 |
|
|
mtmsrd r6
|
| 608 |
|
|
isync
|
| 609 |
|
|
|
| 610 |
|
|
REST_GPR(2, r1) /* Restore the TOC */
|
| 611 |
|
|
REST_GPR(13, r1) /* Restore current */
|
| 612 |
|
|
REST_8GPRS(14, r1) /* Restore the non-volatiles */
|
| 613 |
|
|
REST_10GPRS(22, r1) /* ditto */
|
| 614 |
|
|
|
| 615 |
|
|
ld r4,_CCR(r1)
|
| 616 |
|
|
mtcr r4
|
| 617 |
|
|
ld r5,_CTR(r1)
|
| 618 |
|
|
mtctr r5
|
| 619 |
|
|
ld r6,_XER(r1)
|
| 620 |
|
|
mtspr XER,r6
|
| 621 |
|
|
ld r7,_DAR(r1)
|
| 622 |
|
|
mtdar r7
|
| 623 |
|
|
ld r8,_DSISR(r1)
|
| 624 |
|
|
mtdsisr r8
|
| 625 |
|
|
ld r9,_SRR0(r1)
|
| 626 |
|
|
mtsrr0 r9
|
| 627 |
|
|
ld r10,_SRR1(r1)
|
| 628 |
|
|
mtsrr1 r10
|
| 629 |
|
|
addi r1,r1,PROM_FRAME_SIZE
|
| 630 |
|
|
ld r0,16(r1) /* get return address */
|
| 631 |
|
|
|
| 632 |
|
|
mtlr r0
|
| 633 |
|
|
blr /* return to caller */
|
