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Annotation of XNU/osfmk/kdp/ml/ppc/kdp_asm.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: #include <mach_kdb.h>
        !            23: #include <mach_kgdb.h>
        !            24: #include <mach_debug.h>
        !            25: #include <assym.s>
        !            26: #include <ppc/asm.h>
        !            27: #include <ppc/proc_reg.h>
        !            28: #include <mach/ppc/vm_param.h>
        !            29: 
        !            30: /* void kdp_call_with_ctx(int type, struct ppc_thread_state *ssp)
        !            31:  *
        !            32:  * Switch on kdp stack and  enter the debugger. On return,
        !            33:  * switch back to the previous stack
        !            34:  *
        !            35:  * If the kdp stack is not free, we allocate ourselves a frame below
        !            36:  * the current kdp frame. This should never occur in a perfect world.
        !            37:  */
        !            38: 
        !            39: ENTRY(kdp_call_with_ctx, TAG_NO_FRAME_USED)
        !            40:        
        !            41:        mfmsr   r7                                      /* Get the MSR */
        !            42:        mflr    r0
        !            43:        rlwinm  r7,r7,0,MSR_EE_BIT+1,MSR_EE_BIT-1       /* Turn off interruptions enable bit */
        !            44:        mtmsr   r7
        !            45:        mfsprg  r8,0                            /* Get the per_proc block address */
        !            46:        stw     r0,     FM_LR_SAVE(r1)          /* save lr in the current frame */
        !            47:        
        !            48:        lwz     r9,     PP_DEBSTACKPTR(r8)      /* get kdp stack pointer */
        !            49:        cmpwi   r9,     0
        !            50:        bne     0f
        !            51: 
        !            52: #ifdef LET_KDP_REENTER
        !            53:        mr      r9,     r1                      /* get current stack pointer */
        !            54:        subi    r9,     r9,     FM_REDZONE + SS_SIZE
        !            55: #else
        !            56:        bl      EXT(kdp_print_backtrace)
        !            57: #endif
        !            58: 
        !            59: 0:
        !            60:        stw     r1,     FM_ARG0(r9)                     /* Store old stack pointer */
        !            61:        li      r0,     0
        !            62:        stw     r0,     PP_DEBSTACKPTR(r8)      /* Mark kdp stack as busy */
        !            63:        
        !            64:        subi    r1,     r9,     FM_SIZE
        !            65:        stw     r0,     FM_BACKPTR(r1)
        !            66:        
        !            67:        bl      EXT(kdp_trap)
        !            68: 
        !            69:        mfmsr   r0                                      /* Get the MSR */
        !            70:        addi    r1,     r1,     FM_SIZE
        !            71:        rlwinm  r0,r0,0,MSR_EE_BIT+1,MSR_EE_BIT-1       /* Turn off interruptions enable bit */
        !            72:        mtmsr   r0
        !            73: 
        !            74:        mfsprg  r8,0                            /* Get the per_proc block address */
        !            75:        
        !            76:        stw     r1,     PP_DEBSTACKPTR(r8)      /* Mark gdb stack as free */
        !            77:        lwz     r1,     FM_ARG0(r1)
        !            78:        lwz     r0,     FM_LR_SAVE(r1)
        !            79:        mtlr    r0
        !            80: 
        !            81:        blr
        !            82: 
        !            83: 

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