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Annotation of XNU/osfmk/kdp/ml/ppc/kdp_asm.s, revision 1.1.1.1

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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