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Annotation of sys/arch/alpha/alpha/debug.s, Revision 1.1

1.1     ! nbrk        1: /* $OpenBSD: debug.s,v 1.3 2006/04/13 14:37:26 brad Exp $ */
        !             2: /* $NetBSD: debug.s,v 1.5 1999/06/18 18:11:56 thorpej Exp $ */
        !             3:
        !             4: /*-
        !             5:  * Copyright (c) 1999 The NetBSD Foundation, Inc.
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * This code is derived from software contributed to The NetBSD Foundation
        !             9:  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
        !            10:  * NASA Ames Research Center.
        !            11:  *
        !            12:  * Redistribution and use in source and binary forms, with or without
        !            13:  * modification, are permitted provided that the following conditions
        !            14:  * are met:
        !            15:  * 1. Redistributions of source code must retain the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer.
        !            17:  * 2. Redistributions in binary form must reproduce the above copyright
        !            18:  *    notice, this list of conditions and the following disclaimer in the
        !            19:  *    documentation and/or other materials provided with the distribution.
        !            20:  * 3. All advertising materials mentioning features or use of this software
        !            21:  *    must display the following acknowledgement:
        !            22:  *     This product includes software developed by the NetBSD
        !            23:  *     Foundation, Inc. and its contributors.
        !            24:  * 4. Neither the name of The NetBSD Foundation nor the names of its
        !            25:  *    contributors may be used to endorse or promote products derived
        !            26:  *    from this software without specific prior written permission.
        !            27:  *
        !            28:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
        !            29:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
        !            30:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
        !            31:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
        !            32:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
        !            33:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
        !            34:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
        !            35:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
        !            36:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
        !            37:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        !            38:  * POSSIBILITY OF SUCH DAMAGE.
        !            39:  */
        !            40:
        !            41: /*
        !            42:  * Debugger glue.
        !            43:  */
        !            44:
        !            45:        .text
        !            46: inc6:  .stabs  __FILE__,132,0,0,inc6; .loc     1 __LINE__
        !            47:
        !            48: /*
        !            49:  * Debugger stack.
        !            50:  */
        !            51: #define        DEBUG_STACK_SIZE        8192
        !            52: BSS(debug_stack_bottom, DEBUG_STACK_SIZE)
        !            53: ABS(debug_stack_top, debug_stack_bottom + DEBUG_STACK_SIZE)
        !            54:
        !            55: /*
        !            56:  * alpha_debug:
        !            57:  *
        !            58:  *     Single debugger entry point, handling the housekeeping
        !            59:  *     chores we need to deal with.
        !            60:  *
        !            61:  *     Arguments are:
        !            62:  *
        !            63:  *             a0      a0 from trap
        !            64:  *             a1      a1 from trap
        !            65:  *             a2      a2 from trap
        !            66:  *             a3      kernel trap entry point
        !            67:  *             a4      frame pointer
        !            68:  */
        !            69: NESTED_NOPROFILE(alpha_debug, 5, 32, ra, IM_RA|IM_S0, 0)
        !            70:        br      pv, 1f
        !            71: 1:     LDGP(pv)
        !            72:        lda     t0, FRAME_SIZE*8(a4)    /* what would sp have been? */
        !            73:        stq     t0, FRAME_SP*8(a4)      /* belatedly save sp for ddb view */
        !            74:        lda     sp, -32(sp)             /* set up stack frame */
        !            75:        stq     ra, (32-8)(sp)          /* save ra */
        !            76:        stq     s0, (32-16)(sp)         /* save s0 */
        !            77:
        !            78:        /* Remember our current stack pointer. */
        !            79:        mov     sp, s0
        !            80:
        !            81: #if defined(MULTIPROCESSOR)
        !            82:        /*
        !            83:         * XXX PAUSE ALL OTHER CPUs.
        !            84:         */
        !            85: #endif
        !            86:
        !            87:        /*
        !            88:         * Switch to the debug stack if we're not on it already.
        !            89:         */
        !            90:        lda     t0, debug_stack_bottom
        !            91:        cmpule  sp, t0, t1              /* sp <= debug_stack_bottom */
        !            92:        bne     t1, 2f                  /* yes, switch now */
        !            93:
        !            94:        lda     t0, debug_stack_top
        !            95:        cmpule  t0, sp, t1              /* debug_stack_top <= sp? */
        !            96:        bne     t1, 3f                  /* yes, we're on the debug stack */
        !            97:
        !            98: 2:     lda     sp, debug_stack_top     /* sp <- debug_stack_top */
        !            99:
        !           100: 3:     /* Dispatch to the debugger - arguments are already in place. */
        !           101:        CALL(ddb_trap)
        !           102:
        !           103:        /* Debugger return value in v0; switch back to our previous stack. */
        !           104:        mov     s0, sp
        !           105:
        !           106: #if defined(MULTIPROCESSOR)
        !           107:        /*
        !           108:         * XXX RESUME ALL OTHER CPUs.
        !           109:         */
        !           110: #endif
        !           111:
        !           112:        ldq     ra, (32-8)(sp)          /* restore ra */
        !           113:        ldq     s0, (32-16)(sp)         /* restore s0 */
        !           114:        lda     sp, 32(sp)              /* pop stack frame */
        !           115:        RET
        !           116:        END(alpha_debug)