Annotation of sys/arch/alpha/stand/prom_disp.S, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: prom_disp.S,v 1.4 1996/10/30 22:40:34 niklas Exp $ */
! 2: /* $NetBSD: prom_disp.S,v 1.5 1996/10/17 02:50:39 cgd Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
! 6: * All rights reserved.
! 7: *
! 8: * Author: Chris G. Demetriou
! 9: *
! 10: * Permission to use, copy, modify and distribute this software and
! 11: * its documentation is hereby granted, provided that both the copyright
! 12: * notice and this permission notice appear in all copies of the
! 13: * software, derivative works or modified versions, and any portions
! 14: * thereof, and that both notices appear in supporting documentation.
! 15: *
! 16: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
! 17: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
! 18: * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
! 19: *
! 20: * Carnegie Mellon requests users of this software to return to
! 21: *
! 22: * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
! 23: * School of Computer Science
! 24: * Carnegie Mellon University
! 25: * Pittsburgh PA 15213-3890
! 26: *
! 27: * any improvements or extensions that they make and grant Carnegie the
! 28: * rights to redistribute these changes.
! 29: */
! 30:
! 31: #ifndef _LOCORE
! 32: #include "include/asm.h"
! 33: #include "include/prom.h"
! 34: #include "include/rpb.h"
! 35: #endif
! 36:
! 37: .globl prom_dispatch_v
! 38: .comm prom_dispatch_v,16
! 39:
! 40: .text
! 41: .align 4
! 42:
! 43: /*
! 44: * Dispatcher routine. Implements prom's calling machinery, saves our
! 45: * callee-saved registers as required by C.
! 46: */
! 47: #define D_RA (7*8)
! 48: #define D_S0 (8*8)
! 49: #define D_S1 (9*8)
! 50: #define D_S2 (10*8)
! 51: #define D_S3 (11*8)
! 52: #define D_S4 (12*8)
! 53: #define D_S5 (13*8)
! 54: #define D_S6 (14*8)
! 55: #define DISPATCH_FRAME_SIZE (15*8)
! 56: #define DISPATCH_REGS IM_RA|IM_S0|IM_S1|IM_S2|IM_S3|IM_S4|IM_S5|IM_S6
! 57:
! 58: NESTED(prom_dispatch, 5, DISPATCH_FRAME_SIZE, ra, DISPATCH_REGS, 0)
! 59: LDGP(pv)
! 60:
! 61: lda sp, -DISPATCH_FRAME_SIZE(sp)
! 62: stq ra, D_RA(sp)
! 63: stq s0, D_S0(sp)
! 64: stq s1, D_S1(sp)
! 65: stq s2, D_S2(sp)
! 66: stq s3, D_S3(sp)
! 67: stq s4, D_S4(sp)
! 68: stq s5, D_S5(sp)
! 69: stq s6, D_S6(sp)
! 70:
! 71: /* Lord have mercy because.. I would not. */
! 72: /* #define STUPID_PROM_IS_32_BITS */
! 73: #ifdef STUPID_PROM_IS_32_BITS
! 74: ldah s0, 0x2000(zero) /* hack for hack */
! 75: lda s0, (0x2000-8)(s0)
! 76:
! 77: stq sp, 0(s0)
! 78: or s0, zero, sp
! 79: #endif /* STUPID_PROM_IS_32_BITS */
! 80:
! 81: lda pv, prom_dispatch_v
! 82: ldq v0, 0(pv) /* routine */
! 83: ldq pv, 8(pv) /* routine_arg */
! 84:
! 85: jsr ra, (v0)
! 86:
! 87: #ifdef STUPID_PROM_IS_32_BITS
! 88: ldah s0, 0x2000(zero) /* hack for hack */
! 89: lda s0, (0x2000-8)(s0)
! 90:
! 91: ldq sp, 0(s0)
! 92: #endif /* STUPID_PROM_IS_32_BITS */
! 93:
! 94: ldq ra, D_RA(sp)
! 95: ldq s0, D_S0(sp)
! 96: ldq s1, D_S1(sp)
! 97: ldq s2, D_S2(sp)
! 98: ldq s3, D_S3(sp)
! 99: ldq s4, D_S4(sp)
! 100: ldq s5, D_S5(sp)
! 101: ldq s6, D_S6(sp)
! 102: lda sp, DISPATCH_FRAME_SIZE(sp)
! 103: RET
! 104: END(prom_dispatch)
! 105:
! 106: #undef D_RA
! 107: #undef D_S0
! 108: #undef D_S1
! 109: #undef D_S2
! 110: #undef D_S3
! 111: #undef D_S4
! 112: #undef D_S5
! 113: #undef D_S6
! 114: #undef DISPATCH_FRAME_SIZE
! 115: #undef DISPATCH_REGS
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