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comparison packages/hal/calmrisc32/arch/current/src/hal_syscall.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents
children d2c90368aeef
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207:74c807ddde34 208:e0c0827131d1
1 //=============================================================================
2 //
3 // hal_syscall.c
4 //
5 //
6 //
7 //=============================================================================
8 //####ECOSGPLCOPYRIGHTBEGIN####
9 // -------------------------------------------
10 // This file is part of eCos, the Embedded Configurable Operating System.
11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
12 //
13 // eCos is free software; you can redistribute it and/or modify it under
14 // the terms of the GNU General Public License as published by the Free
15 // Software Foundation; either version 2 or (at your option) any later version.
16 //
17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
20 // for more details.
21 //
22 // You should have received a copy of the GNU General Public License along
23 // with eCos; if not, write to the Free Software Foundation, Inc.,
24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25 //
26 // As a special exception, if other files instantiate templates or use macros
27 // or inline functions from this file, or you compile this file and link it
28 // with other works to produce a work based on this file, this file does not
29 // by itself cause the resulting work to be covered by the GNU General Public
30 // License. However the source code for this file must still be made available
31 // in accordance with section (3) of the GNU General Public License.
32 //
33 // This exception does not invalidate any other reasons why a work based on
34 // this file might be covered by the GNU General Public License.
35 //
36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
37 // at http://sources.redhat.com/ecos/ecos-license
38 // -------------------------------------------
39 //####ECOSGPLCOPYRIGHTEND####
40 //=============================================================================
41 //#####DESCRIPTIONBEGIN####
42 //
43 // Author(s): msalter
44 // Contributors:msalter
45 // Date: 2000-11-5
46 // Purpose:
47 // Description:
48 //
49 //
50 //
51 //####DESCRIPTIONEND####
52 //
53 //=============================================================================
54
55 #include <pkgconf/hal.h>
56
57 #ifdef CYGPKG_REDBOOT
58 #include <pkgconf/redboot.h>
59 #endif
60
61 #if defined(CYGSEM_REDBOOT_BSP_SYSCALLS)
62
63 #include <cyg/hal/hal_stub.h> // Our header
64 #include <cyg/hal/hal_arch.h> // HAL_BREAKINST
65 #include <cyg/hal/hal_cache.h> // HAL_xCACHE_x
66 #include <cyg/hal/hal_intr.h> // interrupt disable/restore
67
68 #include <cyg/hal/hal_if.h> // ROM calling interface
69 #include <cyg/hal/hal_misc.h> // Helper functions
70
71 extern CYG_ADDRWORD __do_syscall(CYG_ADDRWORD func, // syscall function number
72 CYG_ADDRWORD arg1, CYG_ADDRWORD arg2, // up to four args.
73 CYG_ADDRWORD arg3, CYG_ADDRWORD arg4,
74 CYG_ADDRWORD *retval, // syscall return value
75 CYG_ADDRWORD *sig); // signal to return (or 0)
76
77 #define SYS_exit 1
78 #define SYS_interrupt 1000
79
80 int
81 hal_syscall_handler(void)
82 {
83 CYG_ADDRWORD func, arg1, arg2, arg3, arg4;
84 CYG_ADDRWORD err, sig;
85 int retreg;
86 target_register_t sr = get_register(REG_SR);
87
88 if ((sr & CYGARC_SR_PM) == 0 || (sr & CYGARC_SR_BS) == 0) {
89 // bank zero regs
90 func = get_register(REG_B0R0);
91 arg1 = get_register(REG_B0R1);
92 arg2 = get_register(REG_B0R2);
93 arg3 = get_register(REG_B0R3);
94 arg4 = 0;
95 retreg = REG_B0R0;
96 } else {
97 func = get_register(REG_B1R0);
98 arg1 = get_register(REG_B1R1);
99 arg2 = get_register(REG_B1R2);
100 arg3 = get_register(REG_B1R3);
101 retreg = REG_B1R0;
102 }
103
104 set_pc(get_pc()+2);
105
106 if (func == SYS_exit) {
107 // We want to stop in exit so that the user may poke around
108 // to see why his app exited.
109 return SIGTRAP;
110 }
111
112 if (func == SYS_interrupt) {
113 // A console interrupt landed us here.
114 // Invoke the debug agent so as to cause a SIGINT.
115 return SIGINT;
116 }
117
118 if (__do_syscall(func, arg1, arg2, arg3, arg4, &err, &sig)) {
119 put_register(retreg, err);
120 return (int)sig;
121 }
122
123 return SIGTRAP;
124 }
125
126 #endif // CYGSEM_REDBOOT_BSP_SYSCALLS