/[gxemul]/trunk/src/useremul/useremul_freebsd.c
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Contents of /trunk/src/useremul/useremul_freebsd.c

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Revision 44 - (show annotations)
Mon Oct 8 16:22:56 2007 UTC (16 years, 6 months ago) by dpavlin
File MIME type: text/plain
File size: 4102 byte(s) 
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1632 2007/09/11 21:46:35 debug Exp $
20070616	Implementing the MIPS32/64 revision 2 "ror" instruction.
20070617	Adding a struct for each physpage which keeps track of which
		ranges within that page (base offset, length) that are
		continuously translatable. When running with native code
		generation enabled (-b), a range is added after each read-
		ahead loop.
		Experimenting with using the physical program counter sample
		data (implemented 20070608) together with the "translatable
		range" information, to figure out which physical address ranges
		would be worth translating to native code (if the number of
		samples falling within a range is above a certain threshold).
20070618	Adding automagic building of .index comment files for
		src/file/, src/promemul/, src src/useremul/ as well.
		Adding a "has been translated" bit to the ranges, so that only
		not-yet-translated ranges will be sampled.
20070619	Moving src/cpu.c and src/memory_rw.c into src/cpus/,
		src/device.c into src/devices/, and src/machine.c into
		src/machines/.
		Creating a skeleton cc/ld native backend module; beginning on
		the function which will detect cc command line, etc.
20070620	Continuing on the native code generation infrastructure.
20070621	Moving src/x11.c and src/console.c into a new src/console/
		subdir (for everything that is console or framebuffer related).
		Moving src/symbol*.c into a new src/symbol/, which should
		contain anything that is symbol handling related.
20070624	Making the program counter sampling threshold a "settings
		variable" (sampling_threshold), i.e. it can now be changed
		during runtime.
		Switching the RELEASE notes format from plain text to HTML.
		If the TMPDIR environment variable is set, it is used instead
		of "/tmp" for temporary files.
		Continuing on the cc/ld backend: simple .c code is generated,
		the compiler and linker are called, etc.
		Adding detection of host architecture to the configure script
		(again), and adding icache invalidation support (only
		implemented for Alpha hosts so far).
20070625	Simplifying the program counter sampling mechanism.
20070626	Removing the cc/ld native code generation stuff, program
		counter sampling, etc; it would not have worked well in the
		general case.
20070627	Removing everything related to native code generation.
20070629	Removing the (practically unusable) support for multiple
		emulations. (The single emulation allowed now still supports
		multiple simultaneous machines, as before.)
		Beginning on PCCTWO and M88K interrupts.
20070723	Adding a dummy skeleton for emulation of M32R processors.
20070901	Fixing a warning found by "gcc version 4.3.0 20070817
		(experimental)" on amd64.
20070905	Removing some more traces of the old "multiple emulations"
		code.
		Also looking in /usr/local/include and /usr/local/lib for
		X11 libs, when running configure.
20070909	Minor updates to the guest OS install instructions, in
		preparation for the NetBSD 4.0 release.
20070918	More testing of NetBSD 4.0 RC1.
1 /*
2 * Copyright (C) 2004-2007 Anders Gavare. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 *
28 * $Id: useremul_freebsd.c,v 1.6 2007/06/17 23:32:20 debug Exp $
29 *
30 * COMMENT: FreeBSD userland (syscall) emulation implementation
31 */
32
33 #include <stdio.h>
34 #include <stdlib.h>
35
36 #include "cpu.h"
37 #include "machine.h"
38 #include "useremul.h"
39
40 #include "errno_freebsd.h"
41 #include "syscall_freebsd.h"
42
43
44 /*
45 * useremul_freebsd_setup():
46 *
47 * Set up an emulated userland environment suitable for running FreeBSD
48 * binaries.
49 */
50 void useremul_freebsd_setup(struct cpu *cpu, int argc, char **host_argv)
51 {
52 switch (cpu->machine->arch) {
53
54 case ARCH_ALPHA:
55 /* According to FreeBSD's /usr/src/lib/csu/alpha/crt1.c: */
56 /* a0 = char **ap */
57 /* a1 = void (*cleanup)(void) from shared loader */
58 /* a2 = struct Struct_Obj_Entry *obj from shared loader */
59 /* a3 = struct ps_strings *ps_strings */
60 cpu->cd.alpha.r[ALPHA_A0] = 0;
61 cpu->cd.alpha.r[ALPHA_A1] = 0;
62 cpu->cd.alpha.r[ALPHA_A2] = 0;
63 cpu->cd.alpha.r[ALPHA_A3] = 0;
64
65 cpu->cd.alpha.r[ALPHA_SP] = 0x11ffc000;
66 break;
67
68 default:
69 fatal("The selected architecture is not supported yet for"
70 " FreeBSD syscall emulation.\n");
71 exit(1);
72 }
73 }
74
75
76 /*
77 * useremul_freebsd():
78 *
79 * FreeBSD/Alpha syscall emulation.
80 */
81 void useremul_freebsd(struct cpu *cpu, uint32_t code)
82 {
83 int syscall_nr = -1;
84 int64_t result = 0, error_flag = 0;
85 uint64_t arg0=0, arg1=0, arg2=0, arg3=0, arg4=0, arg5=0;
86
87
88 /*
89 * Retrieve syscall arguments (in registers and/or the stack):
90 */
91
92 switch (cpu->machine->arch) {
93
94 case ARCH_ALPHA:
95 syscall_nr = cpu->cd.alpha.r[ALPHA_V0];
96 arg0 = cpu->cd.alpha.r[ALPHA_A0];
97 arg1 = cpu->cd.alpha.r[ALPHA_A1];
98 arg2 = cpu->cd.alpha.r[ALPHA_A2];
99 arg3 = cpu->cd.alpha.r[ALPHA_A3];
100 arg4 = cpu->cd.alpha.r[ALPHA_A4];
101 arg5 = cpu->cd.alpha.r[ALPHA_A5];
102
103 if (syscall_nr == FREEBSD_SYS___syscall) {
104 syscall_nr = arg0;
105 arg0 = arg1;
106 arg1 = arg2;
107 arg2 = arg3;
108 arg3 = arg4;
109 arg4 = arg5;
110 /* TODO: stack arguments */
111 }
112
113 break;
114 }
115
116
117 /*
118 * Handle the syscall:
119 */
120
121 switch (syscall_nr) {
122
123 case FREEBSD_SYS_exit:
124 useremul_syscall_exit(cpu, arg0);
125 break;
126
127 case FREEBSD_SYS_sync:
128 useremul_syscall_sync(cpu);
129 break;
130
131 default:
132 fatal("[ UNIMPLEMENTED FreeBSD syscall nr %i ]\n", syscall_nr);
133 error_flag = 1; result = FREEBSD_ENOSYS;
134
135 /* For now, let's abort execution: */
136 cpu->running = 0;
137 }
138
139
140 /*
141 * Return:
142 */
143
144 switch (cpu->machine->arch) {
145
146 case ARCH_ALPHA:
147 cpu->cd.alpha.r[ALPHA_V0] = result;
148 cpu->cd.alpha.r[ALPHA_A3] = error_flag;
149 break;
150 }
151 }
152
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