source: trunk/hal/x86_64/core/hal_exception.c @ 371

Last change on this file since 371 was 371, checked in by max@…, 4 years ago

Treat user/kern exceptions differently.

File size: 3.2 KB
Line 
1/*
2 * hal_exception.c - Implementation of exception handler for x86_64
3 *
4 * Copyright (c) 2017 Maxime Villard
5 *
6 * This file is part of ALMOS-MKH.
7 *
8 * ALMOS-MKH is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; version 2.0 of the License.
11 *
12 * ALMOS-MKH is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include <hal_types.h>
23#include <hal_irqmask.h>
24#include <hal_exception.h>
25#include <thread.h>
26#include <errno.h>
27#include <core.h>
28#include <do_exception.h>
29
30#include <hal_kentry.h>
31#include <hal_internal.h>
32#include <hal_segmentation.h>
33
34static const char *exc_type[] = {
35        [T_PRIVINFLT]= "privileged instruction fault",
36        [T_BPTFLT] = "breakpoint trap",
37        [T_ARITHTRAP] = "arithmetic trap",
38        [T_ASTFLT] = "asynchronous system trap",
39        [T_PROTFLT] = "protection fault",
40        [T_TRCTRAP] = "trace trap",
41        [T_PAGEFLT] = "page fault",
42        [T_ALIGNFLT] = "alignment fault",
43        [T_DIVIDE] = "integer divide fault",
44        [T_NMI] = "non-maskable interrupt",
45        [T_OFLOW] = "overflow trap",
46        [T_BOUND] = "bounds check fault",
47        [T_DNA] = "FPU not available fault",
48        [T_DOUBLEFLT] = "double fault",
49        [T_FPOPFLT] = "FPU operand fetch fault",
50        [T_TSSFLT] = "invalid TSS fault",
51        [T_SEGNPFLT] = "segment not present fault",
52        [T_STKFLT] = "stack fault",
53        [T_MCA] = "machine check fault",
54        [T_XMM] = "SSE FP exception",
55};
56int     exc_types = __arraycount(exc_type);
57
58static void hal_exception_kern(hal_trapframe_t *tf)
59{
60        uint64_t trapno = tf->tf_trapno;
61        const char *buf;
62
63        if (trapno < exc_types) {
64                buf = exc_type[trapno];
65        } else {
66                buf = "unknown exception";
67        }
68
69        x86_lock();
70        x86_printf("\n****** EXCEPTION OCCURRED IN KERNEL MODE ******\n");
71        x86_printf("%s\n", (char *)buf);
72        x86_printf("-> rip = %Z\n", tf->tf_rip);
73        x86_printf("-> rdi = %Z\n", tf->tf_rdi);
74        x86_printf("-> rbp = %Z\n", tf->tf_rbp);
75        x86_printf("-> tls = %Z (gid=%Z)\n", (uint64_t)curtls(),
76            (uint64_t)hal_get_gid());
77        x86_printf("-> err = %Z\n", tf->tf_err);
78        if (trapno == T_PAGEFLT)
79                x86_printf("-> va  = %Z\n", rcr2());
80        x86_printf("\n***********************************************\n");
81        x86_unlock();
82
83        while (1);
84}
85
86static void hal_exception_user(hal_trapframe_t *tf)
87{
88        switch (tf->tf_trapno) {
89                case T_PAGEFLT:
90                        // TODO
91                        //do_exception(curtls()->tls_thr, true);
92
93                default:
94                        x86_panic("userland not yet handled");
95        }
96}
97
98/*
99 * Exception handler.
100 */
101void hal_exception_entry(hal_trapframe_t *tf)
102{
103        if ((tf->tf_cs & SEL_RPL) == SEL_UPL)
104                hal_exception_user(tf);
105        else
106                hal_exception_kern(tf);
107}
108
109/* -------------------------------------------------------------------------- */
110
111void hal_do_exception( thread_t * this,
112                       reg_t    * regs_tbl )
113{
114        x86_panic((char *)__func__);
115}
116
117void hal_exception_dump( thread_t * this,
118                         reg_t    * regs_tbl )
119{
120        x86_panic((char *)__func__);
121}
122
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