summaryrefslogtreecommitdiff
path: root/arch/sparc/kernel/kgdb_32.c
blob: 7580775a14b9e71567252dae142f5bb111efdcf8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
// SPDX-License-Identifier: GPL-2.0
/* kgdb.c: KGDB support for 32-bit sparc.
 *
 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
 */

#include <linux/kgdb.h>
#include <linux/kdebug.h>
#include <linux/sched.h>

#include <asm/kdebug.h>
#include <asm/ptrace.h>
#include <asm/irq.h>
#include <asm/cacheflush.h>

#include "kernel.h"
#include "entry.h"

void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
	struct reg_window32 *win;
	int i;

	gdb_regs[GDB_G0] = 0;
	for (i = 0; i < 15; i++)
		gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i];

	win = (struct reg_window32 *) regs->u_regs[UREG_FP];
	for (i = 0; i < 8; i++)
		gdb_regs[GDB_L0 + i] = win->locals[i];
	for (i = 0; i < 8; i++)
		gdb_regs[GDB_I0 + i] = win->ins[i];

	for (i = GDB_F0; i <= GDB_F31; i++)
		gdb_regs[i] = 0;

	gdb_regs[GDB_Y] = regs->y;
	gdb_regs[GDB_PSR] = regs->psr;
	gdb_regs[GDB_WIM] = 0;
	gdb_regs[GDB_TBR] = (unsigned long) &trapbase;
	gdb_regs[GDB_PC] = regs->pc;
	gdb_regs[GDB_NPC] = regs->npc;
	gdb_regs[GDB_FSR] = 0;
	gdb_regs[GDB_CSR] = 0;
}

void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
{
	struct thread_info *t = task_thread_info(p);
	struct reg_window32 *win;
	int i;

	for (i = GDB_G0; i < GDB_G6; i++)
		gdb_regs[i] = 0;
	gdb_regs[GDB_G6] = (unsigned long) t;
	gdb_regs[GDB_G7] = 0;
	for (i = GDB_O0; i < GDB_SP; i++)
		gdb_regs[i] = 0;
	gdb_regs[GDB_SP] = t->ksp;
	gdb_regs[GDB_O7] = 0;

	win = (struct reg_window32 *) t->ksp;
	for (i = 0; i < 8; i++)
		gdb_regs[GDB_L0 + i] = win->locals[i];
	for (i = 0; i < 8; i++)
		gdb_regs[GDB_I0 + i] = win->ins[i];

	for (i = GDB_F0; i <= GDB_F31; i++)
		gdb_regs[i] = 0;

	gdb_regs[GDB_Y] = 0;

	gdb_regs[GDB_PSR] = t->kpsr;
	gdb_regs[GDB_WIM] = t->kwim;
	gdb_regs[GDB_TBR] = (unsigned long) &trapbase;
	gdb_regs[GDB_PC] = t->kpc;
	gdb_regs[GDB_NPC] = t->kpc + 4;
	gdb_regs[GDB_FSR] = 0;
	gdb_regs[GDB_CSR] = 0;
}

void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
	struct reg_window32 *win;
	int i;

	for (i = 0; i < 15; i++)
		regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i];

	/* If the PSR register is changing, we have to preserve
	 * the CWP field, otherwise window save/restore explodes.
	 */
	if (regs->psr != gdb_regs[GDB_PSR]) {
		unsigned long cwp = regs->psr & PSR_CWP;

		regs->psr = (gdb_regs[GDB_PSR] & ~PSR_CWP) | cwp;
	}

	regs->pc = gdb_regs[GDB_PC];
	regs->npc = gdb_regs[GDB_NPC];
	regs->y = gdb_regs[GDB_Y];

	win = (struct reg_window32 *) regs->u_regs[UREG_FP];
	for (i = 0; i < 8; i++)
		win->locals[i] = gdb_regs[GDB_L0 + i];
	for (i = 0; i < 8; i++)
		win->ins[i] = gdb_regs[GDB_I0 + i];
}

int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
			       char *remcomInBuffer, char *remcomOutBuffer,
			       struct pt_regs *linux_regs)
{
	unsigned long addr;
	char *ptr;

	switch (remcomInBuffer[0]) {
	case 'c':
		/* try to read optional parameter, pc unchanged if no parm */
		ptr = &remcomInBuffer[1];
		if (kgdb_hex2long(&ptr, &addr)) {
			linux_regs->pc = addr;
			linux_regs->npc = addr + 4;
		}
		/* fall through */

	case 'D':
	case 'k':
		if (linux_regs->pc == (unsigned long) arch_kgdb_breakpoint) {
			linux_regs->pc = linux_regs->npc;
			linux_regs->npc += 4;
		}
		return 0;
	}
	return -1;
}

asmlinkage void kgdb_trap(unsigned long trap_level, struct pt_regs *regs)
{
	unsigned long flags;

	if (user_mode(regs)) {
		do_hw_interrupt(regs, trap_level);
		return;
	}

	flushw_all();

	local_irq_save(flags);
	kgdb_handle_exception(trap_level, SIGTRAP, 0, regs);
	local_irq_restore(flags);
}

int kgdb_arch_init(void)
{
	return 0;
}

void kgdb_arch_exit(void)
{
}

void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
{
	regs->pc = ip;
	regs->npc = regs->pc + 4;
}

const struct kgdb_arch arch_kgdb_ops = {
	/* Breakpoint instruction: ta 0x7d */
	.gdb_bpt_instr		= { 0x91, 0xd0, 0x20, 0x7d },
};