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1/* kgdb.c: KGDB support for 32-bit sparc.
2 *
3 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
4 */
5
6#include <linux/kgdb.h>
7#include <linux/kdebug.h>
8#include <linux/sched.h>
9
10#include <asm/kdebug.h>
11#include <asm/ptrace.h>
12#include <asm/irq.h>
13#include <asm/cacheflush.h>
14
15#include "kernel.h"
16#include "entry.h"
17
18void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
19{
20 struct reg_window32 *win;
21 int i;
22
23 gdb_regs[GDB_G0] = 0;
24 for (i = 0; i < 15; i++)
25 gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i];
26
27 win = (struct reg_window32 *) regs->u_regs[UREG_FP];
28 for (i = 0; i < 8; i++)
29 gdb_regs[GDB_L0 + i] = win->locals[i];
30 for (i = 0; i < 8; i++)
31 gdb_regs[GDB_I0 + i] = win->ins[i];
32
33 for (i = GDB_F0; i <= GDB_F31; i++)
34 gdb_regs[i] = 0;
35
36 gdb_regs[GDB_Y] = regs->y;
37 gdb_regs[GDB_PSR] = regs->psr;
38 gdb_regs[GDB_WIM] = 0;
39 gdb_regs[GDB_TBR] = (unsigned long) &trapbase;
40 gdb_regs[GDB_PC] = regs->pc;
41 gdb_regs[GDB_NPC] = regs->npc;
42 gdb_regs[GDB_FSR] = 0;
43 gdb_regs[GDB_CSR] = 0;
44}
45
46void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
47{
48 struct thread_info *t = task_thread_info(p);
49 struct reg_window32 *win;
50 int i;
51
52 for (i = GDB_G0; i < GDB_G6; i++)
53 gdb_regs[i] = 0;
54 gdb_regs[GDB_G6] = (unsigned long) t;
55 gdb_regs[GDB_G7] = 0;
56 for (i = GDB_O0; i < GDB_SP; i++)
57 gdb_regs[i] = 0;
58 gdb_regs[GDB_SP] = t->ksp;
59 gdb_regs[GDB_O7] = 0;
60
61 win = (struct reg_window32 *) t->ksp;
62 for (i = 0; i < 8; i++)
63 gdb_regs[GDB_L0 + i] = win->locals[i];
64 for (i = 0; i < 8; i++)
65 gdb_regs[GDB_I0 + i] = win->ins[i];
66
67 for (i = GDB_F0; i <= GDB_F31; i++)
68 gdb_regs[i] = 0;
69
70 gdb_regs[GDB_Y] = 0;
71
72 gdb_regs[GDB_PSR] = t->kpsr;
73 gdb_regs[GDB_WIM] = t->kwim;
74 gdb_regs[GDB_TBR] = (unsigned long) &trapbase;
75 gdb_regs[GDB_PC] = t->kpc;
76 gdb_regs[GDB_NPC] = t->kpc + 4;
77 gdb_regs[GDB_FSR] = 0;
78 gdb_regs[GDB_CSR] = 0;
79}
80
81void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
82{
83 struct reg_window32 *win;
84 int i;
85
86 for (i = 0; i < 15; i++)
87 regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i];
88
89 /* If the PSR register is changing, we have to preserve
90 * the CWP field, otherwise window save/restore explodes.
91 */
92 if (regs->psr != gdb_regs[GDB_PSR]) {
93 unsigned long cwp = regs->psr & PSR_CWP;
94
95 regs->psr = (gdb_regs[GDB_PSR] & ~PSR_CWP) | cwp;
96 }
97
98 regs->pc = gdb_regs[GDB_PC];
99 regs->npc = gdb_regs[GDB_NPC];
100 regs->y = gdb_regs[GDB_Y];
101
102 win = (struct reg_window32 *) regs->u_regs[UREG_FP];
103 for (i = 0; i < 8; i++)
104 win->locals[i] = gdb_regs[GDB_L0 + i];
105 for (i = 0; i < 8; i++)
106 win->ins[i] = gdb_regs[GDB_I0 + i];
107}
108
109int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
110 char *remcomInBuffer, char *remcomOutBuffer,
111 struct pt_regs *linux_regs)
112{
113 unsigned long addr;
114 char *ptr;
115
116 switch (remcomInBuffer[0]) {
117 case 'c':
118 /* try to read optional parameter, pc unchanged if no parm */
119 ptr = &remcomInBuffer[1];
120 if (kgdb_hex2long(&ptr, &addr)) {
121 linux_regs->pc = addr;
122 linux_regs->npc = addr + 4;
123 }
124 /* fallthru */
125
126 case 'D':
127 case 'k':
128 if (linux_regs->pc == (unsigned long) arch_kgdb_breakpoint) {
129 linux_regs->pc = linux_regs->npc;
130 linux_regs->npc += 4;
131 }
132 return 0;
133 }
134 return -1;
135}
136
137asmlinkage void kgdb_trap(unsigned long trap_level, struct pt_regs *regs)
138{
139 unsigned long flags;
140
141 if (user_mode(regs)) {
142 do_hw_interrupt(regs, trap_level);
143 return;
144 }
145
146 flushw_all();
147
148 local_irq_save(flags);
149 kgdb_handle_exception(trap_level, SIGTRAP, 0, regs);
150 local_irq_restore(flags);
151}
152
153int kgdb_arch_init(void)
154{
155 return 0;
156}
157
158void kgdb_arch_exit(void)
159{
160}
161
162void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
163{
164 regs->pc = ip;
165 regs->npc = regs->pc + 4;
166}
167
168struct kgdb_arch arch_kgdb_ops = {
169 /* Breakpoint instruction: ta 0x7d */
170 .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x7d },
171};
1/* kgdb.c: KGDB support for 32-bit sparc.
2 *
3 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
4 */
5
6#include <linux/kgdb.h>
7#include <linux/kdebug.h>
8
9#include <asm/kdebug.h>
10#include <asm/ptrace.h>
11#include <asm/irq.h>
12
13extern unsigned long trapbase;
14
15void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
16{
17 struct reg_window32 *win;
18 int i;
19
20 gdb_regs[GDB_G0] = 0;
21 for (i = 0; i < 15; i++)
22 gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i];
23
24 win = (struct reg_window32 *) regs->u_regs[UREG_FP];
25 for (i = 0; i < 8; i++)
26 gdb_regs[GDB_L0 + i] = win->locals[i];
27 for (i = 0; i < 8; i++)
28 gdb_regs[GDB_I0 + i] = win->ins[i];
29
30 for (i = GDB_F0; i <= GDB_F31; i++)
31 gdb_regs[i] = 0;
32
33 gdb_regs[GDB_Y] = regs->y;
34 gdb_regs[GDB_PSR] = regs->psr;
35 gdb_regs[GDB_WIM] = 0;
36 gdb_regs[GDB_TBR] = (unsigned long) &trapbase;
37 gdb_regs[GDB_PC] = regs->pc;
38 gdb_regs[GDB_NPC] = regs->npc;
39 gdb_regs[GDB_FSR] = 0;
40 gdb_regs[GDB_CSR] = 0;
41}
42
43void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
44{
45 struct thread_info *t = task_thread_info(p);
46 struct reg_window32 *win;
47 int i;
48
49 for (i = GDB_G0; i < GDB_G6; i++)
50 gdb_regs[i] = 0;
51 gdb_regs[GDB_G6] = (unsigned long) t;
52 gdb_regs[GDB_G7] = 0;
53 for (i = GDB_O0; i < GDB_SP; i++)
54 gdb_regs[i] = 0;
55 gdb_regs[GDB_SP] = t->ksp;
56 gdb_regs[GDB_O7] = 0;
57
58 win = (struct reg_window32 *) t->ksp;
59 for (i = 0; i < 8; i++)
60 gdb_regs[GDB_L0 + i] = win->locals[i];
61 for (i = 0; i < 8; i++)
62 gdb_regs[GDB_I0 + i] = win->ins[i];
63
64 for (i = GDB_F0; i <= GDB_F31; i++)
65 gdb_regs[i] = 0;
66
67 gdb_regs[GDB_Y] = 0;
68
69 gdb_regs[GDB_PSR] = t->kpsr;
70 gdb_regs[GDB_WIM] = t->kwim;
71 gdb_regs[GDB_TBR] = (unsigned long) &trapbase;
72 gdb_regs[GDB_PC] = t->kpc;
73 gdb_regs[GDB_NPC] = t->kpc + 4;
74 gdb_regs[GDB_FSR] = 0;
75 gdb_regs[GDB_CSR] = 0;
76}
77
78void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
79{
80 struct reg_window32 *win;
81 int i;
82
83 for (i = 0; i < 15; i++)
84 regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i];
85
86 /* If the PSR register is changing, we have to preserve
87 * the CWP field, otherwise window save/restore explodes.
88 */
89 if (regs->psr != gdb_regs[GDB_PSR]) {
90 unsigned long cwp = regs->psr & PSR_CWP;
91
92 regs->psr = (gdb_regs[GDB_PSR] & ~PSR_CWP) | cwp;
93 }
94
95 regs->pc = gdb_regs[GDB_PC];
96 regs->npc = gdb_regs[GDB_NPC];
97 regs->y = gdb_regs[GDB_Y];
98
99 win = (struct reg_window32 *) regs->u_regs[UREG_FP];
100 for (i = 0; i < 8; i++)
101 win->locals[i] = gdb_regs[GDB_L0 + i];
102 for (i = 0; i < 8; i++)
103 win->ins[i] = gdb_regs[GDB_I0 + i];
104}
105
106int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
107 char *remcomInBuffer, char *remcomOutBuffer,
108 struct pt_regs *linux_regs)
109{
110 unsigned long addr;
111 char *ptr;
112
113 switch (remcomInBuffer[0]) {
114 case 'c':
115 /* try to read optional parameter, pc unchanged if no parm */
116 ptr = &remcomInBuffer[1];
117 if (kgdb_hex2long(&ptr, &addr)) {
118 linux_regs->pc = addr;
119 linux_regs->npc = addr + 4;
120 }
121 /* fallthru */
122
123 case 'D':
124 case 'k':
125 if (linux_regs->pc == (unsigned long) arch_kgdb_breakpoint) {
126 linux_regs->pc = linux_regs->npc;
127 linux_regs->npc += 4;
128 }
129 return 0;
130 }
131 return -1;
132}
133
134extern void do_hw_interrupt(struct pt_regs *regs, unsigned long type);
135
136asmlinkage void kgdb_trap(struct pt_regs *regs)
137{
138 unsigned long flags;
139
140 if (user_mode(regs)) {
141 do_hw_interrupt(regs, 0xfd);
142 return;
143 }
144
145 flushw_all();
146
147 local_irq_save(flags);
148 kgdb_handle_exception(0x172, SIGTRAP, 0, regs);
149 local_irq_restore(flags);
150}
151
152int kgdb_arch_init(void)
153{
154 return 0;
155}
156
157void kgdb_arch_exit(void)
158{
159}
160
161void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
162{
163 regs->pc = ip;
164 regs->npc = regs->pc + 4;
165}
166
167struct kgdb_arch arch_kgdb_ops = {
168 /* Breakpoint instruction: ta 0x7d */
169 .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x7d },
170};