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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#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
15extern unsigned long trapbase;
16
17void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
18{
19 struct reg_window32 *win;
20 int i;
21
22 gdb_regs[GDB_G0] = 0;
23 for (i = 0; i < 15; i++)
24 gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i];
25
26 win = (struct reg_window32 *) regs->u_regs[UREG_FP];
27 for (i = 0; i < 8; i++)
28 gdb_regs[GDB_L0 + i] = win->locals[i];
29 for (i = 0; i < 8; i++)
30 gdb_regs[GDB_I0 + i] = win->ins[i];
31
32 for (i = GDB_F0; i <= GDB_F31; i++)
33 gdb_regs[i] = 0;
34
35 gdb_regs[GDB_Y] = regs->y;
36 gdb_regs[GDB_PSR] = regs->psr;
37 gdb_regs[GDB_WIM] = 0;
38 gdb_regs[GDB_TBR] = (unsigned long) &trapbase;
39 gdb_regs[GDB_PC] = regs->pc;
40 gdb_regs[GDB_NPC] = regs->npc;
41 gdb_regs[GDB_FSR] = 0;
42 gdb_regs[GDB_CSR] = 0;
43}
44
45void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
46{
47 struct thread_info *t = task_thread_info(p);
48 struct reg_window32 *win;
49 int i;
50
51 for (i = GDB_G0; i < GDB_G6; i++)
52 gdb_regs[i] = 0;
53 gdb_regs[GDB_G6] = (unsigned long) t;
54 gdb_regs[GDB_G7] = 0;
55 for (i = GDB_O0; i < GDB_SP; i++)
56 gdb_regs[i] = 0;
57 gdb_regs[GDB_SP] = t->ksp;
58 gdb_regs[GDB_O7] = 0;
59
60 win = (struct reg_window32 *) t->ksp;
61 for (i = 0; i < 8; i++)
62 gdb_regs[GDB_L0 + i] = win->locals[i];
63 for (i = 0; i < 8; i++)
64 gdb_regs[GDB_I0 + i] = win->ins[i];
65
66 for (i = GDB_F0; i <= GDB_F31; i++)
67 gdb_regs[i] = 0;
68
69 gdb_regs[GDB_Y] = 0;
70
71 gdb_regs[GDB_PSR] = t->kpsr;
72 gdb_regs[GDB_WIM] = t->kwim;
73 gdb_regs[GDB_TBR] = (unsigned long) &trapbase;
74 gdb_regs[GDB_PC] = t->kpc;
75 gdb_regs[GDB_NPC] = t->kpc + 4;
76 gdb_regs[GDB_FSR] = 0;
77 gdb_regs[GDB_CSR] = 0;
78}
79
80void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
81{
82 struct reg_window32 *win;
83 int i;
84
85 for (i = 0; i < 15; i++)
86 regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i];
87
88 /* If the PSR register is changing, we have to preserve
89 * the CWP field, otherwise window save/restore explodes.
90 */
91 if (regs->psr != gdb_regs[GDB_PSR]) {
92 unsigned long cwp = regs->psr & PSR_CWP;
93
94 regs->psr = (gdb_regs[GDB_PSR] & ~PSR_CWP) | cwp;
95 }
96
97 regs->pc = gdb_regs[GDB_PC];
98 regs->npc = gdb_regs[GDB_NPC];
99 regs->y = gdb_regs[GDB_Y];
100
101 win = (struct reg_window32 *) regs->u_regs[UREG_FP];
102 for (i = 0; i < 8; i++)
103 win->locals[i] = gdb_regs[GDB_L0 + i];
104 for (i = 0; i < 8; i++)
105 win->ins[i] = gdb_regs[GDB_I0 + i];
106}
107
108int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
109 char *remcomInBuffer, char *remcomOutBuffer,
110 struct pt_regs *linux_regs)
111{
112 unsigned long addr;
113 char *ptr;
114
115 switch (remcomInBuffer[0]) {
116 case 'c':
117 /* try to read optional parameter, pc unchanged if no parm */
118 ptr = &remcomInBuffer[1];
119 if (kgdb_hex2long(&ptr, &addr)) {
120 linux_regs->pc = addr;
121 linux_regs->npc = addr + 4;
122 }
123 /* fallthru */
124
125 case 'D':
126 case 'k':
127 if (linux_regs->pc == (unsigned long) arch_kgdb_breakpoint) {
128 linux_regs->pc = linux_regs->npc;
129 linux_regs->npc += 4;
130 }
131 return 0;
132 }
133 return -1;
134}
135
136extern void do_hw_interrupt(struct pt_regs *regs, unsigned long type);
137
138asmlinkage void kgdb_trap(struct pt_regs *regs)
139{
140 unsigned long flags;
141
142 if (user_mode(regs)) {
143 do_hw_interrupt(regs, 0xfd);
144 return;
145 }
146
147 flushw_all();
148
149 local_irq_save(flags);
150 kgdb_handle_exception(0x172, SIGTRAP, 0, regs);
151 local_irq_restore(flags);
152}
153
154int kgdb_arch_init(void)
155{
156 return 0;
157}
158
159void kgdb_arch_exit(void)
160{
161}
162
163void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
164{
165 regs->pc = ip;
166 regs->npc = regs->pc + 4;
167}
168
169struct kgdb_arch arch_kgdb_ops = {
170 /* Breakpoint instruction: ta 0x7d */
171 .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x7d },
172};