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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
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};
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};