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1/* kgdb.c: KGDB support for 64-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/ftrace.h>
9
10#include <asm/cacheflush.h>
11#include <asm/kdebug.h>
12#include <asm/ptrace.h>
13#include <asm/irq.h>
14
15void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
16{
17 struct reg_window *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_window *) (regs->u_regs[UREG_FP] + STACK_BIAS);
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_F62; i++)
31 gdb_regs[i] = 0;
32
33 gdb_regs[GDB_PC] = regs->tpc;
34 gdb_regs[GDB_NPC] = regs->tnpc;
35 gdb_regs[GDB_STATE] = regs->tstate;
36 gdb_regs[GDB_FSR] = 0;
37 gdb_regs[GDB_FPRS] = 0;
38 gdb_regs[GDB_Y] = regs->y;
39}
40
41void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
42{
43 struct thread_info *t = task_thread_info(p);
44 extern unsigned int switch_to_pc;
45 extern unsigned int ret_from_syscall;
46 struct reg_window *win;
47 unsigned long pc, cwp;
48 int i;
49
50 for (i = GDB_G0; i < GDB_G6; i++)
51 gdb_regs[i] = 0;
52 gdb_regs[GDB_G6] = (unsigned long) t;
53 gdb_regs[GDB_G7] = (unsigned long) p;
54 for (i = GDB_O0; i < GDB_SP; i++)
55 gdb_regs[i] = 0;
56 gdb_regs[GDB_SP] = t->ksp;
57 gdb_regs[GDB_O7] = 0;
58
59 win = (struct reg_window *) (t->ksp + STACK_BIAS);
60 for (i = 0; i < 8; i++)
61 gdb_regs[GDB_L0 + i] = win->locals[i];
62 for (i = 0; i < 8; i++)
63 gdb_regs[GDB_I0 + i] = win->ins[i];
64
65 for (i = GDB_F0; i <= GDB_F62; i++)
66 gdb_regs[i] = 0;
67
68 if (t->new_child)
69 pc = (unsigned long) &ret_from_syscall;
70 else
71 pc = (unsigned long) &switch_to_pc;
72
73 gdb_regs[GDB_PC] = pc;
74 gdb_regs[GDB_NPC] = pc + 4;
75
76 cwp = __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP];
77
78 gdb_regs[GDB_STATE] = (TSTATE_PRIV | TSTATE_IE | cwp);
79 gdb_regs[GDB_FSR] = 0;
80 gdb_regs[GDB_FPRS] = 0;
81 gdb_regs[GDB_Y] = 0;
82}
83
84void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
85{
86 struct reg_window *win;
87 int i;
88
89 for (i = 0; i < 15; i++)
90 regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i];
91
92 /* If the TSTATE register is changing, we have to preserve
93 * the CWP field, otherwise window save/restore explodes.
94 */
95 if (regs->tstate != gdb_regs[GDB_STATE]) {
96 unsigned long cwp = regs->tstate & TSTATE_CWP;
97
98 regs->tstate = (gdb_regs[GDB_STATE] & ~TSTATE_CWP) | cwp;
99 }
100
101 regs->tpc = gdb_regs[GDB_PC];
102 regs->tnpc = gdb_regs[GDB_NPC];
103 regs->y = gdb_regs[GDB_Y];
104
105 win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS);
106 for (i = 0; i < 8; i++)
107 win->locals[i] = gdb_regs[GDB_L0 + i];
108 for (i = 0; i < 8; i++)
109 win->ins[i] = gdb_regs[GDB_I0 + i];
110}
111
112#ifdef CONFIG_SMP
113void __irq_entry smp_kgdb_capture_client(int irq, struct pt_regs *regs)
114{
115 unsigned long flags;
116
117 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
118 "wrpr %0, %1, %%pstate"
119 : "=r" (flags)
120 : "i" (PSTATE_IE));
121
122 flushw_all();
123
124 if (atomic_read(&kgdb_active) != -1)
125 kgdb_nmicallback(raw_smp_processor_id(), regs);
126
127 __asm__ __volatile__("wrpr %0, 0, %%pstate"
128 : : "r" (flags));
129}
130#endif
131
132int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
133 char *remcomInBuffer, char *remcomOutBuffer,
134 struct pt_regs *linux_regs)
135{
136 unsigned long addr;
137 char *ptr;
138
139 switch (remcomInBuffer[0]) {
140 case 'c':
141 /* try to read optional parameter, pc unchanged if no parm */
142 ptr = &remcomInBuffer[1];
143 if (kgdb_hex2long(&ptr, &addr)) {
144 linux_regs->tpc = addr;
145 linux_regs->tnpc = addr + 4;
146 }
147 /* fallthru */
148
149 case 'D':
150 case 'k':
151 if (linux_regs->tpc == (unsigned long) arch_kgdb_breakpoint) {
152 linux_regs->tpc = linux_regs->tnpc;
153 linux_regs->tnpc += 4;
154 }
155 return 0;
156 }
157 return -1;
158}
159
160asmlinkage void kgdb_trap(unsigned long trap_level, struct pt_regs *regs)
161{
162 unsigned long flags;
163
164 if (user_mode(regs)) {
165 bad_trap(regs, trap_level);
166 return;
167 }
168
169 flushw_all();
170
171 local_irq_save(flags);
172 kgdb_handle_exception(0x172, SIGTRAP, 0, regs);
173 local_irq_restore(flags);
174}
175
176int kgdb_arch_init(void)
177{
178 return 0;
179}
180
181void kgdb_arch_exit(void)
182{
183}
184
185void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
186{
187 regs->tpc = ip;
188 regs->tnpc = regs->tpc + 4;
189}
190
191struct kgdb_arch arch_kgdb_ops = {
192 /* Breakpoint instruction: ta 0x72 */
193 .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x72 },
194};
1/* kgdb.c: KGDB support for 64-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/ftrace.h>
9#include <linux/context_tracking.h>
10
11#include <asm/cacheflush.h>
12#include <asm/kdebug.h>
13#include <asm/ptrace.h>
14#include <asm/irq.h>
15
16void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
17{
18 struct reg_window *win;
19 int i;
20
21 gdb_regs[GDB_G0] = 0;
22 for (i = 0; i < 15; i++)
23 gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i];
24
25 win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS);
26 for (i = 0; i < 8; i++)
27 gdb_regs[GDB_L0 + i] = win->locals[i];
28 for (i = 0; i < 8; i++)
29 gdb_regs[GDB_I0 + i] = win->ins[i];
30
31 for (i = GDB_F0; i <= GDB_F62; i++)
32 gdb_regs[i] = 0;
33
34 gdb_regs[GDB_PC] = regs->tpc;
35 gdb_regs[GDB_NPC] = regs->tnpc;
36 gdb_regs[GDB_STATE] = regs->tstate;
37 gdb_regs[GDB_FSR] = 0;
38 gdb_regs[GDB_FPRS] = 0;
39 gdb_regs[GDB_Y] = regs->y;
40}
41
42void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
43{
44 struct thread_info *t = task_thread_info(p);
45 extern unsigned int switch_to_pc;
46 extern unsigned int ret_from_fork;
47 struct reg_window *win;
48 unsigned long pc, cwp;
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] = (unsigned long) p;
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_window *) (t->ksp + STACK_BIAS);
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_F62; i++)
67 gdb_regs[i] = 0;
68
69 if (t->new_child)
70 pc = (unsigned long) &ret_from_fork;
71 else
72 pc = (unsigned long) &switch_to_pc;
73
74 gdb_regs[GDB_PC] = pc;
75 gdb_regs[GDB_NPC] = pc + 4;
76
77 cwp = __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP];
78
79 gdb_regs[GDB_STATE] = (TSTATE_PRIV | TSTATE_IE | cwp);
80 gdb_regs[GDB_FSR] = 0;
81 gdb_regs[GDB_FPRS] = 0;
82 gdb_regs[GDB_Y] = 0;
83}
84
85void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
86{
87 struct reg_window *win;
88 int i;
89
90 for (i = 0; i < 15; i++)
91 regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i];
92
93 /* If the TSTATE register is changing, we have to preserve
94 * the CWP field, otherwise window save/restore explodes.
95 */
96 if (regs->tstate != gdb_regs[GDB_STATE]) {
97 unsigned long cwp = regs->tstate & TSTATE_CWP;
98
99 regs->tstate = (gdb_regs[GDB_STATE] & ~TSTATE_CWP) | cwp;
100 }
101
102 regs->tpc = gdb_regs[GDB_PC];
103 regs->tnpc = gdb_regs[GDB_NPC];
104 regs->y = gdb_regs[GDB_Y];
105
106 win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS);
107 for (i = 0; i < 8; i++)
108 win->locals[i] = gdb_regs[GDB_L0 + i];
109 for (i = 0; i < 8; i++)
110 win->ins[i] = gdb_regs[GDB_I0 + i];
111}
112
113#ifdef CONFIG_SMP
114void __irq_entry smp_kgdb_capture_client(int irq, struct pt_regs *regs)
115{
116 unsigned long flags;
117
118 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
119 "wrpr %0, %1, %%pstate"
120 : "=r" (flags)
121 : "i" (PSTATE_IE));
122
123 flushw_all();
124
125 if (atomic_read(&kgdb_active) != -1)
126 kgdb_nmicallback(raw_smp_processor_id(), regs);
127
128 __asm__ __volatile__("wrpr %0, 0, %%pstate"
129 : : "r" (flags));
130}
131#endif
132
133int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
134 char *remcomInBuffer, char *remcomOutBuffer,
135 struct pt_regs *linux_regs)
136{
137 unsigned long addr;
138 char *ptr;
139
140 switch (remcomInBuffer[0]) {
141 case 'c':
142 /* try to read optional parameter, pc unchanged if no parm */
143 ptr = &remcomInBuffer[1];
144 if (kgdb_hex2long(&ptr, &addr)) {
145 linux_regs->tpc = addr;
146 linux_regs->tnpc = addr + 4;
147 }
148 /* fallthru */
149
150 case 'D':
151 case 'k':
152 if (linux_regs->tpc == (unsigned long) arch_kgdb_breakpoint) {
153 linux_regs->tpc = linux_regs->tnpc;
154 linux_regs->tnpc += 4;
155 }
156 return 0;
157 }
158 return -1;
159}
160
161asmlinkage void kgdb_trap(unsigned long trap_level, struct pt_regs *regs)
162{
163 enum ctx_state prev_state = exception_enter();
164 unsigned long flags;
165
166 if (user_mode(regs)) {
167 bad_trap(regs, trap_level);
168 goto out;
169 }
170
171 flushw_all();
172
173 local_irq_save(flags);
174 kgdb_handle_exception(0x172, SIGTRAP, 0, regs);
175 local_irq_restore(flags);
176out:
177 exception_exit(prev_state);
178}
179
180int kgdb_arch_init(void)
181{
182 return 0;
183}
184
185void kgdb_arch_exit(void)
186{
187}
188
189void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
190{
191 regs->tpc = ip;
192 regs->tnpc = regs->tpc + 4;
193}
194
195struct kgdb_arch arch_kgdb_ops = {
196 /* Breakpoint instruction: ta 0x72 */
197 .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x72 },
198};