Loading...
1// SPDX-License-Identifier: GPL-2.0
2/* kgdb.c: KGDB support for 64-bit sparc.
3 *
4 * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
5 */
6
7#include <linux/kgdb.h>
8#include <linux/kdebug.h>
9#include <linux/ftrace.h>
10#include <linux/context_tracking.h>
11
12#include <asm/cacheflush.h>
13#include <asm/kdebug.h>
14#include <asm/ptrace.h>
15#include <asm/irq.h>
16
17#include "kernel.h"
18
19void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
20{
21 struct reg_window *win;
22 int i;
23
24 gdb_regs[GDB_G0] = 0;
25 for (i = 0; i < 15; i++)
26 gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i];
27
28 win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS);
29 for (i = 0; i < 8; i++)
30 gdb_regs[GDB_L0 + i] = win->locals[i];
31 for (i = 0; i < 8; i++)
32 gdb_regs[GDB_I0 + i] = win->ins[i];
33
34 for (i = GDB_F0; i <= GDB_F62; i++)
35 gdb_regs[i] = 0;
36
37 gdb_regs[GDB_PC] = regs->tpc;
38 gdb_regs[GDB_NPC] = regs->tnpc;
39 gdb_regs[GDB_STATE] = regs->tstate;
40 gdb_regs[GDB_FSR] = 0;
41 gdb_regs[GDB_FPRS] = 0;
42 gdb_regs[GDB_Y] = regs->y;
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 extern unsigned int switch_to_pc;
49 extern unsigned int ret_from_fork;
50 struct reg_window *win;
51 unsigned long pc, cwp;
52 int i;
53
54 for (i = GDB_G0; i < GDB_G6; i++)
55 gdb_regs[i] = 0;
56 gdb_regs[GDB_G6] = (unsigned long) t;
57 gdb_regs[GDB_G7] = (unsigned long) p;
58 for (i = GDB_O0; i < GDB_SP; i++)
59 gdb_regs[i] = 0;
60 gdb_regs[GDB_SP] = t->ksp;
61 gdb_regs[GDB_O7] = 0;
62
63 win = (struct reg_window *) (t->ksp + STACK_BIAS);
64 for (i = 0; i < 8; i++)
65 gdb_regs[GDB_L0 + i] = win->locals[i];
66 for (i = 0; i < 8; i++)
67 gdb_regs[GDB_I0 + i] = win->ins[i];
68
69 for (i = GDB_F0; i <= GDB_F62; i++)
70 gdb_regs[i] = 0;
71
72 if (t->new_child)
73 pc = (unsigned long) &ret_from_fork;
74 else
75 pc = (unsigned long) &switch_to_pc;
76
77 gdb_regs[GDB_PC] = pc;
78 gdb_regs[GDB_NPC] = pc + 4;
79
80 cwp = __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP];
81
82 gdb_regs[GDB_STATE] = (TSTATE_PRIV | TSTATE_IE | cwp);
83 gdb_regs[GDB_FSR] = 0;
84 gdb_regs[GDB_FPRS] = 0;
85 gdb_regs[GDB_Y] = 0;
86}
87
88void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
89{
90 struct reg_window *win;
91 int i;
92
93 for (i = 0; i < 15; i++)
94 regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i];
95
96 /* If the TSTATE register is changing, we have to preserve
97 * the CWP field, otherwise window save/restore explodes.
98 */
99 if (regs->tstate != gdb_regs[GDB_STATE]) {
100 unsigned long cwp = regs->tstate & TSTATE_CWP;
101
102 regs->tstate = (gdb_regs[GDB_STATE] & ~TSTATE_CWP) | cwp;
103 }
104
105 regs->tpc = gdb_regs[GDB_PC];
106 regs->tnpc = gdb_regs[GDB_NPC];
107 regs->y = gdb_regs[GDB_Y];
108
109 win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS);
110 for (i = 0; i < 8; i++)
111 win->locals[i] = gdb_regs[GDB_L0 + i];
112 for (i = 0; i < 8; i++)
113 win->ins[i] = gdb_regs[GDB_I0 + i];
114}
115
116#ifdef CONFIG_SMP
117void __irq_entry smp_kgdb_capture_client(int irq, struct pt_regs *regs)
118{
119 unsigned long flags;
120
121 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
122 "wrpr %0, %1, %%pstate"
123 : "=r" (flags)
124 : "i" (PSTATE_IE));
125
126 flushw_all();
127
128 if (atomic_read(&kgdb_active) != -1)
129 kgdb_nmicallback(raw_smp_processor_id(), regs);
130
131 __asm__ __volatile__("wrpr %0, 0, %%pstate"
132 : : "r" (flags));
133}
134#endif
135
136int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
137 char *remcomInBuffer, char *remcomOutBuffer,
138 struct pt_regs *linux_regs)
139{
140 unsigned long addr;
141 char *ptr;
142
143 switch (remcomInBuffer[0]) {
144 case 'c':
145 /* try to read optional parameter, pc unchanged if no parm */
146 ptr = &remcomInBuffer[1];
147 if (kgdb_hex2long(&ptr, &addr)) {
148 linux_regs->tpc = addr;
149 linux_regs->tnpc = addr + 4;
150 }
151 fallthrough;
152
153 case 'D':
154 case 'k':
155 if (linux_regs->tpc == (unsigned long) arch_kgdb_breakpoint) {
156 linux_regs->tpc = linux_regs->tnpc;
157 linux_regs->tnpc += 4;
158 }
159 return 0;
160 }
161 return -1;
162}
163
164asmlinkage void kgdb_trap(unsigned long trap_level, struct pt_regs *regs)
165{
166 enum ctx_state prev_state = exception_enter();
167 unsigned long flags;
168
169 if (user_mode(regs)) {
170 bad_trap(regs, trap_level);
171 goto out;
172 }
173
174 flushw_all();
175
176 local_irq_save(flags);
177 kgdb_handle_exception(0x172, SIGTRAP, 0, regs);
178 local_irq_restore(flags);
179out:
180 exception_exit(prev_state);
181}
182
183int kgdb_arch_init(void)
184{
185 return 0;
186}
187
188void kgdb_arch_exit(void)
189{
190}
191
192void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
193{
194 regs->tpc = ip;
195 regs->tnpc = regs->tpc + 4;
196}
197
198const struct kgdb_arch arch_kgdb_ops = {
199 /* Breakpoint instruction: ta 0x72 */
200 .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x72 },
201};
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
16#include "kernel.h"
17
18void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
19{
20 struct reg_window *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_window *) (regs->u_regs[UREG_FP] + STACK_BIAS);
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_F62; i++)
34 gdb_regs[i] = 0;
35
36 gdb_regs[GDB_PC] = regs->tpc;
37 gdb_regs[GDB_NPC] = regs->tnpc;
38 gdb_regs[GDB_STATE] = regs->tstate;
39 gdb_regs[GDB_FSR] = 0;
40 gdb_regs[GDB_FPRS] = 0;
41 gdb_regs[GDB_Y] = regs->y;
42}
43
44void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
45{
46 struct thread_info *t = task_thread_info(p);
47 extern unsigned int switch_to_pc;
48 extern unsigned int ret_from_fork;
49 struct reg_window *win;
50 unsigned long pc, cwp;
51 int i;
52
53 for (i = GDB_G0; i < GDB_G6; i++)
54 gdb_regs[i] = 0;
55 gdb_regs[GDB_G6] = (unsigned long) t;
56 gdb_regs[GDB_G7] = (unsigned long) p;
57 for (i = GDB_O0; i < GDB_SP; i++)
58 gdb_regs[i] = 0;
59 gdb_regs[GDB_SP] = t->ksp;
60 gdb_regs[GDB_O7] = 0;
61
62 win = (struct reg_window *) (t->ksp + STACK_BIAS);
63 for (i = 0; i < 8; i++)
64 gdb_regs[GDB_L0 + i] = win->locals[i];
65 for (i = 0; i < 8; i++)
66 gdb_regs[GDB_I0 + i] = win->ins[i];
67
68 for (i = GDB_F0; i <= GDB_F62; i++)
69 gdb_regs[i] = 0;
70
71 if (t->new_child)
72 pc = (unsigned long) &ret_from_fork;
73 else
74 pc = (unsigned long) &switch_to_pc;
75
76 gdb_regs[GDB_PC] = pc;
77 gdb_regs[GDB_NPC] = pc + 4;
78
79 cwp = __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP];
80
81 gdb_regs[GDB_STATE] = (TSTATE_PRIV | TSTATE_IE | cwp);
82 gdb_regs[GDB_FSR] = 0;
83 gdb_regs[GDB_FPRS] = 0;
84 gdb_regs[GDB_Y] = 0;
85}
86
87void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
88{
89 struct reg_window *win;
90 int i;
91
92 for (i = 0; i < 15; i++)
93 regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i];
94
95 /* If the TSTATE register is changing, we have to preserve
96 * the CWP field, otherwise window save/restore explodes.
97 */
98 if (regs->tstate != gdb_regs[GDB_STATE]) {
99 unsigned long cwp = regs->tstate & TSTATE_CWP;
100
101 regs->tstate = (gdb_regs[GDB_STATE] & ~TSTATE_CWP) | cwp;
102 }
103
104 regs->tpc = gdb_regs[GDB_PC];
105 regs->tnpc = gdb_regs[GDB_NPC];
106 regs->y = gdb_regs[GDB_Y];
107
108 win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS);
109 for (i = 0; i < 8; i++)
110 win->locals[i] = gdb_regs[GDB_L0 + i];
111 for (i = 0; i < 8; i++)
112 win->ins[i] = gdb_regs[GDB_I0 + i];
113}
114
115#ifdef CONFIG_SMP
116void __irq_entry smp_kgdb_capture_client(int irq, struct pt_regs *regs)
117{
118 unsigned long flags;
119
120 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
121 "wrpr %0, %1, %%pstate"
122 : "=r" (flags)
123 : "i" (PSTATE_IE));
124
125 flushw_all();
126
127 if (atomic_read(&kgdb_active) != -1)
128 kgdb_nmicallback(raw_smp_processor_id(), regs);
129
130 __asm__ __volatile__("wrpr %0, 0, %%pstate"
131 : : "r" (flags));
132}
133#endif
134
135int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
136 char *remcomInBuffer, char *remcomOutBuffer,
137 struct pt_regs *linux_regs)
138{
139 unsigned long addr;
140 char *ptr;
141
142 switch (remcomInBuffer[0]) {
143 case 'c':
144 /* try to read optional parameter, pc unchanged if no parm */
145 ptr = &remcomInBuffer[1];
146 if (kgdb_hex2long(&ptr, &addr)) {
147 linux_regs->tpc = addr;
148 linux_regs->tnpc = addr + 4;
149 }
150 /* fallthru */
151
152 case 'D':
153 case 'k':
154 if (linux_regs->tpc == (unsigned long) arch_kgdb_breakpoint) {
155 linux_regs->tpc = linux_regs->tnpc;
156 linux_regs->tnpc += 4;
157 }
158 return 0;
159 }
160 return -1;
161}
162
163asmlinkage void kgdb_trap(unsigned long trap_level, struct pt_regs *regs)
164{
165 enum ctx_state prev_state = exception_enter();
166 unsigned long flags;
167
168 if (user_mode(regs)) {
169 bad_trap(regs, trap_level);
170 goto out;
171 }
172
173 flushw_all();
174
175 local_irq_save(flags);
176 kgdb_handle_exception(0x172, SIGTRAP, 0, regs);
177 local_irq_restore(flags);
178out:
179 exception_exit(prev_state);
180}
181
182int kgdb_arch_init(void)
183{
184 return 0;
185}
186
187void kgdb_arch_exit(void)
188{
189}
190
191void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
192{
193 regs->tpc = ip;
194 regs->tnpc = regs->tpc + 4;
195}
196
197struct kgdb_arch arch_kgdb_ops = {
198 /* Breakpoint instruction: ta 0x72 */
199 .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x72 },
200};