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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
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};