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-rw-r--r--arch/sparc64/kernel/kgdb.c186
1 files changed, 186 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/kgdb.c b/arch/sparc64/kernel/kgdb.c
new file mode 100644
index 000000000000..fefbe6dc51be
--- /dev/null
+++ b/arch/sparc64/kernel/kgdb.c
@@ -0,0 +1,186 @@
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
9#include <asm/kdebug.h>
10#include <asm/ptrace.h>
11#include <asm/irq.h>
12
13void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
14{
15 struct reg_window *win;
16 int i;
17
18 gdb_regs[GDB_G0] = 0;
19 for (i = 0; i < 15; i++)
20 gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i];
21
22 win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS);
23 for (i = 0; i < 8; i++)
24 gdb_regs[GDB_L0 + i] = win->locals[i];
25 for (i = 0; i < 8; i++)
26 gdb_regs[GDB_I0 + i] = win->ins[i];
27
28 for (i = GDB_F0; i <= GDB_F62; i++)
29 gdb_regs[i] = 0;
30
31 gdb_regs[GDB_PC] = regs->tpc;
32 gdb_regs[GDB_NPC] = regs->tnpc;
33 gdb_regs[GDB_STATE] = regs->tstate;
34 gdb_regs[GDB_FSR] = 0;
35 gdb_regs[GDB_FPRS] = 0;
36 gdb_regs[GDB_Y] = regs->y;
37}
38
39void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
40{
41 struct thread_info *t = task_thread_info(p);
42 extern unsigned int switch_to_pc;
43 extern unsigned int ret_from_syscall;
44 struct reg_window *win;
45 unsigned long pc, cwp;
46 int i;
47
48 for (i = GDB_G0; i < GDB_G6; i++)
49 gdb_regs[i] = 0;
50 gdb_regs[GDB_G6] = (unsigned long) t;
51 gdb_regs[GDB_G7] = (unsigned long) p;
52 for (i = GDB_O0; i < GDB_SP; i++)
53 gdb_regs[i] = 0;
54 gdb_regs[GDB_SP] = t->ksp;
55 gdb_regs[GDB_O7] = 0;
56
57 win = (struct reg_window *) (t->ksp + STACK_BIAS);
58 for (i = 0; i < 8; i++)
59 gdb_regs[GDB_L0 + i] = win->locals[i];
60 for (i = 0; i < 8; i++)
61 gdb_regs[GDB_I0 + i] = win->ins[i];
62
63 for (i = GDB_F0; i <= GDB_F62; i++)
64 gdb_regs[i] = 0;
65
66 if (t->new_child)
67 pc = (unsigned long) &ret_from_syscall;
68 else
69 pc = (unsigned long) &switch_to_pc;
70
71 gdb_regs[GDB_PC] = pc;
72 gdb_regs[GDB_NPC] = pc + 4;
73
74 cwp = __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP];
75
76 gdb_regs[GDB_STATE] = (TSTATE_PRIV | TSTATE_IE | cwp);
77 gdb_regs[GDB_FSR] = 0;
78 gdb_regs[GDB_FPRS] = 0;
79 gdb_regs[GDB_Y] = 0;
80}
81
82void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
83{
84 struct reg_window *win;
85 int i;
86
87 for (i = 0; i < 15; i++)
88 regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i];
89
90 /* If the TSTATE register is changing, we have to preserve
91 * the CWP field, otherwise window save/restore explodes.
92 */
93 if (regs->tstate != gdb_regs[GDB_STATE]) {
94 unsigned long cwp = regs->tstate & TSTATE_CWP;
95
96 regs->tstate = (gdb_regs[GDB_STATE] & ~TSTATE_CWP) | cwp;
97 }
98
99 regs->tpc = gdb_regs[GDB_PC];
100 regs->tnpc = gdb_regs[GDB_NPC];
101 regs->y = gdb_regs[GDB_Y];
102
103 win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS);
104 for (i = 0; i < 8; i++)
105 win->locals[i] = gdb_regs[GDB_L0 + i];
106 for (i = 0; i < 8; i++)
107 win->ins[i] = gdb_regs[GDB_I0 + i];
108}
109
110#ifdef CONFIG_SMP
111void smp_kgdb_capture_client(struct pt_regs *regs)
112{
113 unsigned long flags;
114
115 __asm__ __volatile__("rdpr %%pstate, %0\n\t"
116 "wrpr %0, %1, %%pstate"
117 : "=r" (flags)
118 : "i" (PSTATE_IE));
119
120 flushw_all();
121
122 if (atomic_read(&kgdb_active) != -1)
123 kgdb_nmicallback(raw_smp_processor_id(), regs);
124
125 __asm__ __volatile__("wrpr %0, 0, %%pstate"
126 : : "r" (flags));
127}
128#endif
129
130int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
131 char *remcomInBuffer, char *remcomOutBuffer,
132 struct pt_regs *linux_regs)
133{
134 unsigned long addr;
135 char *ptr;
136
137 switch (remcomInBuffer[0]) {
138 case 'c':
139 /* try to read optional parameter, pc unchanged if no parm */
140 ptr = &remcomInBuffer[1];
141 if (kgdb_hex2long(&ptr, &addr)) {
142 linux_regs->tpc = addr;
143 linux_regs->tnpc = addr + 4;
144 }
145 /* fallthru */
146
147 case 'D':
148 case 'k':
149 if (linux_regs->tpc == (unsigned long) arch_kgdb_breakpoint) {
150 linux_regs->tpc = linux_regs->tnpc;
151 linux_regs->tnpc += 4;
152 }
153 return 0;
154 }
155 return -1;
156}
157
158asmlinkage void kgdb_trap(unsigned long trap_level, struct pt_regs *regs)
159{
160 unsigned long flags;
161
162 if (user_mode(regs)) {
163 bad_trap(regs, trap_level);
164 return;
165 }
166
167 flushw_all();
168
169 local_irq_save(flags);
170 kgdb_handle_exception(0x172, SIGTRAP, 0, regs);
171 local_irq_restore(flags);
172}
173
174int kgdb_arch_init(void)
175{
176 return 0;
177}
178
179void kgdb_arch_exit(void)
180{
181}
182
183struct kgdb_arch arch_kgdb_ops = {
184 /* Breakpoint instruction: ta 0x72 */
185 .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x72 },
186};