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e2fdd7fd DM |
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> | |
9960e9e8 | 8 | #include <linux/ftrace.h> |
1de425c7 | 9 | #include <linux/context_tracking.h> |
e2fdd7fd | 10 | |
8befc9f2 | 11 | #include <asm/cacheflush.h> |
e2fdd7fd DM |
12 | #include <asm/kdebug.h> |
13 | #include <asm/ptrace.h> | |
14 | #include <asm/irq.h> | |
15 | ||
48c7eca5 SR |
16 | #include "kernel.h" |
17 | ||
e2fdd7fd DM |
18 | void 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 | ||
44 | void 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; | |
37d6fa34 | 48 | extern unsigned int ret_from_fork; |
e2fdd7fd DM |
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) | |
37d6fa34 | 72 | pc = (unsigned long) &ret_from_fork; |
e2fdd7fd DM |
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 | ||
87 | void 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 | |
9960e9e8 | 116 | void __irq_entry smp_kgdb_capture_client(int irq, struct pt_regs *regs) |
e2fdd7fd DM |
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 | ||
135 | int 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 | ||
163 | asmlinkage void kgdb_trap(unsigned long trap_level, struct pt_regs *regs) | |
164 | { | |
812cb83a | 165 | enum ctx_state prev_state = exception_enter(); |
e2fdd7fd DM |
166 | unsigned long flags; |
167 | ||
168 | if (user_mode(regs)) { | |
169 | bad_trap(regs, trap_level); | |
812cb83a | 170 | goto out; |
e2fdd7fd DM |
171 | } |
172 | ||
173 | flushw_all(); | |
174 | ||
175 | local_irq_save(flags); | |
176 | kgdb_handle_exception(0x172, SIGTRAP, 0, regs); | |
177 | local_irq_restore(flags); | |
812cb83a KT |
178 | out: |
179 | exception_exit(prev_state); | |
e2fdd7fd DM |
180 | } |
181 | ||
182 | int kgdb_arch_init(void) | |
183 | { | |
184 | return 0; | |
185 | } | |
186 | ||
187 | void kgdb_arch_exit(void) | |
188 | { | |
189 | } | |
190 | ||
c75fbb05 JW |
191 | void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip) |
192 | { | |
193 | regs->tpc = ip; | |
194 | regs->tnpc = regs->tpc + 4; | |
195 | } | |
196 | ||
e2fdd7fd DM |
197 | struct kgdb_arch arch_kgdb_ops = { |
198 | /* Breakpoint instruction: ta 0x72 */ | |
199 | .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x72 }, | |
200 | }; |