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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> |
e2fdd7fd DM |
9 | |
10 | #include <asm/kdebug.h> | |
11 | #include <asm/ptrace.h> | |
12 | #include <asm/irq.h> | |
13 | ||
14 | void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs) | |
15 | { | |
16 | struct reg_window *win; | |
17 | int i; | |
18 | ||
19 | gdb_regs[GDB_G0] = 0; | |
20 | for (i = 0; i < 15; i++) | |
21 | gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i]; | |
22 | ||
23 | win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS); | |
24 | for (i = 0; i < 8; i++) | |
25 | gdb_regs[GDB_L0 + i] = win->locals[i]; | |
26 | for (i = 0; i < 8; i++) | |
27 | gdb_regs[GDB_I0 + i] = win->ins[i]; | |
28 | ||
29 | for (i = GDB_F0; i <= GDB_F62; i++) | |
30 | gdb_regs[i] = 0; | |
31 | ||
32 | gdb_regs[GDB_PC] = regs->tpc; | |
33 | gdb_regs[GDB_NPC] = regs->tnpc; | |
34 | gdb_regs[GDB_STATE] = regs->tstate; | |
35 | gdb_regs[GDB_FSR] = 0; | |
36 | gdb_regs[GDB_FPRS] = 0; | |
37 | gdb_regs[GDB_Y] = regs->y; | |
38 | } | |
39 | ||
40 | void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) | |
41 | { | |
42 | struct thread_info *t = task_thread_info(p); | |
43 | extern unsigned int switch_to_pc; | |
44 | extern unsigned int ret_from_syscall; | |
45 | struct reg_window *win; | |
46 | unsigned long pc, cwp; | |
47 | int i; | |
48 | ||
49 | for (i = GDB_G0; i < GDB_G6; i++) | |
50 | gdb_regs[i] = 0; | |
51 | gdb_regs[GDB_G6] = (unsigned long) t; | |
52 | gdb_regs[GDB_G7] = (unsigned long) p; | |
53 | for (i = GDB_O0; i < GDB_SP; i++) | |
54 | gdb_regs[i] = 0; | |
55 | gdb_regs[GDB_SP] = t->ksp; | |
56 | gdb_regs[GDB_O7] = 0; | |
57 | ||
58 | win = (struct reg_window *) (t->ksp + STACK_BIAS); | |
59 | for (i = 0; i < 8; i++) | |
60 | gdb_regs[GDB_L0 + i] = win->locals[i]; | |
61 | for (i = 0; i < 8; i++) | |
62 | gdb_regs[GDB_I0 + i] = win->ins[i]; | |
63 | ||
64 | for (i = GDB_F0; i <= GDB_F62; i++) | |
65 | gdb_regs[i] = 0; | |
66 | ||
67 | if (t->new_child) | |
68 | pc = (unsigned long) &ret_from_syscall; | |
69 | else | |
70 | pc = (unsigned long) &switch_to_pc; | |
71 | ||
72 | gdb_regs[GDB_PC] = pc; | |
73 | gdb_regs[GDB_NPC] = pc + 4; | |
74 | ||
75 | cwp = __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP]; | |
76 | ||
77 | gdb_regs[GDB_STATE] = (TSTATE_PRIV | TSTATE_IE | cwp); | |
78 | gdb_regs[GDB_FSR] = 0; | |
79 | gdb_regs[GDB_FPRS] = 0; | |
80 | gdb_regs[GDB_Y] = 0; | |
81 | } | |
82 | ||
83 | void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs) | |
84 | { | |
85 | struct reg_window *win; | |
86 | int i; | |
87 | ||
88 | for (i = 0; i < 15; i++) | |
89 | regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i]; | |
90 | ||
91 | /* If the TSTATE register is changing, we have to preserve | |
92 | * the CWP field, otherwise window save/restore explodes. | |
93 | */ | |
94 | if (regs->tstate != gdb_regs[GDB_STATE]) { | |
95 | unsigned long cwp = regs->tstate & TSTATE_CWP; | |
96 | ||
97 | regs->tstate = (gdb_regs[GDB_STATE] & ~TSTATE_CWP) | cwp; | |
98 | } | |
99 | ||
100 | regs->tpc = gdb_regs[GDB_PC]; | |
101 | regs->tnpc = gdb_regs[GDB_NPC]; | |
102 | regs->y = gdb_regs[GDB_Y]; | |
103 | ||
104 | win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS); | |
105 | for (i = 0; i < 8; i++) | |
106 | win->locals[i] = gdb_regs[GDB_L0 + i]; | |
107 | for (i = 0; i < 8; i++) | |
108 | win->ins[i] = gdb_regs[GDB_I0 + i]; | |
109 | } | |
110 | ||
111 | #ifdef CONFIG_SMP | |
9960e9e8 | 112 | void __irq_entry smp_kgdb_capture_client(int irq, struct pt_regs *regs) |
e2fdd7fd DM |
113 | { |
114 | unsigned long flags; | |
115 | ||
116 | __asm__ __volatile__("rdpr %%pstate, %0\n\t" | |
117 | "wrpr %0, %1, %%pstate" | |
118 | : "=r" (flags) | |
119 | : "i" (PSTATE_IE)); | |
120 | ||
121 | flushw_all(); | |
122 | ||
123 | if (atomic_read(&kgdb_active) != -1) | |
124 | kgdb_nmicallback(raw_smp_processor_id(), regs); | |
125 | ||
126 | __asm__ __volatile__("wrpr %0, 0, %%pstate" | |
127 | : : "r" (flags)); | |
128 | } | |
129 | #endif | |
130 | ||
131 | int kgdb_arch_handle_exception(int e_vector, int signo, int err_code, | |
132 | char *remcomInBuffer, char *remcomOutBuffer, | |
133 | struct pt_regs *linux_regs) | |
134 | { | |
135 | unsigned long addr; | |
136 | char *ptr; | |
137 | ||
138 | switch (remcomInBuffer[0]) { | |
139 | case 'c': | |
140 | /* try to read optional parameter, pc unchanged if no parm */ | |
141 | ptr = &remcomInBuffer[1]; | |
142 | if (kgdb_hex2long(&ptr, &addr)) { | |
143 | linux_regs->tpc = addr; | |
144 | linux_regs->tnpc = addr + 4; | |
145 | } | |
146 | /* fallthru */ | |
147 | ||
148 | case 'D': | |
149 | case 'k': | |
150 | if (linux_regs->tpc == (unsigned long) arch_kgdb_breakpoint) { | |
151 | linux_regs->tpc = linux_regs->tnpc; | |
152 | linux_regs->tnpc += 4; | |
153 | } | |
154 | return 0; | |
155 | } | |
156 | return -1; | |
157 | } | |
158 | ||
159 | asmlinkage void kgdb_trap(unsigned long trap_level, struct pt_regs *regs) | |
160 | { | |
161 | unsigned long flags; | |
162 | ||
163 | if (user_mode(regs)) { | |
164 | bad_trap(regs, trap_level); | |
165 | return; | |
166 | } | |
167 | ||
168 | flushw_all(); | |
169 | ||
170 | local_irq_save(flags); | |
171 | kgdb_handle_exception(0x172, SIGTRAP, 0, regs); | |
172 | local_irq_restore(flags); | |
173 | } | |
174 | ||
175 | int kgdb_arch_init(void) | |
176 | { | |
177 | return 0; | |
178 | } | |
179 | ||
180 | void kgdb_arch_exit(void) | |
181 | { | |
182 | } | |
183 | ||
c75fbb05 JW |
184 | void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip) |
185 | { | |
186 | regs->tpc = ip; | |
187 | regs->tnpc = regs->tpc + 4; | |
188 | } | |
189 | ||
e2fdd7fd DM |
190 | struct kgdb_arch arch_kgdb_ops = { |
191 | /* Breakpoint instruction: ta 0x72 */ | |
192 | .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x72 }, | |
193 | }; |