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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> | |
8 | ||
9 | #include <asm/kdebug.h> | |
10 | #include <asm/ptrace.h> | |
11 | #include <asm/irq.h> | |
12 | ||
13 | void 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 | ||
39 | void 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 | ||
82 | void 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 | |
111 | void 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 | ||
130 | int 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 | ||
158 | asmlinkage 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 | ||
174 | int kgdb_arch_init(void) | |
175 | { | |
176 | return 0; | |
177 | } | |
178 | ||
179 | void kgdb_arch_exit(void) | |
180 | { | |
181 | } | |
182 | ||
183 | struct kgdb_arch arch_kgdb_ops = { | |
184 | /* Breakpoint instruction: ta 0x72 */ | |
185 | .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x72 }, | |
186 | }; |