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1 | /* kgdb.c: KGDB support for 32-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 | extern unsigned long trapbase; |
14 | |
15 | void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs) |
16 | { |
17 | struct reg_window32 *win; |
18 | int i; |
19 | |
20 | gdb_regs[GDB_G0] = 0; |
21 | for (i = 0; i < 15; i++) |
22 | gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i]; |
23 | |
24 | win = (struct reg_window32 *) regs->u_regs[UREG_FP]; |
25 | for (i = 0; i < 8; i++) |
26 | gdb_regs[GDB_L0 + i] = win->locals[i]; |
27 | for (i = 0; i < 8; i++) |
28 | gdb_regs[GDB_I0 + i] = win->ins[i]; |
29 | |
30 | for (i = GDB_F0; i <= GDB_F31; i++) |
31 | gdb_regs[i] = 0; |
32 | |
33 | gdb_regs[GDB_Y] = regs->y; |
34 | gdb_regs[GDB_PSR] = regs->psr; |
35 | gdb_regs[GDB_WIM] = 0; |
36 | gdb_regs[GDB_TBR] = (unsigned long) &trapbase; |
37 | gdb_regs[GDB_PC] = regs->pc; |
38 | gdb_regs[GDB_NPC] = regs->npc; |
39 | gdb_regs[GDB_FSR] = 0; |
40 | gdb_regs[GDB_CSR] = 0; |
41 | } |
42 | |
43 | void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) |
44 | { |
45 | struct thread_info *t = task_thread_info(p); |
46 | struct reg_window32 *win; |
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] = 0; |
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_window32 *) t->ksp; |
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_F31; i++) |
65 | gdb_regs[i] = 0; |
66 | |
67 | gdb_regs[GDB_Y] = 0; |
68 | |
69 | gdb_regs[GDB_PSR] = t->kpsr; |
70 | gdb_regs[GDB_WIM] = t->kwim; |
71 | gdb_regs[GDB_TBR] = (unsigned long) &trapbase; |
72 | gdb_regs[GDB_PC] = t->kpc; |
73 | gdb_regs[GDB_NPC] = t->kpc + 4; |
74 | gdb_regs[GDB_FSR] = 0; |
75 | gdb_regs[GDB_CSR] = 0; |
76 | } |
77 | |
78 | void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs) |
79 | { |
80 | struct reg_window32 *win; |
81 | int i; |
82 | |
83 | for (i = 0; i < 15; i++) |
84 | regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i]; |
85 | |
86 | /* If the PSR register is changing, we have to preserve |
87 | * the CWP field, otherwise window save/restore explodes. |
88 | */ |
89 | if (regs->psr != gdb_regs[GDB_PSR]) { |
90 | unsigned long cwp = regs->psr & PSR_CWP; |
91 | |
92 | regs->psr = (gdb_regs[GDB_PSR] & ~PSR_CWP) | cwp; |
93 | } |
94 | |
95 | regs->pc = gdb_regs[GDB_PC]; |
96 | regs->npc = gdb_regs[GDB_NPC]; |
97 | regs->y = gdb_regs[GDB_Y]; |
98 | |
99 | win = (struct reg_window32 *) regs->u_regs[UREG_FP]; |
100 | for (i = 0; i < 8; i++) |
101 | win->locals[i] = gdb_regs[GDB_L0 + i]; |
102 | for (i = 0; i < 8; i++) |
103 | win->ins[i] = gdb_regs[GDB_I0 + i]; |
104 | } |
105 | |
106 | int kgdb_arch_handle_exception(int e_vector, int signo, int err_code, |
107 | char *remcomInBuffer, char *remcomOutBuffer, |
108 | struct pt_regs *linux_regs) |
109 | { |
110 | unsigned long addr; |
111 | char *ptr; |
112 | |
113 | switch (remcomInBuffer[0]) { |
114 | case 'c': |
115 | /* try to read optional parameter, pc unchanged if no parm */ |
116 | ptr = &remcomInBuffer[1]; |
117 | if (kgdb_hex2long(&ptr, &addr)) { |
118 | linux_regs->pc = addr; |
119 | linux_regs->npc = addr + 4; |
120 | } |
121 | /* fallthru */ |
122 | |
123 | case 'D': |
124 | case 'k': |
125 | if (linux_regs->pc == (unsigned long) arch_kgdb_breakpoint) { |
126 | linux_regs->pc = linux_regs->npc; |
127 | linux_regs->npc += 4; |
128 | } |
129 | return 0; |
130 | } |
131 | return -1; |
132 | } |
133 | |
134 | extern void do_hw_interrupt(struct pt_regs *regs, unsigned long type); |
135 | |
136 | asmlinkage void kgdb_trap(struct pt_regs *regs) |
137 | { |
138 | unsigned long flags; |
139 | |
140 | if (user_mode(regs)) { |
141 | do_hw_interrupt(regs, 0xfd); |
142 | return; |
143 | } |
144 | |
145 | flushw_all(); |
146 | |
147 | local_irq_save(flags); |
148 | kgdb_handle_exception(0x172, SIGTRAP, 0, regs); |
149 | local_irq_restore(flags); |
150 | } |
151 | |
152 | int kgdb_arch_init(void) |
153 | { |
154 | return 0; |
155 | } |
156 | |
157 | void kgdb_arch_exit(void) |
158 | { |
159 | } |
160 | |
161 | void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip) |
162 | { |
163 | regs->pc = ip; |
164 | regs->npc = regs->pc + 4; |
165 | } |
166 | |
167 | struct kgdb_arch arch_kgdb_ops = { |
168 | /* Breakpoint instruction: ta 0x7d */ |
169 | .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x7d }, |
170 | }; |
171 |
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