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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_window *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_window *) 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_window *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_window *) 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_window *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_window *) 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 | struct kgdb_arch arch_kgdb_ops = { | |
162 | /* Breakpoint instruction: ta 0x7d */ | |
163 | .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x7d }, | |
164 | }; |