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e2fdd7fd DM |
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> | |
26f7936c | 8 | #include <linux/sched.h> |
e2fdd7fd DM |
9 | |
10 | #include <asm/kdebug.h> | |
11 | #include <asm/ptrace.h> | |
12 | #include <asm/irq.h> | |
d550bbd4 | 13 | #include <asm/cacheflush.h> |
e2fdd7fd DM |
14 | |
15 | extern unsigned long trapbase; | |
16 | ||
17 | void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs) | |
18 | { | |
4d7b92ad | 19 | struct reg_window32 *win; |
e2fdd7fd DM |
20 | int i; |
21 | ||
22 | gdb_regs[GDB_G0] = 0; | |
23 | for (i = 0; i < 15; i++) | |
24 | gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i]; | |
25 | ||
4d7b92ad | 26 | win = (struct reg_window32 *) regs->u_regs[UREG_FP]; |
e2fdd7fd DM |
27 | for (i = 0; i < 8; i++) |
28 | gdb_regs[GDB_L0 + i] = win->locals[i]; | |
29 | for (i = 0; i < 8; i++) | |
30 | gdb_regs[GDB_I0 + i] = win->ins[i]; | |
31 | ||
32 | for (i = GDB_F0; i <= GDB_F31; i++) | |
33 | gdb_regs[i] = 0; | |
34 | ||
35 | gdb_regs[GDB_Y] = regs->y; | |
36 | gdb_regs[GDB_PSR] = regs->psr; | |
37 | gdb_regs[GDB_WIM] = 0; | |
38 | gdb_regs[GDB_TBR] = (unsigned long) &trapbase; | |
39 | gdb_regs[GDB_PC] = regs->pc; | |
40 | gdb_regs[GDB_NPC] = regs->npc; | |
41 | gdb_regs[GDB_FSR] = 0; | |
42 | gdb_regs[GDB_CSR] = 0; | |
43 | } | |
44 | ||
45 | void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) | |
46 | { | |
47 | struct thread_info *t = task_thread_info(p); | |
4d7b92ad | 48 | struct reg_window32 *win; |
e2fdd7fd DM |
49 | int i; |
50 | ||
51 | for (i = GDB_G0; i < GDB_G6; i++) | |
52 | gdb_regs[i] = 0; | |
53 | gdb_regs[GDB_G6] = (unsigned long) t; | |
54 | gdb_regs[GDB_G7] = 0; | |
55 | for (i = GDB_O0; i < GDB_SP; i++) | |
56 | gdb_regs[i] = 0; | |
57 | gdb_regs[GDB_SP] = t->ksp; | |
58 | gdb_regs[GDB_O7] = 0; | |
59 | ||
4d7b92ad | 60 | win = (struct reg_window32 *) t->ksp; |
e2fdd7fd DM |
61 | for (i = 0; i < 8; i++) |
62 | gdb_regs[GDB_L0 + i] = win->locals[i]; | |
63 | for (i = 0; i < 8; i++) | |
64 | gdb_regs[GDB_I0 + i] = win->ins[i]; | |
65 | ||
66 | for (i = GDB_F0; i <= GDB_F31; i++) | |
67 | gdb_regs[i] = 0; | |
68 | ||
69 | gdb_regs[GDB_Y] = 0; | |
70 | ||
71 | gdb_regs[GDB_PSR] = t->kpsr; | |
72 | gdb_regs[GDB_WIM] = t->kwim; | |
73 | gdb_regs[GDB_TBR] = (unsigned long) &trapbase; | |
74 | gdb_regs[GDB_PC] = t->kpc; | |
75 | gdb_regs[GDB_NPC] = t->kpc + 4; | |
76 | gdb_regs[GDB_FSR] = 0; | |
77 | gdb_regs[GDB_CSR] = 0; | |
78 | } | |
79 | ||
80 | void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs) | |
81 | { | |
4d7b92ad | 82 | struct reg_window32 *win; |
e2fdd7fd DM |
83 | int i; |
84 | ||
85 | for (i = 0; i < 15; i++) | |
86 | regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i]; | |
87 | ||
88 | /* If the PSR register is changing, we have to preserve | |
89 | * the CWP field, otherwise window save/restore explodes. | |
90 | */ | |
91 | if (regs->psr != gdb_regs[GDB_PSR]) { | |
92 | unsigned long cwp = regs->psr & PSR_CWP; | |
93 | ||
94 | regs->psr = (gdb_regs[GDB_PSR] & ~PSR_CWP) | cwp; | |
95 | } | |
96 | ||
97 | regs->pc = gdb_regs[GDB_PC]; | |
98 | regs->npc = gdb_regs[GDB_NPC]; | |
99 | regs->y = gdb_regs[GDB_Y]; | |
100 | ||
4d7b92ad | 101 | win = (struct reg_window32 *) regs->u_regs[UREG_FP]; |
e2fdd7fd DM |
102 | for (i = 0; i < 8; i++) |
103 | win->locals[i] = gdb_regs[GDB_L0 + i]; | |
104 | for (i = 0; i < 8; i++) | |
105 | win->ins[i] = gdb_regs[GDB_I0 + i]; | |
106 | } | |
107 | ||
108 | int kgdb_arch_handle_exception(int e_vector, int signo, int err_code, | |
109 | char *remcomInBuffer, char *remcomOutBuffer, | |
110 | struct pt_regs *linux_regs) | |
111 | { | |
112 | unsigned long addr; | |
113 | char *ptr; | |
114 | ||
115 | switch (remcomInBuffer[0]) { | |
116 | case 'c': | |
117 | /* try to read optional parameter, pc unchanged if no parm */ | |
118 | ptr = &remcomInBuffer[1]; | |
119 | if (kgdb_hex2long(&ptr, &addr)) { | |
120 | linux_regs->pc = addr; | |
121 | linux_regs->npc = addr + 4; | |
122 | } | |
123 | /* fallthru */ | |
124 | ||
125 | case 'D': | |
126 | case 'k': | |
127 | if (linux_regs->pc == (unsigned long) arch_kgdb_breakpoint) { | |
128 | linux_regs->pc = linux_regs->npc; | |
129 | linux_regs->npc += 4; | |
130 | } | |
131 | return 0; | |
132 | } | |
133 | return -1; | |
134 | } | |
135 | ||
136 | extern void do_hw_interrupt(struct pt_regs *regs, unsigned long type); | |
137 | ||
138 | asmlinkage void kgdb_trap(struct pt_regs *regs) | |
139 | { | |
140 | unsigned long flags; | |
141 | ||
142 | if (user_mode(regs)) { | |
143 | do_hw_interrupt(regs, 0xfd); | |
144 | return; | |
145 | } | |
146 | ||
147 | flushw_all(); | |
148 | ||
149 | local_irq_save(flags); | |
150 | kgdb_handle_exception(0x172, SIGTRAP, 0, regs); | |
151 | local_irq_restore(flags); | |
152 | } | |
153 | ||
154 | int kgdb_arch_init(void) | |
155 | { | |
156 | return 0; | |
157 | } | |
158 | ||
159 | void kgdb_arch_exit(void) | |
160 | { | |
161 | } | |
162 | ||
c75fbb05 JW |
163 | void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip) |
164 | { | |
165 | regs->pc = ip; | |
166 | regs->npc = regs->pc + 4; | |
167 | } | |
168 | ||
e2fdd7fd DM |
169 | struct kgdb_arch arch_kgdb_ops = { |
170 | /* Breakpoint instruction: ta 0x7d */ | |
171 | .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x7d }, | |
172 | }; |