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