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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 | 14 | |
3c46e2d6 | 15 | #include "kernel.h" |
06fc7b50 SR |
16 | #include "entry.h" |
17 | ||
e2fdd7fd DM |
18 | void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs) |
19 | { | |
4d7b92ad | 20 | struct reg_window32 *win; |
e2fdd7fd DM |
21 | int i; |
22 | ||
23 | gdb_regs[GDB_G0] = 0; | |
24 | for (i = 0; i < 15; i++) | |
25 | gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i]; | |
26 | ||
4d7b92ad | 27 | win = (struct reg_window32 *) regs->u_regs[UREG_FP]; |
e2fdd7fd DM |
28 | for (i = 0; i < 8; i++) |
29 | gdb_regs[GDB_L0 + i] = win->locals[i]; | |
30 | for (i = 0; i < 8; i++) | |
31 | gdb_regs[GDB_I0 + i] = win->ins[i]; | |
32 | ||
33 | for (i = GDB_F0; i <= GDB_F31; i++) | |
34 | gdb_regs[i] = 0; | |
35 | ||
36 | gdb_regs[GDB_Y] = regs->y; | |
37 | gdb_regs[GDB_PSR] = regs->psr; | |
38 | gdb_regs[GDB_WIM] = 0; | |
39 | gdb_regs[GDB_TBR] = (unsigned long) &trapbase; | |
40 | gdb_regs[GDB_PC] = regs->pc; | |
41 | gdb_regs[GDB_NPC] = regs->npc; | |
42 | gdb_regs[GDB_FSR] = 0; | |
43 | gdb_regs[GDB_CSR] = 0; | |
44 | } | |
45 | ||
46 | void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) | |
47 | { | |
48 | struct thread_info *t = task_thread_info(p); | |
4d7b92ad | 49 | struct reg_window32 *win; |
e2fdd7fd DM |
50 | int i; |
51 | ||
52 | for (i = GDB_G0; i < GDB_G6; i++) | |
53 | gdb_regs[i] = 0; | |
54 | gdb_regs[GDB_G6] = (unsigned long) t; | |
55 | gdb_regs[GDB_G7] = 0; | |
56 | for (i = GDB_O0; i < GDB_SP; i++) | |
57 | gdb_regs[i] = 0; | |
58 | gdb_regs[GDB_SP] = t->ksp; | |
59 | gdb_regs[GDB_O7] = 0; | |
60 | ||
4d7b92ad | 61 | win = (struct reg_window32 *) t->ksp; |
e2fdd7fd DM |
62 | for (i = 0; i < 8; i++) |
63 | gdb_regs[GDB_L0 + i] = win->locals[i]; | |
64 | for (i = 0; i < 8; i++) | |
65 | gdb_regs[GDB_I0 + i] = win->ins[i]; | |
66 | ||
67 | for (i = GDB_F0; i <= GDB_F31; i++) | |
68 | gdb_regs[i] = 0; | |
69 | ||
70 | gdb_regs[GDB_Y] = 0; | |
71 | ||
72 | gdb_regs[GDB_PSR] = t->kpsr; | |
73 | gdb_regs[GDB_WIM] = t->kwim; | |
74 | gdb_regs[GDB_TBR] = (unsigned long) &trapbase; | |
75 | gdb_regs[GDB_PC] = t->kpc; | |
76 | gdb_regs[GDB_NPC] = t->kpc + 4; | |
77 | gdb_regs[GDB_FSR] = 0; | |
78 | gdb_regs[GDB_CSR] = 0; | |
79 | } | |
80 | ||
81 | void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs) | |
82 | { | |
4d7b92ad | 83 | struct reg_window32 *win; |
e2fdd7fd DM |
84 | int i; |
85 | ||
86 | for (i = 0; i < 15; i++) | |
87 | regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i]; | |
88 | ||
89 | /* If the PSR register is changing, we have to preserve | |
90 | * the CWP field, otherwise window save/restore explodes. | |
91 | */ | |
92 | if (regs->psr != gdb_regs[GDB_PSR]) { | |
93 | unsigned long cwp = regs->psr & PSR_CWP; | |
94 | ||
95 | regs->psr = (gdb_regs[GDB_PSR] & ~PSR_CWP) | cwp; | |
96 | } | |
97 | ||
98 | regs->pc = gdb_regs[GDB_PC]; | |
99 | regs->npc = gdb_regs[GDB_NPC]; | |
100 | regs->y = gdb_regs[GDB_Y]; | |
101 | ||
4d7b92ad | 102 | win = (struct reg_window32 *) regs->u_regs[UREG_FP]; |
e2fdd7fd DM |
103 | for (i = 0; i < 8; i++) |
104 | win->locals[i] = gdb_regs[GDB_L0 + i]; | |
105 | for (i = 0; i < 8; i++) | |
106 | win->ins[i] = gdb_regs[GDB_I0 + i]; | |
107 | } | |
108 | ||
109 | int kgdb_arch_handle_exception(int e_vector, int signo, int err_code, | |
110 | char *remcomInBuffer, char *remcomOutBuffer, | |
111 | struct pt_regs *linux_regs) | |
112 | { | |
113 | unsigned long addr; | |
114 | char *ptr; | |
115 | ||
116 | switch (remcomInBuffer[0]) { | |
117 | case 'c': | |
118 | /* try to read optional parameter, pc unchanged if no parm */ | |
119 | ptr = &remcomInBuffer[1]; | |
120 | if (kgdb_hex2long(&ptr, &addr)) { | |
121 | linux_regs->pc = addr; | |
122 | linux_regs->npc = addr + 4; | |
123 | } | |
124 | /* fallthru */ | |
125 | ||
126 | case 'D': | |
127 | case 'k': | |
128 | if (linux_regs->pc == (unsigned long) arch_kgdb_breakpoint) { | |
129 | linux_regs->pc = linux_regs->npc; | |
130 | linux_regs->npc += 4; | |
131 | } | |
132 | return 0; | |
133 | } | |
134 | return -1; | |
135 | } | |
136 | ||
d097efa9 | 137 | asmlinkage void kgdb_trap(unsigned long trap_level, struct pt_regs *regs) |
e2fdd7fd DM |
138 | { |
139 | unsigned long flags; | |
140 | ||
141 | if (user_mode(regs)) { | |
d097efa9 | 142 | do_hw_interrupt(regs, trap_level); |
e2fdd7fd DM |
143 | return; |
144 | } | |
145 | ||
146 | flushw_all(); | |
147 | ||
148 | local_irq_save(flags); | |
d097efa9 | 149 | kgdb_handle_exception(trap_level, SIGTRAP, 0, regs); |
e2fdd7fd DM |
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 | }; |