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Source at commit 0de2b2b3be81048189a32f7a3d3ba0ba9ec817b6 created 11 years 11 months ago. By Maarten ter Huurne, MIPS: JZ4740: Fixed value for round robin constant. | |
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1 | /* kgdb.c: KGDB support for 64-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 | #include <linux/ftrace.h> |
9 | |
10 | #include <asm/kdebug.h> |
11 | #include <asm/ptrace.h> |
12 | #include <asm/irq.h> |
13 | |
14 | void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs) |
15 | { |
16 | struct reg_window *win; |
17 | int i; |
18 | |
19 | gdb_regs[GDB_G0] = 0; |
20 | for (i = 0; i < 15; i++) |
21 | gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i]; |
22 | |
23 | win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS); |
24 | for (i = 0; i < 8; i++) |
25 | gdb_regs[GDB_L0 + i] = win->locals[i]; |
26 | for (i = 0; i < 8; i++) |
27 | gdb_regs[GDB_I0 + i] = win->ins[i]; |
28 | |
29 | for (i = GDB_F0; i <= GDB_F62; i++) |
30 | gdb_regs[i] = 0; |
31 | |
32 | gdb_regs[GDB_PC] = regs->tpc; |
33 | gdb_regs[GDB_NPC] = regs->tnpc; |
34 | gdb_regs[GDB_STATE] = regs->tstate; |
35 | gdb_regs[GDB_FSR] = 0; |
36 | gdb_regs[GDB_FPRS] = 0; |
37 | gdb_regs[GDB_Y] = regs->y; |
38 | } |
39 | |
40 | void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) |
41 | { |
42 | struct thread_info *t = task_thread_info(p); |
43 | extern unsigned int switch_to_pc; |
44 | extern unsigned int ret_from_syscall; |
45 | struct reg_window *win; |
46 | unsigned long pc, cwp; |
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] = (unsigned long) p; |
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 + STACK_BIAS); |
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_F62; i++) |
65 | gdb_regs[i] = 0; |
66 | |
67 | if (t->new_child) |
68 | pc = (unsigned long) &ret_from_syscall; |
69 | else |
70 | pc = (unsigned long) &switch_to_pc; |
71 | |
72 | gdb_regs[GDB_PC] = pc; |
73 | gdb_regs[GDB_NPC] = pc + 4; |
74 | |
75 | cwp = __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP]; |
76 | |
77 | gdb_regs[GDB_STATE] = (TSTATE_PRIV | TSTATE_IE | cwp); |
78 | gdb_regs[GDB_FSR] = 0; |
79 | gdb_regs[GDB_FPRS] = 0; |
80 | gdb_regs[GDB_Y] = 0; |
81 | } |
82 | |
83 | void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs) |
84 | { |
85 | struct reg_window *win; |
86 | int i; |
87 | |
88 | for (i = 0; i < 15; i++) |
89 | regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i]; |
90 | |
91 | /* If the TSTATE register is changing, we have to preserve |
92 | * the CWP field, otherwise window save/restore explodes. |
93 | */ |
94 | if (regs->tstate != gdb_regs[GDB_STATE]) { |
95 | unsigned long cwp = regs->tstate & TSTATE_CWP; |
96 | |
97 | regs->tstate = (gdb_regs[GDB_STATE] & ~TSTATE_CWP) | cwp; |
98 | } |
99 | |
100 | regs->tpc = gdb_regs[GDB_PC]; |
101 | regs->tnpc = gdb_regs[GDB_NPC]; |
102 | regs->y = gdb_regs[GDB_Y]; |
103 | |
104 | win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS); |
105 | for (i = 0; i < 8; i++) |
106 | win->locals[i] = gdb_regs[GDB_L0 + i]; |
107 | for (i = 0; i < 8; i++) |
108 | win->ins[i] = gdb_regs[GDB_I0 + i]; |
109 | } |
110 | |
111 | #ifdef CONFIG_SMP |
112 | void __irq_entry smp_kgdb_capture_client(int irq, struct pt_regs *regs) |
113 | { |
114 | unsigned long flags; |
115 | |
116 | __asm__ __volatile__("rdpr %%pstate, %0\n\t" |
117 | "wrpr %0, %1, %%pstate" |
118 | : "=r" (flags) |
119 | : "i" (PSTATE_IE)); |
120 | |
121 | flushw_all(); |
122 | |
123 | if (atomic_read(&kgdb_active) != -1) |
124 | kgdb_nmicallback(raw_smp_processor_id(), regs); |
125 | |
126 | __asm__ __volatile__("wrpr %0, 0, %%pstate" |
127 | : : "r" (flags)); |
128 | } |
129 | #endif |
130 | |
131 | int kgdb_arch_handle_exception(int e_vector, int signo, int err_code, |
132 | char *remcomInBuffer, char *remcomOutBuffer, |
133 | struct pt_regs *linux_regs) |
134 | { |
135 | unsigned long addr; |
136 | char *ptr; |
137 | |
138 | switch (remcomInBuffer[0]) { |
139 | case 'c': |
140 | /* try to read optional parameter, pc unchanged if no parm */ |
141 | ptr = &remcomInBuffer[1]; |
142 | if (kgdb_hex2long(&ptr, &addr)) { |
143 | linux_regs->tpc = addr; |
144 | linux_regs->tnpc = addr + 4; |
145 | } |
146 | /* fallthru */ |
147 | |
148 | case 'D': |
149 | case 'k': |
150 | if (linux_regs->tpc == (unsigned long) arch_kgdb_breakpoint) { |
151 | linux_regs->tpc = linux_regs->tnpc; |
152 | linux_regs->tnpc += 4; |
153 | } |
154 | return 0; |
155 | } |
156 | return -1; |
157 | } |
158 | |
159 | asmlinkage void kgdb_trap(unsigned long trap_level, struct pt_regs *regs) |
160 | { |
161 | unsigned long flags; |
162 | |
163 | if (user_mode(regs)) { |
164 | bad_trap(regs, trap_level); |
165 | return; |
166 | } |
167 | |
168 | flushw_all(); |
169 | |
170 | local_irq_save(flags); |
171 | kgdb_handle_exception(0x172, SIGTRAP, 0, regs); |
172 | local_irq_restore(flags); |
173 | } |
174 | |
175 | int kgdb_arch_init(void) |
176 | { |
177 | return 0; |
178 | } |
179 | |
180 | void kgdb_arch_exit(void) |
181 | { |
182 | } |
183 | |
184 | void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip) |
185 | { |
186 | regs->tpc = ip; |
187 | regs->tnpc = regs->tpc + 4; |
188 | } |
189 | |
190 | struct kgdb_arch arch_kgdb_ops = { |
191 | /* Breakpoint instruction: ta 0x72 */ |
192 | .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x72 }, |
193 | }; |
194 |
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