nfsd4: typo logical vs bitwise negate for want_mask
[linux-btrfs-devel.git] / arch / microblaze / kernel / kgdb.c
blob09a5e82861371ef35e3589ab89b534575ee162be
1 /*
2 * Microblaze KGDB support
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 */
9 #include <linux/kgdb.h>
10 #include <linux/kdebug.h>
11 #include <linux/irq.h>
12 #include <linux/io.h>
13 #include <asm/cacheflush.h>
14 #include <asm/asm-offsets.h>
15 #include <asm/pvr.h>
17 #define GDB_REG 0
18 #define GDB_PC 32
19 #define GDB_MSR 33
20 #define GDB_EAR 34
21 #define GDB_ESR 35
22 #define GDB_FSR 36
23 #define GDB_BTR 37
24 #define GDB_PVR 38
25 #define GDB_REDR 50
26 #define GDB_RPID 51
27 #define GDB_RZPR 52
28 #define GDB_RTLBX 53
29 #define GDB_RTLBSX 54 /* mfs can't read it */
30 #define GDB_RTLBLO 55
31 #define GDB_RTLBHI 56
33 /* keep pvr separately because it is unchangeble */
34 struct pvr_s pvr;
36 void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
38 int i;
39 unsigned long *pt_regb = (unsigned long *)regs;
40 int temp;
41 /* registers r0 - r31, pc, msr, ear, esr, fsr + do not save pt_mode */
42 for (i = 0; i < (sizeof(struct pt_regs) / 4) - 1; i++)
43 gdb_regs[i] = pt_regb[i];
45 /* Branch target register can't be changed */
46 __asm__ __volatile__ ("mfs %0, rbtr;" : "=r"(temp) : );
47 gdb_regs[GDB_BTR] = temp;
49 /* pvr part - we have 11 pvr regs */
50 for (i = 0; i < sizeof(struct pvr_s)/4; i++)
51 gdb_regs[GDB_PVR + i] = pvr.pvr[i];
53 /* read special registers - can't be changed */
54 __asm__ __volatile__ ("mfs %0, redr;" : "=r"(temp) : );
55 gdb_regs[GDB_REDR] = temp;
56 __asm__ __volatile__ ("mfs %0, rpid;" : "=r"(temp) : );
57 gdb_regs[GDB_RPID] = temp;
58 __asm__ __volatile__ ("mfs %0, rzpr;" : "=r"(temp) : );
59 gdb_regs[GDB_RZPR] = temp;
60 __asm__ __volatile__ ("mfs %0, rtlbx;" : "=r"(temp) : );
61 gdb_regs[GDB_RTLBX] = temp;
62 __asm__ __volatile__ ("mfs %0, rtlblo;" : "=r"(temp) : );
63 gdb_regs[GDB_RTLBLO] = temp;
64 __asm__ __volatile__ ("mfs %0, rtlbhi;" : "=r"(temp) : );
65 gdb_regs[GDB_RTLBHI] = temp;
68 void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
70 int i;
71 unsigned long *pt_regb = (unsigned long *)regs;
73 /* pt_regs and gdb_regs have the same 37 values.
74 * The rest of gdb_regs are unused and can't be changed.
75 * r0 register value can't be changed too. */
76 for (i = 1; i < (sizeof(struct pt_regs) / 4) - 1; i++)
77 pt_regb[i] = gdb_regs[i];
80 void microblaze_kgdb_break(struct pt_regs *regs)
82 if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0)
83 return;
85 /* Jump over the first arch_kgdb_breakpoint which is barrier to
86 * get kgdb work. The same solution is used for powerpc */
87 if (*(u32 *) (regs->pc) == *(u32 *) (&arch_kgdb_ops.gdb_bpt_instr))
88 regs->pc += BREAK_INSTR_SIZE;
91 /* untested */
92 void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
94 int i;
95 unsigned long *pt_regb = (unsigned long *)(p->thread.regs);
97 /* registers r0 - r31, pc, msr, ear, esr, fsr + do not save pt_mode */
98 for (i = 0; i < (sizeof(struct pt_regs) / 4) - 1; i++)
99 gdb_regs[i] = pt_regb[i];
101 /* pvr part - we have 11 pvr regs */
102 for (i = 0; i < sizeof(struct pvr_s)/4; i++)
103 gdb_regs[GDB_PVR + i] = pvr.pvr[i];
106 void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
108 regs->pc = ip;
111 int kgdb_arch_handle_exception(int vector, int signo, int err_code,
112 char *remcom_in_buffer, char *remcom_out_buffer,
113 struct pt_regs *regs)
115 char *ptr;
116 unsigned long address;
118 switch (remcom_in_buffer[0]) {
119 case 'c':
120 /* handle the optional parameter */
121 ptr = &remcom_in_buffer[1];
122 if (kgdb_hex2long(&ptr, &address))
123 regs->pc = address;
125 return 0;
127 return -1; /* this means that we do not want to exit from the handler */
130 int kgdb_arch_init(void)
132 get_pvr(&pvr); /* Fill PVR structure */
133 return 0;
136 void kgdb_arch_exit(void)
138 /* Nothing to do */
142 * Global data
144 struct kgdb_arch arch_kgdb_ops = {
145 #ifdef __MICROBLAZEEL__
146 .gdb_bpt_instr = {0x18, 0x00, 0x0c, 0xba}, /* brki r16, 0x18 */
147 #else
148 .gdb_bpt_instr = {0xba, 0x0c, 0x00, 0x18}, /* brki r16, 0x18 */
149 #endif