David S. Miller | e2fdd7f | 2008-04-29 02:38:50 -0700 | [diff] [blame] | 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> |
David Howells | d550bbd | 2012-03-28 18:30:03 +0100 | [diff] [blame] | 12 | #include <asm/cacheflush.h> |
David S. Miller | e2fdd7f | 2008-04-29 02:38:50 -0700 | [diff] [blame] | 13 | |
| 14 | extern unsigned long trapbase; |
| 15 | |
| 16 | void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs) |
| 17 | { |
Sam Ravnborg | 4d7b92a | 2009-01-02 19:32:59 -0800 | [diff] [blame] | 18 | struct reg_window32 *win; |
David S. Miller | e2fdd7f | 2008-04-29 02:38:50 -0700 | [diff] [blame] | 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 | |
Sam Ravnborg | 4d7b92a | 2009-01-02 19:32:59 -0800 | [diff] [blame] | 25 | win = (struct reg_window32 *) regs->u_regs[UREG_FP]; |
David S. Miller | e2fdd7f | 2008-04-29 02:38:50 -0700 | [diff] [blame] | 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); |
Sam Ravnborg | 4d7b92a | 2009-01-02 19:32:59 -0800 | [diff] [blame] | 47 | struct reg_window32 *win; |
David S. Miller | e2fdd7f | 2008-04-29 02:38:50 -0700 | [diff] [blame] | 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 | |
Sam Ravnborg | 4d7b92a | 2009-01-02 19:32:59 -0800 | [diff] [blame] | 59 | win = (struct reg_window32 *) t->ksp; |
David S. Miller | e2fdd7f | 2008-04-29 02:38:50 -0700 | [diff] [blame] | 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 | { |
Sam Ravnborg | 4d7b92a | 2009-01-02 19:32:59 -0800 | [diff] [blame] | 81 | struct reg_window32 *win; |
David S. Miller | e2fdd7f | 2008-04-29 02:38:50 -0700 | [diff] [blame] | 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 | |
Sam Ravnborg | 4d7b92a | 2009-01-02 19:32:59 -0800 | [diff] [blame] | 100 | win = (struct reg_window32 *) regs->u_regs[UREG_FP]; |
David S. Miller | e2fdd7f | 2008-04-29 02:38:50 -0700 | [diff] [blame] | 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 | |
Jason Wessel | c75fbb0 | 2010-05-20 21:04:19 -0500 | [diff] [blame] | 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 | |
David S. Miller | e2fdd7f | 2008-04-29 02:38:50 -0700 | [diff] [blame] | 168 | struct kgdb_arch arch_kgdb_ops = { |
| 169 | /* Breakpoint instruction: ta 0x7d */ |
| 170 | .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x7d }, |
| 171 | }; |