165 lines
3.6 KiB
C
165 lines
3.6 KiB
C
/* kgdb.c: KGDB support for 32-bit sparc.
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*
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* Copyright (C) 2008 David S. Miller <davem@davemloft.net>
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*/
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#include <linux/kgdb.h>
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#include <linux/kdebug.h>
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#include <asm/kdebug.h>
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#include <asm/ptrace.h>
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#include <asm/irq.h>
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extern unsigned long trapbase;
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void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
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{
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struct reg_window *win;
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int i;
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gdb_regs[GDB_G0] = 0;
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for (i = 0; i < 15; i++)
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gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i];
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win = (struct reg_window *) regs->u_regs[UREG_FP];
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for (i = 0; i < 8; i++)
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gdb_regs[GDB_L0 + i] = win->locals[i];
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for (i = 0; i < 8; i++)
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gdb_regs[GDB_I0 + i] = win->ins[i];
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for (i = GDB_F0; i <= GDB_F31; i++)
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gdb_regs[i] = 0;
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gdb_regs[GDB_Y] = regs->y;
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gdb_regs[GDB_PSR] = regs->psr;
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gdb_regs[GDB_WIM] = 0;
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gdb_regs[GDB_TBR] = (unsigned long) &trapbase;
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gdb_regs[GDB_PC] = regs->pc;
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gdb_regs[GDB_NPC] = regs->npc;
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gdb_regs[GDB_FSR] = 0;
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gdb_regs[GDB_CSR] = 0;
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}
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void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
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{
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struct thread_info *t = task_thread_info(p);
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struct reg_window *win;
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int i;
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for (i = GDB_G0; i < GDB_G6; i++)
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gdb_regs[i] = 0;
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gdb_regs[GDB_G6] = (unsigned long) t;
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gdb_regs[GDB_G7] = 0;
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for (i = GDB_O0; i < GDB_SP; i++)
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gdb_regs[i] = 0;
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gdb_regs[GDB_SP] = t->ksp;
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gdb_regs[GDB_O7] = 0;
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win = (struct reg_window *) t->ksp;
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for (i = 0; i < 8; i++)
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gdb_regs[GDB_L0 + i] = win->locals[i];
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for (i = 0; i < 8; i++)
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gdb_regs[GDB_I0 + i] = win->ins[i];
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for (i = GDB_F0; i <= GDB_F31; i++)
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gdb_regs[i] = 0;
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gdb_regs[GDB_Y] = 0;
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gdb_regs[GDB_PSR] = t->kpsr;
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gdb_regs[GDB_WIM] = t->kwim;
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gdb_regs[GDB_TBR] = (unsigned long) &trapbase;
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gdb_regs[GDB_PC] = t->kpc;
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gdb_regs[GDB_NPC] = t->kpc + 4;
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gdb_regs[GDB_FSR] = 0;
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gdb_regs[GDB_CSR] = 0;
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}
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void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
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{
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struct reg_window *win;
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int i;
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for (i = 0; i < 15; i++)
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regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i];
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/* If the PSR register is changing, we have to preserve
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* the CWP field, otherwise window save/restore explodes.
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*/
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if (regs->psr != gdb_regs[GDB_PSR]) {
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unsigned long cwp = regs->psr & PSR_CWP;
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regs->psr = (gdb_regs[GDB_PSR] & ~PSR_CWP) | cwp;
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}
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regs->pc = gdb_regs[GDB_PC];
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regs->npc = gdb_regs[GDB_NPC];
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regs->y = gdb_regs[GDB_Y];
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win = (struct reg_window *) regs->u_regs[UREG_FP];
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for (i = 0; i < 8; i++)
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win->locals[i] = gdb_regs[GDB_L0 + i];
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for (i = 0; i < 8; i++)
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win->ins[i] = gdb_regs[GDB_I0 + i];
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}
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int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
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char *remcomInBuffer, char *remcomOutBuffer,
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struct pt_regs *linux_regs)
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{
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unsigned long addr;
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char *ptr;
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switch (remcomInBuffer[0]) {
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case 'c':
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/* try to read optional parameter, pc unchanged if no parm */
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ptr = &remcomInBuffer[1];
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if (kgdb_hex2long(&ptr, &addr)) {
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linux_regs->pc = addr;
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linux_regs->npc = addr + 4;
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}
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/* fallthru */
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case 'D':
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case 'k':
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if (linux_regs->pc == (unsigned long) arch_kgdb_breakpoint) {
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linux_regs->pc = linux_regs->npc;
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linux_regs->npc += 4;
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}
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return 0;
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}
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return -1;
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}
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extern void do_hw_interrupt(struct pt_regs *regs, unsigned long type);
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asmlinkage void kgdb_trap(struct pt_regs *regs)
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{
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unsigned long flags;
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if (user_mode(regs)) {
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do_hw_interrupt(regs, 0xfd);
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return;
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}
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flushw_all();
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local_irq_save(flags);
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kgdb_handle_exception(0x172, SIGTRAP, 0, regs);
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local_irq_restore(flags);
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}
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int kgdb_arch_init(void)
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{
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return 0;
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}
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void kgdb_arch_exit(void)
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{
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}
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struct kgdb_arch arch_kgdb_ops = {
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/* Breakpoint instruction: ta 0x7d */
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.gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x7d },
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};
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