--- /dev/null
+/* kgdb.c: KGDB support for 64-bit sparc.
+ *
+ * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
+ */
+
+#include <linux/kgdb.h>
+#include <linux/kdebug.h>
+#include <linux/ftrace.h>
+#include <linux/context_tracking.h>
+
+#include <asm/cacheflush.h>
+#include <asm/kdebug.h>
+#include <asm/ptrace.h>
+#include <asm/irq.h>
+
+#include "kernel.h"
+
+void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+ struct reg_window *win;
+ int i;
+
+ gdb_regs[GDB_G0] = 0;
+ for (i = 0; i < 15; i++)
+ gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i];
+
+ win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS);
+ for (i = 0; i < 8; i++)
+ gdb_regs[GDB_L0 + i] = win->locals[i];
+ for (i = 0; i < 8; i++)
+ gdb_regs[GDB_I0 + i] = win->ins[i];
+
+ for (i = GDB_F0; i <= GDB_F62; i++)
+ gdb_regs[i] = 0;
+
+ gdb_regs[GDB_PC] = regs->tpc;
+ gdb_regs[GDB_NPC] = regs->tnpc;
+ gdb_regs[GDB_STATE] = regs->tstate;
+ gdb_regs[GDB_FSR] = 0;
+ gdb_regs[GDB_FPRS] = 0;
+ gdb_regs[GDB_Y] = regs->y;
+}
+
+void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
+{
+ struct thread_info *t = task_thread_info(p);
+ extern unsigned int switch_to_pc;
+ extern unsigned int ret_from_fork;
+ struct reg_window *win;
+ unsigned long pc, cwp;
+ int i;
+
+ for (i = GDB_G0; i < GDB_G6; i++)
+ gdb_regs[i] = 0;
+ gdb_regs[GDB_G6] = (unsigned long) t;
+ gdb_regs[GDB_G7] = (unsigned long) p;
+ for (i = GDB_O0; i < GDB_SP; i++)
+ gdb_regs[i] = 0;
+ gdb_regs[GDB_SP] = t->ksp;
+ gdb_regs[GDB_O7] = 0;
+
+ win = (struct reg_window *) (t->ksp + STACK_BIAS);
+ for (i = 0; i < 8; i++)
+ gdb_regs[GDB_L0 + i] = win->locals[i];
+ for (i = 0; i < 8; i++)
+ gdb_regs[GDB_I0 + i] = win->ins[i];
+
+ for (i = GDB_F0; i <= GDB_F62; i++)
+ gdb_regs[i] = 0;
+
+ if (t->new_child)
+ pc = (unsigned long) &ret_from_fork;
+ else
+ pc = (unsigned long) &switch_to_pc;
+
+ gdb_regs[GDB_PC] = pc;
+ gdb_regs[GDB_NPC] = pc + 4;
+
+ cwp = __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP];
+
+ gdb_regs[GDB_STATE] = (TSTATE_PRIV | TSTATE_IE | cwp);
+ gdb_regs[GDB_FSR] = 0;
+ gdb_regs[GDB_FPRS] = 0;
+ gdb_regs[GDB_Y] = 0;
+}
+
+void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+ struct reg_window *win;
+ int i;
+
+ for (i = 0; i < 15; i++)
+ regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i];
+
+ /* If the TSTATE register is changing, we have to preserve
+ * the CWP field, otherwise window save/restore explodes.
+ */
+ if (regs->tstate != gdb_regs[GDB_STATE]) {
+ unsigned long cwp = regs->tstate & TSTATE_CWP;
+
+ regs->tstate = (gdb_regs[GDB_STATE] & ~TSTATE_CWP) | cwp;
+ }
+
+ regs->tpc = gdb_regs[GDB_PC];
+ regs->tnpc = gdb_regs[GDB_NPC];
+ regs->y = gdb_regs[GDB_Y];
+
+ win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS);
+ for (i = 0; i < 8; i++)
+ win->locals[i] = gdb_regs[GDB_L0 + i];
+ for (i = 0; i < 8; i++)
+ win->ins[i] = gdb_regs[GDB_I0 + i];
+}
+
+#ifdef CONFIG_SMP
+void __irq_entry smp_kgdb_capture_client(int irq, struct pt_regs *regs)
+{
+ unsigned long flags;
+
+ __asm__ __volatile__("rdpr %%pstate, %0\n\t"
+ "wrpr %0, %1, %%pstate"
+ : "=r" (flags)
+ : "i" (PSTATE_IE));
+
+ flushw_all();
+
+ if (atomic_read(&kgdb_active) != -1)
+ kgdb_nmicallback(raw_smp_processor_id(), regs);
+
+ __asm__ __volatile__("wrpr %0, 0, %%pstate"
+ : : "r" (flags));
+}
+#endif
+
+int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
+ char *remcomInBuffer, char *remcomOutBuffer,
+ struct pt_regs *linux_regs)
+{
+ unsigned long addr;
+ char *ptr;
+
+ switch (remcomInBuffer[0]) {
+ case 'c':
+ /* try to read optional parameter, pc unchanged if no parm */
+ ptr = &remcomInBuffer[1];
+ if (kgdb_hex2long(&ptr, &addr)) {
+ linux_regs->tpc = addr;
+ linux_regs->tnpc = addr + 4;
+ }
+ /* fallthru */
+
+ case 'D':
+ case 'k':
+ if (linux_regs->tpc == (unsigned long) arch_kgdb_breakpoint) {
+ linux_regs->tpc = linux_regs->tnpc;
+ linux_regs->tnpc += 4;
+ }
+ return 0;
+ }
+ return -1;
+}
+
+asmlinkage void kgdb_trap(unsigned long trap_level, struct pt_regs *regs)
+{
+ enum ctx_state prev_state = exception_enter();
+ unsigned long flags;
+
+ if (user_mode(regs)) {
+ bad_trap(regs, trap_level);
+ goto out;
+ }
+
+ flushw_all();
+
+ local_irq_save(flags);
+ kgdb_handle_exception(0x172, SIGTRAP, 0, regs);
+ local_irq_restore(flags);
+out:
+ exception_exit(prev_state);
+}
+
+int kgdb_arch_init(void)
+{
+ return 0;
+}
+
+void kgdb_arch_exit(void)
+{
+}
+
+void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
+{
+ regs->tpc = ip;
+ regs->tnpc = regs->tpc + 4;
+}
+
+struct kgdb_arch arch_kgdb_ops = {
+ /* Breakpoint instruction: ta 0x72 */
+ .gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x72 },
+};
Code Review / kvmfornfv.git / blobdiff