Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 257 insertions, 0 deletions

diff --git a/gdb/nlm/ppc.c b/gdb/nlm/ppc.c
new file mode 100644
index 0000000..e68397b
--- /dev/null
+++ b/gdb/nlm/ppc.c
@@ -0,0 +1,257 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <time.h>
+#include <errno.h>
+
+#include <nwtypes.h>
+#include <nwdfs.h>
+#include <nwconio.h>
+#include <nwadv.h>
+#include <nwdbgapi.h>
+#include <nwthread.h>
+#include "ppc.h"
+
+extern char *mem2hex (void *mem, char *buf, int count, int may_fault);
+extern char *hex2mem (char *buf, void *mem, int count, int may_fault);
+extern int computeSignal (int exceptionVector);
+
+void
+flush_i_cache (void)
+{
+}
+
+/* Get the registers out of the frame information.  */
+
+void
+frame_to_registers (frame, regs)
+     struct StackFrame *frame;
+     char *regs;
+{
+  mem2hex (&frame->ExceptionState.CsavedRegs, &regs[GP0_REGNUM * 4 * 2], 4 * 32, 0);
+
+  mem2hex (&frame->ExceptionState.CSavedFPRegs, &regs[FP0_REGNUM * 4 * 2], 4 * 32, 0);
+
+  mem2hex (&frame->ExceptionPC, &regs[PC_REGNUM * 4 * 2], 4 * 1, 0);
+
+  mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedSRR1, &regs[CR_REGNUM * 4 * 2], 4 * 1, 0);
+  mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedLR, &regs[LR_REGNUM * 4 * 2], 4 * 1, 0);
+  mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedCTR, &regs[CTR_REGNUM * 4 * 2], 4 * 1, 0);
+  mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedXER, &regs[XER_REGNUM * 4 * 2], 4 * 1, 0);
+  mem2hex (&frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedMQ, &regs[MQ_REGNUM * 4 * 2], 4 * 1, 0);
+}
+
+/* Put the registers back into the frame information.  */
+
+void
+registers_to_frame (regs, frame)
+     char *regs;
+     struct StackFrame *frame;
+{
+  hex2mem (&regs[GP0_REGNUM * 4 * 2], &frame->ExceptionState.CsavedRegs, 4 * 32, 0);
+
+  hex2mem (&regs[FP0_REGNUM * 4 * 2], &frame->ExceptionState.CSavedFPRegs, 4 * 32, 0);
+
+  hex2mem (&regs[PC_REGNUM * 4 * 2], &frame->ExceptionPC, 4 * 1, 0);
+
+  hex2mem (&regs[CR_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedSRR1, 4 * 1, 0);
+  hex2mem (&regs[LR_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedLR, 4 * 1, 0);
+  hex2mem (&regs[CTR_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedCTR, 4 * 1, 0);
+  hex2mem (&regs[XER_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedXER, 4 * 1, 0);
+  hex2mem (&regs[MQ_REGNUM * 4 * 2], &frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedMQ, 4 * 1, 0);
+}
+
+
+extern volatile int mem_err;
+
+#ifdef ALTERNATE_MEM_FUNCS
+extern int ReadByteAltDebugger (char* addr, char *theByte);
+extern int WriteByteAltDebugger (char* addr, char theByte);
+int
+get_char (addr)
+     char *addr;
+{
+  char c;
+
+  if (!ReadByteAltDebugger (addr, &c))
+    mem_err = 1;
+
+  return c;
+}
+
+void
+set_char (addr, val)
+     char *addr;
+     int val;
+{
+  if (!WriteByteAltDebugger (addr, val))
+    mem_err = 1;
+}
+#endif
+
+int
+mem_write (dst, src, len)
+     char *dst, *src;
+     int len;
+{
+  while (len-- && !mem_err)
+    set_char (dst++, *src++);
+
+  return mem_err;
+}
+
+union inst
+{
+  LONG l;
+
+  struct
+    {
+      union
+	{
+	  struct		/* Unconditional branch */
+	    {
+	      unsigned opcode : 6; /* 18 */
+	      signed li : 24;
+	      unsigned aa : 1;
+	      unsigned lk : 1;
+	    } b;
+	  struct		/* Conditional branch */
+	    {
+	      unsigned opcode : 6; /* 16 */
+	      unsigned bo : 5;
+	      unsigned bi : 5;
+	      signed bd : 14;
+	      unsigned aa : 1;
+	      unsigned lk : 1;
+	    } bc;
+	  struct		/* Conditional branch to ctr or lr reg */
+	    {
+	      unsigned opcode : 6; /* 19 */
+	      unsigned bo : 5;
+	      unsigned bi : 5;
+	      unsigned type : 15; /* 528 = ctr, 16 = lr */
+	      unsigned lk : 1;
+	    } bclr;
+	} variant;
+    } inst;
+};
+
+static LONG saved_inst;
+static LONG *saved_inst_pc = 0;
+static LONG saved_target_inst;
+static LONG *saved_target_inst_pc = 0;
+
+void
+set_step_traps (frame)
+     struct StackFrame *frame;
+{
+  union inst inst;
+  LONG *target;
+  int opcode;
+  int ra, rb;
+  LONG *pc = (LONG *)frame->ExceptionPC;
+
+  inst.l = *pc++;
+
+  opcode = inst.inst.variant.b.opcode;
+
+  target = pc;
+
+  switch (opcode)
+    {
+    case 18:			/* Unconditional branch */
+
+      if (inst.inst.variant.b.aa) /* Absolute? */
+	target = 0;
+      target += inst.inst.variant.b.li;
+
+      break;
+    case 16:			/* Conditional branch */
+
+      if (!inst.inst.variant.bc.aa) /* Absolute? */
+	target = 0;
+      target += inst.inst.variant.bc.bd;
+
+      break;
+    case 19:			/* Cond. branch via ctr or lr reg */
+      switch (inst.inst.variant.bclr.type)
+	{
+	case 528:		/* ctr */
+	  target = (LONG *)frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedCTR;
+	  break;
+	case 16:		/* lr */
+	  target = (LONG *)frame->ExceptionState.u.SpecialRegistersEnumerated.CsavedLR;
+	  break;
+	}
+      break;
+    }
+
+  saved_inst = *pc;
+  mem_write (pc, breakpoint_insn, BREAKPOINT_SIZE);
+  saved_inst_pc = pc;
+
+  if (target != pc)
+    {
+      saved_target_inst = *target;
+      mem_write (target, breakpoint_insn, BREAKPOINT_SIZE);
+      saved_target_inst_pc = target;
+    }
+}
+
+/* Remove step breakpoints.  Returns non-zero if pc was at a step breakpoint,
+   zero otherwise.  This routine works even if there were no step breakpoints
+   set.  */
+
+int
+clear_step_traps (frame)
+     struct StackFrame *frame;
+{
+  int retcode;
+  LONG *pc = (LONG *)frame->ExceptionPC;
+
+  if (saved_inst_pc == pc || saved_target_inst_pc == pc)
+    retcode = 1;
+  else
+    retcode = 0;
+
+  if (saved_inst_pc)
+    {
+      mem_write (saved_inst_pc, saved_inst, BREAKPOINT_SIZE);
+      saved_inst_pc = 0;
+    }
+
+  if (saved_target_inst_pc)
+    {
+      mem_write (saved_target_inst_pc, saved_target_inst, BREAKPOINT_SIZE);
+      saved_target_inst_pc = 0;
+    }
+
+  return retcode;
+}
+
+void
+do_status (ptr, frame)
+     char *ptr;
+     struct StackFrame *frame;
+{
+  int sigval;
+
+  sigval = computeSignal (frame->ExceptionNumber);
+
+  sprintf (ptr, "T%02x", sigval);
+  ptr += 3;
+
+  sprintf (ptr, "%02x:", PC_REGNUM);
+  ptr = mem2hex (&frame->ExceptionPC, ptr + 3, 4, 0);
+  *ptr++ = ';';
+
+  sprintf (ptr, "%02x:", SP_REGNUM);
+  ptr = mem2hex (&frame->ExceptionState.CsavedRegs[SP_REGNUM], ptr + 3, 4, 0);
+  *ptr++ = ';';
+
+  sprintf (ptr, "%02x:", LR_REGNUM);
+  ptr = mem2hex (&frame->ExceptionState.CsavedRegs[LR_REGNUM], ptr + 3, 4, 0);
+  *ptr++ = ';';
+
+  *ptr = '\000';
+}