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-rw-r--r--gdb/nlm/ppc.c257
1 files changed, 257 insertions, 0 deletions
diff --git a/gdb/nlm/ppc.c b/gdb/nlm/ppc.c
new file mode 100644
index 00000000000..e68397bc96b
--- /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';
+}
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