+/* Definitions to make GDB run on a mips box under Mach 3.0
+ Copyright (C) 1992 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/* Mach specific routines for little endian mips (e.g. pmax)
+ * running Mach 3.0
+ *
+ * Author: Jukka Virtanen <jtv@hut.fi>
+ */
+
+#include "defs.h"
+#include "inferior.h"
+
+#include <stdio.h>
+
+#include <mach.h>
+#include <mach/message.h>
+#include <mach/exception.h>
+#include <mach_error.h>
+
+/* Find offsets to thread states at compile time.
+ * If your compiler does not grok this, check the hand coded
+ * offsets and use them.
+ */
+
+#if 1
+
+#define REG_OFFSET(reg) (int)(&((struct mips_thread_state *)0)->reg)
+#define CREG_OFFSET(reg) (int)(&((struct mips_float_state *)0)->reg)
+#define EREG_OFFSET(reg) (int)(&((struct mips_exc_state *)0)->reg)
+
+/* at reg_offset[i] is the offset to the mips_thread_state
+ * location where the gdb registers[i] is stored.
+ *
+ * -1 means mach does not save it anywhere.
+ */
+static int reg_offset[] =
+{
+ /* zero at v0 v1 */
+ -1, REG_OFFSET(r1), REG_OFFSET(r2), REG_OFFSET(r3),
+
+ /* a0 a1 a2 a3 */
+ REG_OFFSET(r4), REG_OFFSET(r5), REG_OFFSET(r6), REG_OFFSET(r7),
+
+ /* t0 t1 t2 t3 */
+ REG_OFFSET(r8), REG_OFFSET(r9), REG_OFFSET(r10), REG_OFFSET(r11),
+
+ /* t4 t5 t6 t7 */
+ REG_OFFSET(r12), REG_OFFSET(r13), REG_OFFSET(r14), REG_OFFSET(r15),
+
+ /* s0 s1 s2 s3 */
+ REG_OFFSET(r16), REG_OFFSET(r17), REG_OFFSET(r18), REG_OFFSET(r19),
+
+ /* s4 s5 s6 s7 */
+ REG_OFFSET(r20), REG_OFFSET(r21), REG_OFFSET(r22), REG_OFFSET(r23),
+
+ /* t8 t9 k0 k1 */
+ REG_OFFSET(r24), REG_OFFSET(r25), REG_OFFSET(r26), REG_OFFSET(r27),
+
+ /* gp sp s8(30) == fp(72) ra */
+ REG_OFFSET(r28), REG_OFFSET(r29), REG_OFFSET(r30), REG_OFFSET(r31),
+
+ /* sr(32) PS_REGNUM */
+ EREG_OFFSET(coproc_state),
+
+ /* lo(33) hi(34) */
+ REG_OFFSET(mdlo), REG_OFFSET(mdhi),
+
+ /* bad(35) cause(36) pc(37) */
+ EREG_OFFSET(address), EREG_OFFSET(cause), REG_OFFSET(pc),
+
+ /* f0(38) f1(39) f2(40) f3(41) */
+ CREG_OFFSET(r0), CREG_OFFSET(r1), CREG_OFFSET(r2), CREG_OFFSET(r3),
+ CREG_OFFSET(r4), CREG_OFFSET(r5), CREG_OFFSET(r6), CREG_OFFSET(r7),
+ CREG_OFFSET(r8), CREG_OFFSET(r9), CREG_OFFSET(r10), CREG_OFFSET(r11),
+ CREG_OFFSET(r12), CREG_OFFSET(r13), CREG_OFFSET(r14), CREG_OFFSET(r15),
+ CREG_OFFSET(r16), CREG_OFFSET(r17), CREG_OFFSET(r18), CREG_OFFSET(r19),
+ CREG_OFFSET(r20), CREG_OFFSET(r21), CREG_OFFSET(r22), CREG_OFFSET(r23),
+ CREG_OFFSET(r24), CREG_OFFSET(r25), CREG_OFFSET(r26), CREG_OFFSET(r27),
+ CREG_OFFSET(r28), CREG_OFFSET(r29), CREG_OFFSET(r30), CREG_OFFSET(r31),
+
+ /* fsr(70) fir(71) fp(72) == s8(30) */
+ CREG_OFFSET(csr), CREG_OFFSET(esr), REG_OFFSET(r30)
+};
+#else
+/* If the compiler does not grok the above defines */
+static int reg_offset[] =
+{
+/* mach_thread_state offsets: */
+ -1, 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56,
+ 60, 64, 68, 72, 76, 80, 84, 88, 92, 96,100,104, 108,112,116,120,
+/*sr, lo, hi,addr,cause,pc */
+ 8,124,128, 4, 0,132,
+/* mach_float_state offsets: */
+ 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60,
+ 64, 68, 72, 76, 80, 84, 88, 92, 96,100,104,108, 112,116,120,124,
+/*fsr,fir*/
+ 128,132,
+/* FP_REGNUM pseudo maps to s8==r30 in mach_thread_state */
+ 116
+};
+#endif
+
+/* Fetch COUNT contiguous registers from thread STATE starting from REGNUM
+ * Caller knows that the regs handled in one transaction are of same size.
+ */
+#define FETCH_REGS(state, regnum, count) \
+ memcpy (®isters[REGISTER_BYTE (regnum)], \
+ (char *)state+reg_offset[ regnum ], \
+ count*REGISTER_SIZE)
+
+/* Store COUNT contiguous registers to thread STATE starting from REGNUM */
+#define STORE_REGS(state, regnum, count) \
+ memcpy ((char *)state+reg_offset[ regnum ], \
+ ®isters[REGISTER_BYTE (regnum)], \
+ count*REGISTER_SIZE)
+
+#define REGS_ALL -1
+#define REGS_NORMAL 1
+#define REGS_EXC 2
+#define REGS_COP1 4
+
+/* Hardware regs that matches FP_REGNUM */
+#define MACH_FP_REGNUM 30
+
+/* Fech thread's registers. if regno == -1, fetch all regs */
+void
+fetch_inferior_registers (regno)
+ int regno;
+{
+ kern_return_t ret;
+
+ thread_state_data_t state;
+ struct mips_exc_state exc_state;
+
+ int stateCnt = MIPS_THREAD_STATE_COUNT;
+
+ int which_regs = 0; /* A bit mask */
+
+ if (! MACH_PORT_VALID (current_thread))
+ error ("fetch inferior registers: Invalid thread");
+
+ if (regno < -1 || regno >= NUM_REGS)
+ error ("invalid register %d supplied to fetch_inferior_registers", regno);
+
+ if (regno == -1)
+ which_regs = REGS_ALL;
+ else if (regno == ZERO_REGNUM)
+ {
+ int zero = 0;
+ supply_register (ZERO_REGNUM, &zero);
+ return;
+ }
+ else if ((ZERO_REGNUM < regno && regno < PS_REGNUM)
+ || regno == FP_REGNUM
+ || regno == LO_REGNUM
+ || regno == HI_REGNUM
+ || regno == PC_REGNUM)
+ which_regs = REGS_NORMAL;
+ else if (FP0_REGNUM <= regno && regno <= FCRIR_REGNUM)
+ which_regs = REGS_COP1 | REGS_EXC;
+ else
+ which_regs = REGS_EXC;
+
+ /* fetch regs saved to mips_thread_state */
+ if (which_regs & REGS_NORMAL)
+ {
+ ret = thread_get_state (current_thread,
+ MIPS_THREAD_STATE,
+ state,
+ &stateCnt);
+ CHK ("fetch inferior registers: thread_get_state", ret);
+
+ if (which_regs == REGS_NORMAL)
+ {
+ /* Fetch also FP_REGNUM if fetching MACH_FP_REGNUM and vice versa */
+ if (regno == MACH_FP_REGNUM || regno == FP_REGNUM)
+ {
+ supply_register (FP_REGNUM,
+ (char *)state+reg_offset[ MACH_FP_REGNUM ]);
+ supply_register (MACH_FP_REGNUM,
+ (char *)state+reg_offset[ MACH_FP_REGNUM ]);
+ }
+ else
+ supply_register (regno,
+ (char *)state+reg_offset[ regno ]);
+ return;
+ }
+
+ /* ZERO_REGNUM is always zero */
+ *(int *) registers = 0;
+
+ /* Copy thread saved regs 1..31 to gdb's reg value array
+ * Luckily, they are contiquous
+ */
+ FETCH_REGS (state, 1, 31);
+
+ /* Copy mdlo and mdhi */
+ FETCH_REGS (state, LO_REGNUM, 2);
+
+ /* Copy PC */
+ FETCH_REGS (state, PC_REGNUM, 1);
+
+ /* Mach 3.0 saves FP to MACH_FP_REGNUM.
+ * For some reason gdb wants to assign a pseudo register for it.
+ */
+ FETCH_REGS (state, FP_REGNUM, 1);
+ }
+
+ /* Read exc state. Also read if need to fetch floats */
+ if (which_regs & REGS_EXC)
+ {
+ stateCnt = MIPS_EXC_STATE_COUNT;
+ ret = thread_get_state (current_thread,
+ MIPS_EXC_STATE,
+ (thread_state_t) &exc_state,
+ &stateCnt);
+ CHK ("fetch inferior regs (exc): thread_get_state", ret);
+
+ /* We need to fetch exc_state to see if the floating
+ * state is valid for the thread.
+ */
+
+ /* cproc_state: Which coprocessors the thread uses */
+ supply_register (PS_REGNUM,
+ (char *)&exc_state+reg_offset[ PS_REGNUM ]);
+
+ if (which_regs == REGS_EXC || which_regs == REGS_ALL)
+ {
+ supply_register (BADVADDR_REGNUM,
+ (char *)&exc_state+reg_offset[ BADVADDR_REGNUM ]);
+
+ supply_register (CAUSE_REGNUM,
+ (char *)&exc_state+reg_offset[ CAUSE_REGNUM ]);
+ if (which_regs == REGS_EXC)
+ return;
+ }
+ }
+
+
+ if (which_regs & REGS_COP1)
+ {
+ /* If the thread does not have saved COPROC1, set regs to zero */
+
+ if (! (exc_state.coproc_state & MIPS_STATUS_USE_COP1))
+ bzero (®isters[ REGISTER_BYTE (FP0_REGNUM) ],
+ sizeof (struct mips_float_state));
+ else
+ {
+ stateCnt = MIPS_FLOAT_STATE_COUNT;
+ ret = thread_get_state (current_thread,
+ MIPS_FLOAT_STATE,
+ state,
+ &stateCnt);
+ CHK ("fetch inferior regs (floats): thread_get_state", ret);
+
+ if (regno != -1)
+ {
+ supply_register (regno,
+ (char *)state+reg_offset[ regno ]);
+ return;
+ }
+
+ FETCH_REGS (state, FP0_REGNUM, 34);
+ }
+ }
+
+ /* All registers are valid, if not returned yet */
+ registers_fetched ();
+}
+
+/* Store gdb's view of registers to the thread.
+ * All registers are always valid when entering here.
+ * @@ ahem, maybe that is too strict, we could validate the necessary ones
+ * here.
+ *
+ * Hmm. It seems that gdb set $reg=value command first reads everything,
+ * then sets the reg and then stores everything. -> we must make sure
+ * that the immutable registers are not changed by reading them first.
+ */
+
+void
+store_inferior_registers (regno)
+ register int regno;
+{
+ thread_state_data_t state;
+ kern_return_t ret;
+
+ if (! MACH_PORT_VALID (current_thread))
+ error ("store inferior registers: Invalid thread");
+
+ /* Check for read only regs.
+ * @@ If some of these is can be changed, fix this
+ */
+ if (regno == ZERO_REGNUM ||
+ regno == PS_REGNUM ||
+ regno == BADVADDR_REGNUM ||
+ regno == CAUSE_REGNUM ||
+ regno == FCRIR_REGNUM)
+ {
+ message ("You can not alter read-only register `%s'",
+ reg_names[ regno ]);
+ fetch_inferior_registers (regno);
+ return;
+ }
+
+ if (regno == -1)
+ {
+ /* Don't allow these to change */
+
+ /* ZERO_REGNUM */
+ *(int *)registers = 0;
+
+ fetch_inferior_registers (PS_REGNUM);
+ fetch_inferior_registers (BADVADDR_REGNUM);
+ fetch_inferior_registers (CAUSE_REGNUM);
+ fetch_inferior_registers (FCRIR_REGNUM);
+ }
+
+ if (regno == -1 || (ZERO_REGNUM < regno && regno <= PC_REGNUM))
+ {
+#if 1
+ /* Mach 3.0 saves thread's FP to MACH_FP_REGNUM.
+ * GDB wants assigns a pseudo register FP_REGNUM for frame pointer.
+ *
+ * @@@ Here I assume (!) that gdb's FP has the value that
+ * should go to threads frame pointer. If not true, this
+ * fails badly!!!!!
+ */
+ memcpy (®isters[REGISTER_BYTE (MACH_FP_REGNUM)],
+ ®isters[REGISTER_BYTE (FP_REGNUM)],
+ REGISTER_RAW_SIZE (FP_REGNUM));
+#endif
+
+ /* Save gdb's regs 1..31 to thread saved regs 1..31
+ * Luckily, they are contiquous
+ */
+ STORE_REGS (state, 1, 31);
+
+ /* Save mdlo, mdhi */
+ STORE_REGS (state, LO_REGNUM, 2);
+
+ /* Save PC */
+ STORE_REGS (state, PC_REGNUM, 1);
+
+ ret = thread_set_state (current_thread,
+ MIPS_THREAD_STATE,
+ state,
+ MIPS_FLOAT_STATE_COUNT);
+ CHK ("store inferior regs : thread_set_state", ret);
+ }
+
+ if (regno == -1 || regno >= FP0_REGNUM)
+ {
+ /* If thread has floating state, save it */
+ if (read_register (PS_REGNUM) & MIPS_STATUS_USE_COP1)
+ {
+ /* Do NOT save FCRIR_REGNUM */
+ STORE_REGS (state, FP0_REGNUM, 33);
+
+ ret = thread_set_state (current_thread,
+ MIPS_FLOAT_STATE,
+ state,
+ MIPS_FLOAT_STATE_COUNT);
+ CHK ("store inferior registers (floats): thread_set_state", ret);
+ }
+ else if (regno != -1)
+ message
+ ("Thread does not use floating point unit, floating regs not saved");
+ }
+}
projects / deliverable / binutils-gdb.git / blobdiff