/* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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"); } }