1 /* SPARC-specific portions of the RPC protocol for VxWorks. 2 3 Contributed by Wind River Systems. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 59 Temple Place - Suite 330, 20 Boston, MA 02111-1307, USA. */ 21 22 #include "defs.h" 23 #include "regcache.h" 24 25 #include "gdb_string.h" 26 27 #include "sparc-tdep.h" 28 29 #include "vx-share/ptrace.h" 30 #include "vx-share/regPacket.h" 31 32 #define SPARC_R_G1 (SPARC_R_G0 + SPARC_GREG_SIZE) 33 34 const struct sparc_gregset vxsparc_gregset = 35 { 36 SPARC_R_PSR, /* %psr */ 37 SPARC_R_PC, /* %pc */ 38 SPARC_R_NPC, /* %npc */ 39 SPARC_R_Y, /* %y */ 40 SPARC_R_WIM, /* %wim */ 41 SPARC_R_TBR, /* %tbr */ 42 SPARC_R_G1, /* %g1 */ 43 SPARC_R_I0 /* %l0 */ 44 }; 45 46 /* Flag set if target has an FPU. */ 47 48 extern int target_has_fp; 49 50 /* Generic register read/write routines in remote-vx.c. */ 51 52 extern void net_read_registers (); 53 extern void net_write_registers (); 54 55 /* Read a register or registers from the VxWorks target. REGNUM is 56 the register to read, or -1 for all; currently, it is ignored. 57 FIXME: Look at REGNUM to improve efficiency. */ 58 59 void 60 vx_read_register (int regnum) 61 { 62 struct regcache *regcache = current_regcache; 63 char gregs[SPARC_GREG_PLEN]; 64 char fpregs[SPARC_FPREG_PLEN]; 65 CORE_ADDR sp; 66 67 /* Get the general-purpose registers. */ 68 net_read_registers (gregs, SPARC_GREG_PLEN, PTRACE_GETREGS); 69 sparc32_supply_gregset (&vxsparc_gregset, regcache, -1, gregs); 70 71 /* If the target has floating-point registers, fetch them. 72 Otherwise, zero the floating-point register values in GDB's 73 register cache for good measure, even though we might not need 74 to. */ 75 if (target_has_fp) 76 net_read_registers (fpregs, SPARC_FPREG_PLEN, PTRACE_GETFPREGS); 77 else 78 memset (fpregs, 0, SPARC_FPREG_PLEN); 79 sparc32_supply_fpregset (regcache, -1, fpregs); 80 } 81 82 /* Store a register or registers into the VxWorks target. REGNUM is 83 the register to store, or -1 for all; currently, it is ignored. 84 FIXME: Look at REGNUM to improve efficiency. */ 85 86 void 87 vx_write_register (int regnum) 88 { 89 struct regcache *regcache = current_regcache; 90 char gregs[SPARC_GREG_PLEN]; 91 char fpregs[SPARC_FPREG_PLEN]; 92 int gregs_p = 1; 93 int fpregs_p = 1; 94 CORE_ADDR sp; 95 96 if (regnum != -1) 97 { 98 if ((SPARC_G0_REGNUM <= regnum && regnum <= SPARC_I7_REGNUM) 99 || (SPARC32_Y_REGNUM <= regnum && regnum <= SPARC32_NPC_REGNUM)) 100 fpregs_p = 0; 101 else 102 gregs_p = 0; 103 } 104 105 /* Store the general-purpose registers. */ 106 if (gregs_p) 107 { 108 sparc32_collect_gregset (&vxsparc_gregset, regcache, -1, gregs); 109 net_write_registers (gregs, SPARC_GREG_PLEN, PTRACE_SETREGS); 110 111 /* Deal with the stack regs. */ 112 if (regnum == -1 || regnum == SPARC_SP_REGNUM 113 || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM)) 114 { 115 ULONGEST sp; 116 117 regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp); 118 sparc_collect_rwindow (regcache, sp, regnum); 119 } 120 } 121 122 /* Store the floating-point registers if the target has them. */ 123 if (fpregs_p && target_has_fp) 124 { 125 sparc32_collect_fpregset (regcache, -1, fpregs); 126 net_write_registers (fpregs, SPARC_FPREG_PLEN, PTRACE_SETFPREGS); 127 } 128 } 129