1 /* Target-dependent code for the IA-64 for GDB, the GNU debugger. 2 3 Copyright 2000, 2004 Free Software Foundation, Inc. 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 "ia64-tdep.h" 24 #include "arch-utils.h" 25 #include "gdbcore.h" 26 #include "regcache.h" 27 28 /* The sigtramp code is in a non-readable (executable-only) region 29 of memory called the ``gate page''. The addresses in question 30 were determined by examining the system headers. They are 31 overly generous to allow for different pages sizes. */ 32 33 #define GATE_AREA_START 0xa000000000000100LL 34 #define GATE_AREA_END 0xa000000000020000LL 35 36 /* Offset to sigcontext structure from frame of handler */ 37 #define IA64_LINUX_SIGCONTEXT_OFFSET 192 38 39 int 40 ia64_linux_in_sigtramp (CORE_ADDR pc, char *func_name) 41 { 42 return (pc >= (CORE_ADDR) GATE_AREA_START && pc < (CORE_ADDR) GATE_AREA_END); 43 } 44 45 /* IA-64 GNU/Linux specific function which, given a frame address and 46 a register number, returns the address at which that register may be 47 found. 0 is returned for registers which aren't stored in the the 48 sigcontext structure. */ 49 50 CORE_ADDR 51 ia64_linux_sigcontext_register_address (CORE_ADDR sp, int regno) 52 { 53 char buf[8]; 54 CORE_ADDR sigcontext_addr = 0; 55 56 /* The address of the sigcontext area is found at offset 16 in the sigframe. */ 57 read_memory (sp + 16, buf, 8); 58 sigcontext_addr = extract_unsigned_integer (buf, 8); 59 60 if (IA64_GR0_REGNUM <= regno && regno <= IA64_GR31_REGNUM) 61 return sigcontext_addr + 200 + 8 * (regno - IA64_GR0_REGNUM); 62 else if (IA64_BR0_REGNUM <= regno && regno <= IA64_BR7_REGNUM) 63 return sigcontext_addr + 136 + 8 * (regno - IA64_BR0_REGNUM); 64 else if (IA64_FR0_REGNUM <= regno && regno <= IA64_FR127_REGNUM) 65 return sigcontext_addr + 464 + 16 * (regno - IA64_FR0_REGNUM); 66 else 67 switch (regno) 68 { 69 case IA64_IP_REGNUM : 70 return sigcontext_addr + 40; 71 case IA64_CFM_REGNUM : 72 return sigcontext_addr + 48; 73 case IA64_PSR_REGNUM : 74 return sigcontext_addr + 56; /* user mask only */ 75 /* sc_ar_rsc is provided, from which we could compute bspstore, but 76 I don't think it's worth it. Anyway, if we want it, it's at offset 77 64 */ 78 case IA64_BSP_REGNUM : 79 return sigcontext_addr + 72; 80 case IA64_RNAT_REGNUM : 81 return sigcontext_addr + 80; 82 case IA64_CCV_REGNUM : 83 return sigcontext_addr + 88; 84 case IA64_UNAT_REGNUM : 85 return sigcontext_addr + 96; 86 case IA64_FPSR_REGNUM : 87 return sigcontext_addr + 104; 88 case IA64_PFS_REGNUM : 89 return sigcontext_addr + 112; 90 case IA64_LC_REGNUM : 91 return sigcontext_addr + 120; 92 case IA64_PR_REGNUM : 93 return sigcontext_addr + 128; 94 default : 95 return 0; 96 } 97 } 98 99 void 100 ia64_linux_write_pc (CORE_ADDR pc, ptid_t ptid) 101 { 102 ia64_write_pc (pc, ptid); 103 104 /* We must be careful with modifying the instruction-pointer: if we 105 just interrupt a system call, the kernel would ordinarily try to 106 restart it when we resume the inferior, which typically results 107 in SIGSEGV or SIGILL. We prevent this by clearing r10, which 108 will tell the kernel that r8 does NOT contain a valid error code 109 and hence it will skip system-call restart. 110 111 The clearing of r10 is safe as long as ia64_write_pc() is only 112 called as part of setting up an inferior call. */ 113 write_register_pid (IA64_GR10_REGNUM, 0, ptid); 114 } 115