diff options
Diffstat (limited to 'gnu/usr.bin/binutils/gdb/ia64-linux-tdep.c')
| -rw-r--r-- | gnu/usr.bin/binutils/gdb/ia64-linux-tdep.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/gnu/usr.bin/binutils/gdb/ia64-linux-tdep.c b/gnu/usr.bin/binutils/gdb/ia64-linux-tdep.c new file mode 100644 index 00000000000..c3fa443a365 --- /dev/null +++ b/gnu/usr.bin/binutils/gdb/ia64-linux-tdep.c @@ -0,0 +1,114 @@ +/* Target-dependent code for the IA-64 for GDB, the GNU debugger. + + Copyright 2000, 2004 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. */ + +#include "defs.h" +#include "ia64-tdep.h" +#include "arch-utils.h" +#include "gdbcore.h" +#include "regcache.h" + +/* The sigtramp code is in a non-readable (executable-only) region + of memory called the ``gate page''. The addresses in question + were determined by examining the system headers. They are + overly generous to allow for different pages sizes. */ + +#define GATE_AREA_START 0xa000000000000100LL +#define GATE_AREA_END 0xa000000000020000LL + +/* Offset to sigcontext structure from frame of handler */ +#define IA64_LINUX_SIGCONTEXT_OFFSET 192 + +int +ia64_linux_in_sigtramp (CORE_ADDR pc, char *func_name) +{ + return (pc >= (CORE_ADDR) GATE_AREA_START && pc < (CORE_ADDR) GATE_AREA_END); +} + +/* IA-64 GNU/Linux specific function which, given a frame address and + a register number, returns the address at which that register may be + found. 0 is returned for registers which aren't stored in the the + sigcontext structure. */ + +CORE_ADDR +ia64_linux_sigcontext_register_address (CORE_ADDR sp, int regno) +{ + char buf[8]; + CORE_ADDR sigcontext_addr = 0; + + /* The address of the sigcontext area is found at offset 16 in the sigframe. */ + read_memory (sp + 16, buf, 8); + sigcontext_addr = extract_unsigned_integer (buf, 8); + + if (IA64_GR0_REGNUM <= regno && regno <= IA64_GR31_REGNUM) + return sigcontext_addr + 200 + 8 * (regno - IA64_GR0_REGNUM); + else if (IA64_BR0_REGNUM <= regno && regno <= IA64_BR7_REGNUM) + return sigcontext_addr + 136 + 8 * (regno - IA64_BR0_REGNUM); + else if (IA64_FR0_REGNUM <= regno && regno <= IA64_FR127_REGNUM) + return sigcontext_addr + 464 + 16 * (regno - IA64_FR0_REGNUM); + else + switch (regno) + { + case IA64_IP_REGNUM : + return sigcontext_addr + 40; + case IA64_CFM_REGNUM : + return sigcontext_addr + 48; + case IA64_PSR_REGNUM : + return sigcontext_addr + 56; /* user mask only */ + /* sc_ar_rsc is provided, from which we could compute bspstore, but + I don't think it's worth it. Anyway, if we want it, it's at offset + 64 */ + case IA64_BSP_REGNUM : + return sigcontext_addr + 72; + case IA64_RNAT_REGNUM : + return sigcontext_addr + 80; + case IA64_CCV_REGNUM : + return sigcontext_addr + 88; + case IA64_UNAT_REGNUM : + return sigcontext_addr + 96; + case IA64_FPSR_REGNUM : + return sigcontext_addr + 104; + case IA64_PFS_REGNUM : + return sigcontext_addr + 112; + case IA64_LC_REGNUM : + return sigcontext_addr + 120; + case IA64_PR_REGNUM : + return sigcontext_addr + 128; + default : + return 0; + } +} + +void +ia64_linux_write_pc (CORE_ADDR pc, ptid_t ptid) +{ + ia64_write_pc (pc, ptid); + + /* We must be careful with modifying the instruction-pointer: if we + just interrupt a system call, the kernel would ordinarily try to + restart it when we resume the inferior, which typically results + in SIGSEGV or SIGILL. We prevent this by clearing r10, which + will tell the kernel that r8 does NOT contain a valid error code + and hence it will skip system-call restart. + + The clearing of r10 is safe as long as ia64_write_pc() is only + called as part of setting up an inferior call. */ + write_register_pid (IA64_GR10_REGNUM, 0, ptid); +} |