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author | Jan Kratochvil <jan.kratochvil@redhat.com> | 2013-12-17 18:49:54 +0100 |
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committer | Jan Kratochvil <jan.kratochvil@redhat.com> | 2013-12-18 13:01:05 +0100 |
commit | c6a41483f2986d5542c554981348f75b815ef9b1 (patch) | |
tree | afbd87ebb664bfe07a7d03790920fdbbc3be9e38 /backends/s390_initreg.c | |
parent | c8c610bcfb9e90ab2d43c019da7eaade7017baec (diff) | |
download | elfutils-c6a41483f2986d5542c554981348f75b815ef9b1.tar.gz |
unwinder: s390 and s390x
Signed-off-by: Jan Kratochvil <jan.kratochvil@redhat.com>
Diffstat (limited to 'backends/s390_initreg.c')
-rw-r--r-- | backends/s390_initreg.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/backends/s390_initreg.c b/backends/s390_initreg.c new file mode 100644 index 00000000..62a1531e --- /dev/null +++ b/backends/s390_initreg.c @@ -0,0 +1,87 @@ +/* Fetch live process registers from TID. + Copyright (C) 2013 Red Hat, Inc. + This file is part of elfutils. + + This file is free software; you can redistribute it and/or modify + it under the terms of either + + * the GNU Lesser General Public License as published by the Free + Software Foundation; either version 3 of the License, or (at + your option) any later version + + or + + * 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 + + or both in parallel, as here. + + elfutils 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 copies of the GNU General Public License and + the GNU Lesser General Public License along with this program. If + not, see <http://www.gnu.org/licenses/>. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include "system.h" +#include <assert.h> +#ifdef __s390__ +# include <sys/user.h> +# include <asm/ptrace.h> +# include <sys/ptrace.h> +#endif + +#define BACKEND s390_ +#include "libebl_CPU.h" + +bool +s390_set_initial_registers_tid (pid_t tid __attribute__ ((unused)), + ebl_tid_registers_t *setfunc __attribute__ ((unused)), + void *arg __attribute__ ((unused))) +{ +#ifndef __s390__ + return false; +#else /* __s390__ */ + struct user user_regs; + ptrace_area parea; + parea.process_addr = (uintptr_t) &user_regs; + parea.kernel_addr = 0; + parea.len = sizeof (user_regs); + if (ptrace (PTRACE_PEEKUSR_AREA, tid, &parea, NULL) != 0) + return false; + /* If we run as s390x we get the 64-bit registers of tid. + But -m31 executable seems to use only the 32-bit parts of its + registers so we ignore the upper half. */ + Dwarf_Word dwarf_regs[16]; + for (unsigned u = 0; u < 16; u++) + dwarf_regs[u] = user_regs.regs.gprs[u]; + if (! setfunc (0, 16, dwarf_regs, arg)) + return false; + /* Avoid conversion double -> integer. */ + eu_static_assert (sizeof user_regs.regs.fp_regs.fprs[0] + == sizeof dwarf_regs[0]); + for (unsigned u = 0; u < 16; u++) + dwarf_regs[u] = *((const __typeof (dwarf_regs[0]) *) + &user_regs.regs.fp_regs.fprs[u]); + if (! setfunc (16, 16, dwarf_regs, arg)) + return false; + dwarf_regs[0] = user_regs.regs.psw.addr; + return setfunc (-1, 1, dwarf_regs, arg); +#endif /* __s390__ */ +} + +void +s390_normalize_pc (Ebl *ebl __attribute__ ((unused)), Dwarf_Addr *pc) +{ + assert (ebl->class == ELFCLASS32); + + /* Clear S390 bit 31. */ + *pc &= (1U << 31) - 1; +} |