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This adds a port to Linux on the IBM Z platform (a.k.a s390x). It only supports the 64-bit ABI. Most functionality is working and all the tests pass with the exception of the coredump tests*. Unwinding is only supported if DWARF unwind information is present. libunwind can't currently make use of the backchain (if present). The getcontext/setcontext functions only preserve/restore a subset of registers. Currently this only consists of callee-saved registers and some parameter registers. Vector registers and access registers are not saved (and aren't callee- saved) by getcontext and cannot currently be modified. They will however be restored unmodified after resuming a context from a signal handler. There is no special libunwind support for setjmp, the functionality is emulated using glibc (I think all the ports do this for modern Linux kernels). * Unwinding on s390x requires floating point register access which the coredump library doesn't currently support.
145 lines
3.8 KiB
C
145 lines
3.8 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2002-2004 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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Modified for s390x by Michael Munday <mike.munday@ibm.com>
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#ifndef LIBUNWIND_H
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#define LIBUNWIND_H
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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#include <sys/types.h>
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#include <inttypes.h>
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#include <ucontext.h>
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#define UNW_TARGET s390x
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#define UNW_TARGET_S390X 1
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#define _U_TDEP_QP_TRUE 0 /* see libunwind-dynamic.h */
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/* This needs to be big enough to accommodate "struct cursor", while
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leaving some slack for future expansion. Changing this value will
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require recompiling all users of this library. Stack allocation is
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relatively cheap and unwind-state copying is relatively rare, so we
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want to err on making it rather too big than too small. */
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#define UNW_TDEP_CURSOR_LEN 384
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typedef uint64_t unw_word_t;
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typedef int64_t unw_sword_t;
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typedef long double unw_tdep_fpreg_t;
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typedef enum
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{
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/* general purpose registers */
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UNW_S390X_R0,
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UNW_S390X_R1,
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UNW_S390X_R2,
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UNW_S390X_R3,
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UNW_S390X_R4,
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UNW_S390X_R5,
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UNW_S390X_R6,
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UNW_S390X_R7,
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UNW_S390X_R8,
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UNW_S390X_R9,
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UNW_S390X_R10,
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UNW_S390X_R11,
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UNW_S390X_R12,
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UNW_S390X_R13,
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UNW_S390X_R14,
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UNW_S390X_R15,
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/* floating point registers */
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UNW_S390X_F0,
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UNW_S390X_F1,
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UNW_S390X_F2,
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UNW_S390X_F3,
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UNW_S390X_F4,
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UNW_S390X_F5,
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UNW_S390X_F6,
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UNW_S390X_F7,
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UNW_S390X_F8,
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UNW_S390X_F9,
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UNW_S390X_F10,
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UNW_S390X_F11,
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UNW_S390X_F12,
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UNW_S390X_F13,
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UNW_S390X_F14,
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UNW_S390X_F15,
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/* PSW */
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UNW_S390X_IP,
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UNW_TDEP_LAST_REG = UNW_S390X_IP,
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/* TODO: access, vector registers */
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/* frame info (read-only) */
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UNW_S390X_CFA,
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UNW_TDEP_IP = UNW_S390X_IP,
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UNW_TDEP_SP = UNW_S390X_R15,
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/* TODO: placeholders */
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UNW_TDEP_EH = UNW_S390X_R0,
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}
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s390x_regnum_t;
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#define UNW_TDEP_NUM_EH_REGS 2 /* XXX Not sure what this means */
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typedef struct unw_tdep_save_loc
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{
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/* Additional target-dependent info on a save location. */
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char unused;
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}
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unw_tdep_save_loc_t;
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/* On s390x, we can directly use ucontext_t as the unwind context. */
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typedef ucontext_t unw_tdep_context_t;
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typedef struct
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{
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/* no s390x-specific auxiliary proc-info */
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char unused;
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}
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unw_tdep_proc_info_t;
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#include "libunwind-dynamic.h"
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#include "libunwind-common.h"
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#define unw_tdep_getcontext UNW_ARCH_OBJ(getcontext)
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#define unw_tdep_is_fpreg UNW_ARCH_OBJ(is_fpreg)
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extern int unw_tdep_getcontext (unw_tdep_context_t *);
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extern int unw_tdep_is_fpreg (int);
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#if defined(__cplusplus) || defined(c_plusplus)
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}
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#endif
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#endif /* LIBUNWIND_H */
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