367 lines
11 KiB
C
367 lines
11 KiB
C
/* DWARF2 EH unwinding support for SPARC Solaris.
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Copyright (C) 2009-2015 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* Do code reading to identify a signal frame, and set the frame
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state data appropriately. See unwind-dw2.c for the structs. */
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#include <ucontext.h>
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#include <sys/frame.h>
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#include <sys/stack.h>
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#ifdef __arch64__
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#define IS_SIGHANDLER sparc64_is_sighandler
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static int
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sparc64_is_sighandler (unsigned int *pc, void *cfa, int *nframes)
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{
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if (/* Solaris 8+ - multi-threaded
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----------------------------
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<__sighndlr>: save %sp, -176, %sp
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<__sighndlr+4>: mov %i0, %o0
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<__sighndlr+8>: mov %i1, %o1
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<__sighndlr+12>: call %i3
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<__sighndlr+16>: mov %i2, %o2
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<__sighndlr+20>: ret <--- PC
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<__sighndlr+24>: restore */
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pc[-5] == 0x9de3bf50
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&& pc[-4] == 0x90100018
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&& pc[-3] == 0x92100019
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&& pc[-2] == 0x9fc6c000
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&& pc[-1] == 0x9410001a
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&& pc[ 0] == 0x81c7e008
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&& pc[ 1] == 0x81e80000)
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{
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/* We have observed different calling frames among different
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versions of the operating system, so that we need to
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discriminate using the upper frame. We look for the return
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address of the caller frame (there is an offset of 15 double
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words between the frame address and the place where this return
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address is stored) in order to do some more pattern matching. */
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unsigned int cuh_pattern
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= *(unsigned int *)(*(unsigned long *)(cfa + 15*8) - 4);
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if (cuh_pattern == 0x92100019)
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/* This matches the call_user_handler pattern in Solaris 11
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libc.so.1:
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<call_user_handler+864>: mov %i1, %o1
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<call_user_handler+868>: call __sighndlr
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This is the same setup as for Solaris 10, see below. */
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*nframes = 3;
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else if (cuh_pattern == 0xd25fa7ef)
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{
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/* This matches the call_user_handler pattern in Solaris 10
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libc.so.1:
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<call_user_handler+988>: ldx [ %fp + 0x7ef ], %o1
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<call_user_handler+992>: call __sighndlr
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There are 2 cases so we look for the return address of the
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caller's caller frame in order to do more pattern matching. */
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unsigned long sah_address = *(unsigned long *)(cfa + 176 + 15*8);
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if (sah_address && *(unsigned int *)(sah_address - 4) == 0x92100019)
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/* We need to move up three frames:
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<signal handler> <-- context->cfa
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__sighndlr
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call_user_handler
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sigacthandler
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<kernel> */
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*nframes = 3;
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else
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/* The sigacthandler frame isn't present in the chain.
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We need to move up two frames:
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<signal handler> <-- context->cfa
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__sighndlr
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call_user_handler
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<kernel> */
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*nframes = 2;
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}
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else if (cuh_pattern == 0x9410001a || cuh_pattern == 0x9410001b)
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/* This matches the call_user_handler pattern in Solaris 9
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libthread.so.1:
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<call_user_handler+600>: mov %i2, %o2
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<call_user_handler+604>: call __sighndlr
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This is the same setup as for Solaris 10, see above. */
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*nframes = 3;
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return 1;
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}
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return 0;
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}
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#define MD_FALLBACK_FRAME_STATE_FOR sparc64_fallback_frame_state
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#define MD_FROB_UPDATE_CONTEXT sparc64_frob_update_context
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static void
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sparc64_frob_update_context (struct _Unwind_Context *context,
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_Unwind_FrameState *fs)
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{
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/* The column of %sp contains the old CFA, not the old value of %sp.
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The CFA offset already comprises the stack bias so, when %sp is the
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CFA register, we must avoid counting the stack bias twice. */
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if (fs->regs.cfa_reg == __builtin_dwarf_sp_column ()
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&& fs->regs.cfa_how == CFA_REG_OFFSET
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&& fs->regs.cfa_offset != 0)
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{
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long i;
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context->cfa -= STACK_BIAS;
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for (i = 0; i < __LIBGCC_DWARF_FRAME_REGISTERS__ + 1; ++i)
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if (fs->regs.reg[i].how == REG_SAVED_OFFSET)
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_Unwind_SetGRPtr (context, i,
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_Unwind_GetGRPtr (context, i) - STACK_BIAS);
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}
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}
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#else
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#define IS_SIGHANDLER sparc_is_sighandler
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static int
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sparc_is_sighandler (unsigned int *pc, void *cfa, int *nframes)
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{
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if(/* Solaris 8+ - multi-threaded
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----------------------------
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<__sighndlr>: save %sp, -96, %sp
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<__sighndlr+4>: mov %i0, %o0
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<__sighndlr+8>: mov %i1, %o1
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<__sighndlr+12>: call %i3
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<__sighndlr+16>: mov %i2, %o2
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<__sighndlr+20>: ret <--- PC
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<__sighndlr+24>: restore */
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pc[-5] == 0x9de3bfa0
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&& pc[-4] == 0x90100018
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&& pc[-3] == 0x92100019
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&& pc[-2] == 0x9fc6c000
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&& pc[-1] == 0x9410001a
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&& pc[ 0] == 0x81c7e008
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&& pc[ 1] == 0x81e80000)
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{
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/* We have observed different calling frames among different
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versions of the operating system, so that we need to
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discriminate using the upper frame. We look for the return
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address of the caller frame (there is an offset of 15 words
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between the frame address and the place where this return
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address is stored) in order to do some more pattern matching. */
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unsigned int cuh_pattern
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= *(unsigned int *)(*(unsigned int *)(cfa + 15*4) - 4);
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if (cuh_pattern == 0x92100019)
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/* This matches the call_user_handler pattern in Solaris 11
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libc.so.1:
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<call_user_handler+876>: mov %i1, %o1
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<call_user_handler+880>: call __sighndlr
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This is the same setup as for Solaris 10, see below. */
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*nframes = 3;
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else if (cuh_pattern == 0xd407a04c)
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{
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/* This matches the call_user_handler pattern in Solaris 10
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libc.so.1:
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<call_user_handler+948>: ld [ %fp + 0x4c ], %o2
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<call_user_handler+952>: call __sighndlr
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There are 2 cases so we look for the return address of the
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caller's caller frame in order to do more pattern matching. */
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unsigned int sah_address = *(unsigned int *)(cfa + 96 + 15*4);
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if (sah_address && *(unsigned int *)(sah_address - 4) == 0x92100019)
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/* We need to move up three frames:
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<signal handler> <-- context->cfa
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__sighndlr
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call_user_handler
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sigacthandler
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<kernel> */
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*nframes = 3;
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else
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/* The sigacthandler frame isn't present in the chain.
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We need to move up two frames:
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<signal handler> <-- context->cfa
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__sighndlr
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call_user_handler
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<kernel> */
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*nframes = 2;
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}
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else if (cuh_pattern == 0x9410001a || cuh_pattern == 0x9410001b)
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/* This matches the call_user_handler pattern in Solaris 9
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libthread.so.1:
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<call_user_handler+560>: mov %i2, %o2
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<call_user_handler+564>: call __sighndlr
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This is the same setup as for Solaris 10, see above. */
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*nframes = 3;
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return 1;
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}
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return 0;
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}
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#define MD_FALLBACK_FRAME_STATE_FOR sparc_fallback_frame_state
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#endif
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static _Unwind_Reason_Code
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MD_FALLBACK_FRAME_STATE_FOR (struct _Unwind_Context *context,
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_Unwind_FrameState *fs)
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{
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void *pc = context->ra;
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void *this_cfa = context->cfa;
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int nframes = 0;
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long new_cfa;
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void *ra_location, *shifted_ra_location;
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mcontext_t *mctx;
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int i;
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/* Deal with frame-less function from which a signal was raised. */
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if (_Unwind_IsSignalFrame (context))
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{
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/* The CFA is by definition unmodified in this case. */
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fs->regs.cfa_how = CFA_REG_OFFSET;
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fs->regs.cfa_reg = __builtin_dwarf_sp_column ();
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fs->regs.cfa_offset = 0;
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/* This is the canonical RA column. */
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fs->retaddr_column = 15;
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return _URC_NO_REASON;
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}
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/* Do some pattern matching at the return address. */
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if (IS_SIGHANDLER (pc, this_cfa, &nframes))
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{
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struct frame *fp = (struct frame *) this_cfa;
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struct handler_args {
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struct frame frwin;
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ucontext_t ucontext;
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} *handler_args;
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ucontext_t *ucp;
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/* this_cfa points into the frame after the saved frame pointer and
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saved pc (struct frame).
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The ucontext_t structure is in the kernel frame after a struct
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frame. Since the frame sizes vary even within OS releases, we
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need to walk the stack to get there. */
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for (i = 0; i < nframes; i++)
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fp = (struct frame *) ((char *)fp->fr_savfp + STACK_BIAS);
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handler_args = (struct handler_args *) fp;
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ucp = &handler_args->ucontext;
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mctx = &ucp->uc_mcontext;
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}
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else
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return _URC_END_OF_STACK;
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/* The frame address is %sp + STACK_BIAS in 64-bit mode. */
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new_cfa = mctx->gregs[REG_SP] + STACK_BIAS;
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fs->regs.cfa_how = CFA_REG_OFFSET;
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fs->regs.cfa_reg = __builtin_dwarf_sp_column ();
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fs->regs.cfa_offset = new_cfa - (long) this_cfa + STACK_BIAS;
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/* Restore global and out registers (in this order) from the
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ucontext_t structure, uc_mcontext.gregs field. */
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for (i = 1; i < 16; i++)
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{
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/* We never restore %sp as everything is purely CFA-based. */
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if ((unsigned int) i == __builtin_dwarf_sp_column ())
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continue;
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/* First the global registers and then the out registers. */
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fs->regs.reg[i].how = REG_SAVED_OFFSET;
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fs->regs.reg[i].loc.offset = (long)&mctx->gregs[REG_Y + i] - new_cfa;
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}
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/* Just above the stack pointer there are 16 extended words in which
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the register window (in and local registers) was saved. */
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for (i = 0; i < 16; i++)
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{
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fs->regs.reg[i + 16].how = REG_SAVED_OFFSET;
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fs->regs.reg[i + 16].loc.offset = i * sizeof(long);
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}
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/* Check whether we need to restore FPU registers. */
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if (mctx->fpregs.fpu_qcnt)
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{
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for (i = 0; i < 32; i++)
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{
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fs->regs.reg[i + 32].how = REG_SAVED_OFFSET;
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fs->regs.reg[i + 32].loc.offset
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= (long)&mctx->fpregs.fpu_fr.fpu_regs[i] - new_cfa;
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}
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#ifdef __arch64__
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/* For 64-bit, fpu_fr.fpu_dregs contains 32 instead of 16 doubles. */
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for (i = 32; i < 64; i++)
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{
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if (i > 32 && (i & 1))
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continue;
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fs->regs.reg[i + 32].how = REG_SAVED_OFFSET;
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fs->regs.reg[i + 32].loc.offset
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= (long)&mctx->fpregs.fpu_fr.fpu_dregs[i/2] - new_cfa;
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}
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#endif
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}
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/* State the rules to find the kernel's code "return address", which is
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the address of the active instruction when the signal was caught.
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On the SPARC, since RETURN_ADDR_OFFSET (essentially 8) is defined, we
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need to preventively subtract it from the purported return address. */
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ra_location = &mctx->gregs[REG_PC];
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shifted_ra_location = &mctx->gregs[REG_Y];
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*(void **)shifted_ra_location = *(void **)ra_location - 8;
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fs->retaddr_column = 0;
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fs->regs.reg[0].how = REG_SAVED_OFFSET;
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fs->regs.reg[0].loc.offset = (long)shifted_ra_location - new_cfa;
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/* SIGFPE for IEEE-754 exceptions is delivered after the faulting insn
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rather than before it, so don't set fs->signal_frame in that case.
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We test whether the cexc field of the FSR is zero. */
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if ((mctx->fpregs.fpu_fsr & 0x1f) == 0)
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fs->signal_frame = 1;
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return _URC_NO_REASON;
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}
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