459 lines
19 KiB
C
459 lines
19 KiB
C
/* DWARF2 EH unwinding support for SPARC Solaris.
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Copyright (C) 2009 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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#if defined(__arch64__)
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#define MD_FALLBACK_FRAME_STATE_FOR sparc64_fallback_frame_state
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static _Unwind_Reason_Code
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sparc64_fallback_frame_state (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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void *new_cfa, *ra_location, *shifted_ra_location;
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int regs_off;
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int fpu_save_off;
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unsigned char fpu_save;
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int i;
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/* This is the observed pattern for the sigacthandler in Solaris 8. */
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unsigned int sigacthandler_sol8_pattern []
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= {0x9401400f, 0xca5aafa0, 0x913e2000, 0x892a3003,
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0xe0590005, 0x9fc40000, 0x9410001a, 0x80a6e008};
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/* This is the observed pattern for the sigacthandler in Solaris 9. */
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unsigned int sigacthandler_sol9_pattern []
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= {0xa33e2000, 0x00000000, 0x892c7003, 0x90100011,
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0xe0590005, 0x9fc40000, 0x9410001a, 0x80a46008};
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/* This is the observed pattern for the __sighndlr. */
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unsigned int sighndlr_pattern []
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= {0x9de3bf50, 0x90100018, 0x92100019, 0x9fc6c000,
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0x9410001a, 0x81c7e008, 0x81e80000};
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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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/* Look for the sigacthandler pattern. The pattern changes slightly
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in different versions of the operating system, so we skip the
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comparison against pc-(4*6) for Solaris 9. */
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if (( *(unsigned int *)(pc-(4*7)) == sigacthandler_sol8_pattern[0]
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&& *(unsigned int *)(pc-(4*6)) == sigacthandler_sol8_pattern[1]
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&& *(unsigned int *)(pc-(4*5)) == sigacthandler_sol8_pattern[2]
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&& *(unsigned int *)(pc-(4*4)) == sigacthandler_sol8_pattern[3]
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&& *(unsigned int *)(pc-(4*3)) == sigacthandler_sol8_pattern[4]
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&& *(unsigned int *)(pc-(4*2)) == sigacthandler_sol8_pattern[5]
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&& *(unsigned int *)(pc-(4*1)) == sigacthandler_sol8_pattern[6]
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&& *(unsigned int *)(pc-(4*0)) == sigacthandler_sol8_pattern[7] ) ||
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( *(unsigned int *)(pc-(4*7)) == sigacthandler_sol9_pattern[0]
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/* skip pc-(4*6) */
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&& *(unsigned int *)(pc-(4*5)) == sigacthandler_sol9_pattern[2]
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&& *(unsigned int *)(pc-(4*4)) == sigacthandler_sol9_pattern[3]
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&& *(unsigned int *)(pc-(4*3)) == sigacthandler_sol9_pattern[4]
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&& *(unsigned int *)(pc-(4*2)) == sigacthandler_sol9_pattern[5]
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&& *(unsigned int *)(pc-(4*1)) == sigacthandler_sol9_pattern[6]
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&& *(unsigned int *)(pc-(4*0)) == sigacthandler_sol9_pattern[7] ) )
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/* We need to move up two frames (the kernel frame and the handler
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frame). Minimum stack frame size is 176 bytes (128 + 48): 128
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bytes for spilling register window (16 extended words for in
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and local registers), and 6 extended words to store at least
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6 arguments to callees, The kernel frame and the sigacthandler
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both have this minimal stack. The ucontext_t structure is after
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this offset. */
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regs_off = 176 + 176;
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/* Look for the __sighndlr pattern. */
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else if ( *(unsigned int *)(pc-(4*5)) == sighndlr_pattern[0]
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&& *(unsigned int *)(pc-(4*4)) == sighndlr_pattern[1]
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&& *(unsigned int *)(pc-(4*3)) == sighndlr_pattern[2]
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&& *(unsigned int *)(pc-(4*2)) == sighndlr_pattern[3]
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&& *(unsigned int *)(pc-(4*1)) == sighndlr_pattern[4]
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&& *(unsigned int *)(pc-(4*0)) == sighndlr_pattern[5]
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&& *(unsigned int *)(pc+(4*1)) == sighndlr_pattern[6] )
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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 *)(this_cfa + 15*8) - 4);
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if (cuh_pattern == 0x9410001a || cuh_pattern == 0x94100013)
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/* This matches the call_user_handler pattern for Solaris 9 and
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for Solaris 8 running inside Solaris Containers respectively.
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We need to move up four frames (the kernel frame, the signal
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frame, the call_user_handler frame, the __sighndlr frame).
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Three of them have the minimum stack frame size (kernel,
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signal, and __sighndlr frames) of 176 bytes, and there is
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another with a stack frame of 304 bytes (the call_user_handler
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frame). The ucontext_t structure is after this offset. */
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regs_off = 176 + 176 + 176 + 304;
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else
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/* We need to move up three frames (the kernel frame, the
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sigacthandler frame, and the __sighndlr frame). The kernel
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frame has a stack frame size of 176, the __sighndlr frames of
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304 bytes, and there is a stack frame of 176 bytes for the
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sigacthandler frame. The ucontext_t structure is after this
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offset. */
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regs_off = 176 + 304 + 176;
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}
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/* Exit if the pattern at the return address does not match the
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previous three patterns. */
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else
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return _URC_END_OF_STACK;
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/* FPU information can be extracted from the ucontext_t structure
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that is the third argument for the signal handler, that is saved
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in the stack. There are 64 bytes between the beginning of the
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ucontext_t argument of the signal handler and the uc_mcontext
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field. There are 176 bytes between the beginning of uc_mcontext
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and the beginning of the fpregs field. */
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fpu_save_off = regs_off + (8*10) + 176;
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/* The fpregs field contains 32 extended words at the beginning that
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contain the fpu state. Then there are 2 extended words and two
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bytes. */
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fpu_save = *(unsigned char *)(this_cfa + fpu_save_off + (8*32) + (2*8) + 2);
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/* We need to get the frame pointer for the kernel frame that
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executes when the signal is raised. This frame is just the
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following to the application code that generated the signal, so
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that the later's stack pointer is the former's frame pointer.
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The stack pointer for the interrupted application code can be
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calculated from the ucontext_t structure (third argument for the
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signal handler) that is saved in the stack. There are 10 words
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between the beginning of the ucontext_t argument of the signal
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handler and the uc_mcontext.gregs field that contains the
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registers saved by the signal handler. */
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new_cfa = *(void **)(this_cfa + regs_off + (8*10) + (REG_SP*8));
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/* The frame address is %sp + STACK_BIAS in 64-bit mode. */
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new_cfa += 2047;
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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 - this_cfa;
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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
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= this_cfa + regs_off + (8*10) + ((REG_Y+i)*8) - 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*8;
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}
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/* Check whether we need to restore fpu registers. */
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if (fpu_save)
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{
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for (i = 0; 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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= this_cfa + fpu_save_off + (i*4) - new_cfa;
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}
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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 = this_cfa + regs_off + (8*10) + (REG_PC*8);
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shifted_ra_location = this_cfa + regs_off + (8*10) + (REG_Y*8);
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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 = shifted_ra_location - new_cfa;
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fs->signal_frame = 1;
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return _URC_NO_REASON;
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}
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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. Do not
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do that for signal frames as the offset is artificial for them. */
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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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&& !fs->signal_frame)
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context->cfa -= 2047;
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}
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#else
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#define MD_FALLBACK_FRAME_STATE_FOR sparc_fallback_frame_state
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static _Unwind_Reason_Code
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sparc_fallback_frame_state (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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void *new_cfa, *ra_location, *shifted_ra_location;
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int regs_off;
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int fpu_save_off;
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unsigned char fpu_save;
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int i;
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/* This is the observed pattern for the sigacthandler. */
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unsigned int sigacthandler_pattern []
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= {0x9602400f, 0x92100019, 0x00000000, 0x912e2002,
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0xe002000a, 0x90100018, 0x9fc40000, 0x9410001a,
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0x80a62008};
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/* This is the observed pattern for the __libthread_segvhdlr. */
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unsigned int segvhdlr_pattern []
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= {0x94102000, 0xe007bfe4, 0x9010001c, 0x92100019,
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0x9fc40000, 0x9410001a, 0x81c7e008, 0x81e80000,
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0x80a26000};
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/* This is the observed pattern for the __sighndlr. */
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unsigned int sighndlr_pattern []
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= {0x9de3bfa0, 0x90100018, 0x92100019, 0x9fc6c000,
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0x9410001a, 0x81c7e008, 0x81e80000};
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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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/* Look for the sigacthandler pattern. The pattern changes slightly
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in different versions of the operating system, so we skip the
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comparison against pc-(4*6). */
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if ( *(unsigned int *)(pc-(4*8)) == sigacthandler_pattern[0]
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&& *(unsigned int *)(pc-(4*7)) == sigacthandler_pattern[1]
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/* skip pc-(4*6) */
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&& *(unsigned int *)(pc-(4*5)) == sigacthandler_pattern[3]
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&& *(unsigned int *)(pc-(4*4)) == sigacthandler_pattern[4]
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&& *(unsigned int *)(pc-(4*3)) == sigacthandler_pattern[5]
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&& *(unsigned int *)(pc-(4*2)) == sigacthandler_pattern[6]
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&& *(unsigned int *)(pc-(4*1)) == sigacthandler_pattern[7]
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&& *(unsigned int *)(pc-(4*0)) == sigacthandler_pattern[8] )
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/* We need to move up two frames (the kernel frame and the handler
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frame). Minimum stack frame size is 96 bytes (64 + 4 + 24): 64
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bytes for spilling register window (16 words for in and local
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registers), 4 bytes for a pointer to space for callees
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returning structs, and 24 bytes to store at least six argument
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to callees. The ucontext_t structure is after this offset. */
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regs_off = 96 + 96;
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/* Look for the __libthread_segvhdlr pattern. */
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else if ( *(unsigned int *)(pc-(4*6)) == segvhdlr_pattern[0]
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&& *(unsigned int *)(pc-(4*5)) == segvhdlr_pattern[1]
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&& *(unsigned int *)(pc-(4*4)) == segvhdlr_pattern[2]
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&& *(unsigned int *)(pc-(4*3)) == segvhdlr_pattern[3]
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&& *(unsigned int *)(pc-(4*2)) == segvhdlr_pattern[4]
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&& *(unsigned int *)(pc-(4*1)) == segvhdlr_pattern[5]
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&& *(unsigned int *)(pc-(4*0)) == segvhdlr_pattern[6]
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&& *(unsigned int *)(pc+(4*1)) == segvhdlr_pattern[7]
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&& *(unsigned int *)(pc+(4*2)) == segvhdlr_pattern[8] )
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/* We need to move up four frames (the kernel frame, the
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sigacthandler frame, the __sighndlr frame, and the
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__libthread_segvhdlr). Two of them have the minimum
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stack frame size (kernel and __sighndlr frames) of 96 bytes,
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other has a stack frame of 216 bytes (the sigacthandler frame),
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and there is another with a stack frame of 128 bytes (the
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__libthread_segvhdlr). The ucontext_t structure is after this
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offset. */
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regs_off = 96 + 96 + 128 + 216;
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/* Look for the __sighndlr pattern. */
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else if ( *(unsigned int *)(pc-(4*5)) == sighndlr_pattern[0]
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&& *(unsigned int *)(pc-(4*4)) == sighndlr_pattern[1]
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&& *(unsigned int *)(pc-(4*3)) == sighndlr_pattern[2]
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&& *(unsigned int *)(pc-(4*2)) == sighndlr_pattern[3]
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&& *(unsigned int *)(pc-(4*1)) == sighndlr_pattern[4]
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&& *(unsigned int *)(pc-(4*0)) == sighndlr_pattern[5]
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&& *(unsigned int *)(pc+(4*1)) == sighndlr_pattern[6] )
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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 *)(this_cfa + 15*4) - 4);
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if (cuh_pattern == 0xd407a04c)
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/* This matches the call_user_handler pattern for Solaris 10.
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We need to move up three frames (the kernel frame, the
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call_user_handler frame, the __sighndlr frame). Two of them
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have the minimum stack frame size (kernel and __sighndlr
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frames) of 96 bytes, and there is another with a stack frame
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of 160 bytes (the call_user_handler frame). The ucontext_t
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structure is after this offset. */
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regs_off = 96 + 96 + 160;
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else if (cuh_pattern == 0x9410001a || cuh_pattern == 0x9410001b)
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/* This matches the call_user_handler pattern for Solaris 9 and
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for Solaris 8 running inside Solaris Containers respectively.
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We need to move up four frames (the kernel frame, the signal
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frame, the call_user_handler frame, the __sighndlr frame).
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Three of them have the minimum stack frame size (kernel,
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signal, and __sighndlr frames) of 96 bytes, and there is
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another with a stack frame of 160 bytes (the call_user_handler
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frame). The ucontext_t structure is after this offset. */
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regs_off = 96 + 96 + 96 + 160;
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else
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/* We need to move up three frames (the kernel frame, the
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sigacthandler frame, and the __sighndlr frame). Two of them
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have the minimum stack frame size (kernel and __sighndlr
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frames) of 96 bytes, and there is another with a stack frame
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of 216 bytes (the sigacthandler frame). The ucontext_t
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structure is after this offset. */
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regs_off = 96 + 96 + 216;
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}
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/* Exit if the pattern at the return address does not match the
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previous three patterns. */
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else
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return _URC_END_OF_STACK;
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/* FPU information can be extracted from the ucontext_t structure
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that is the third argument for the signal handler, that is saved
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in the stack. There are 10 words between the beginning of the
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ucontext_t argument of the signal handler and the uc_mcontext
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field. There are 80 bytes between the beginning of uc_mcontext
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and the beginning of the fpregs field. */
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fpu_save_off = regs_off + (4*10) + (4*20);
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/* The fpregs field contains 32 words at the beginning that contain
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the fpu state. Then there are 2 words and two bytes. */
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fpu_save = *(unsigned char *)(this_cfa + fpu_save_off + (4*32) + (2*4) + 2);
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/* We need to get the frame pointer for the kernel frame that
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executes when the signal is raised. This frame is just the
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following to the application code that generated the signal, so
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that the later's stack pointer is the former's frame pointer.
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The stack pointer for the interrupted application code can be
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calculated from the ucontext_t structure (third argument for the
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signal handler) that is saved in the stack. There are 10 words
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between the beginning of the ucontext_t argument of the signal
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handler and the uc_mcontext.gregs field that contains the
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registers saved by the signal handler. */
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new_cfa = *(void **)(this_cfa + regs_off + (4*10) + (REG_SP*4));
|
|
fs->regs.cfa_how = CFA_REG_OFFSET;
|
|
fs->regs.cfa_reg = __builtin_dwarf_sp_column ();
|
|
fs->regs.cfa_offset = new_cfa - this_cfa;
|
|
|
|
/* Restore global and out registers (in this order) from the
|
|
ucontext_t structure, uc_mcontext.gregs field. */
|
|
for (i = 1; i < 16; i++)
|
|
{
|
|
/* We never restore %sp as everything is purely CFA-based. */
|
|
if ((unsigned int) i == __builtin_dwarf_sp_column ())
|
|
continue;
|
|
|
|
/* First the global registers and then the out registers */
|
|
fs->regs.reg[i].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[i].loc.offset
|
|
= this_cfa + regs_off + (4*10) + ((REG_Y+i)*4) - new_cfa;
|
|
}
|
|
|
|
/* Just above the stack pointer there are 16 words in which the
|
|
register window (in and local registers) was saved. */
|
|
for (i = 0; i < 16; i++)
|
|
{
|
|
fs->regs.reg[i + 16].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[i + 16].loc.offset = i*4;
|
|
}
|
|
|
|
/* Check whether we need to restore fpu registers. */
|
|
if (fpu_save)
|
|
{
|
|
for (i = 0; i < 32; i++)
|
|
{
|
|
fs->regs.reg[i + 32].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[i + 32].loc.offset
|
|
= this_cfa + fpu_save_off + (i*4) - new_cfa;
|
|
}
|
|
}
|
|
|
|
/* State the rules to find the kernel's code "return address", which is
|
|
the address of the active instruction when the signal was caught.
|
|
On the SPARC, since RETURN_ADDR_OFFSET (essentially 8) is defined, we
|
|
need to preventively subtract it from the purported return address. */
|
|
ra_location = this_cfa + regs_off + (4*10) + (REG_PC*4);
|
|
shifted_ra_location = this_cfa + regs_off + (4*10) + (REG_Y*4);
|
|
*(void **)shifted_ra_location = *(void **)ra_location - 8;
|
|
fs->retaddr_column = 0;
|
|
fs->regs.reg[0].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[0].loc.offset = shifted_ra_location - new_cfa;
|
|
fs->signal_frame = 1;
|
|
|
|
return _URC_NO_REASON;
|
|
};
|
|
|
|
#endif
|