216 lines
6.7 KiB
C
216 lines
6.7 KiB
C
/* DWARF2 EH unwinding support for SPARC Linux.
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Copyright (C) 2004-2020 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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#if defined(__arch64__)
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#undef STACK_BIAS
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#define STACK_BIAS 2047
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/* 64-bit SPARC version */
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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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unsigned int *pc = context->ra;
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long this_cfa = (long) context->cfa;
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long new_cfa, ra_location, shifted_ra_location;
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long regs_off, fpu_save_off;
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long fpu_save;
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int i;
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if (pc[0] != 0x82102065 /* mov NR_rt_sigreturn, %g1 */
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|| pc[1] != 0x91d0206d) /* ta 0x6d */
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return _URC_END_OF_STACK;
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regs_off = 192 + 128;
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fpu_save_off = regs_off + (16 * 8) + (3 * 8) + (2 * 4);
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new_cfa = *(long *)(this_cfa + regs_off + (14 * 8));
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/* The frame address is %sp + STACK_BIAS in 64-bit mode. */
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new_cfa += STACK_BIAS;
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fpu_save = *(long *)(this_cfa + fpu_save_off);
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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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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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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 + (i * 8) - new_cfa;
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}
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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
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= this_cfa + (i * 8) - new_cfa;
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}
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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 & 0x1))
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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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= fpu_save + (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 + 17 * 8;
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shifted_ra_location = this_cfa + regs_off + 19 * 8; /* Y register */
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*(long *)shifted_ra_location = *(long *)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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{
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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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/* 32-bit SPARC version */
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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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unsigned int *pc = context->ra;
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int this_cfa = (int) context->cfa;
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int new_cfa, ra_location, shifted_ra_location;
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int regs_off, fpu_save_off;
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int fpu_save;
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int old_style, i;
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if (pc[1] != 0x91d02010) /* ta 0x10 */
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return _URC_END_OF_STACK;
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if (pc[0] == 0x821020d8) /* mov NR_sigreturn, %g1 */
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old_style = 1;
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else if (pc[0] == 0x82102065) /* mov NR_rt_sigreturn, %g1 */
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old_style = 0;
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else
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return _URC_END_OF_STACK;
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if (old_style)
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{
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regs_off = 96;
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fpu_save_off = regs_off + (4 * 4) + (16 * 4);
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}
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else
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{
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regs_off = 96 + 128;
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fpu_save_off = regs_off + (4 * 4) + (16 * 4) + (2 * 4);
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}
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new_cfa = *(int *)(this_cfa + regs_off + (4 * 4) + (14 * 4));
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fpu_save = *(int *)(this_cfa + fpu_save_off);
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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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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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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 + (4 * 4) + (i * 4) - new_cfa;
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}
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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
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= this_cfa + (i * 4) - new_cfa;
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}
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if (fpu_save)
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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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= fpu_save + (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 + 4;
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shifted_ra_location = this_cfa + regs_off + 3 * 4; /* Y register */
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*(int *)shifted_ra_location = *(int *)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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#endif
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