Mercurial > hg > CbC > CbC_gcc
diff gcc/config/sparc/linux-unwind.h @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
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date | Fri, 12 Feb 2010 23:39:51 +0900 |
parents | a06113de4d67 |
children |
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--- a/gcc/config/sparc/linux-unwind.h Sun Feb 07 18:28:00 2010 +0900 +++ b/gcc/config/sparc/linux-unwind.h Fri Feb 12 23:39:51 2010 +0900 @@ -22,11 +22,9 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ - /* Do code reading to identify a signal frame, and set the frame state data appropriately. See unwind-dw2.c for the structs. */ -/* Handle multilib correctly. */ #if defined(__arch64__) /* 64-bit SPARC version */ @@ -37,53 +35,86 @@ _Unwind_FrameState *fs) { unsigned int *pc = context->ra; - long new_cfa, i; + long this_cfa = (long) context->cfa; + long new_cfa, ra_location, shifted_ra_location; long regs_off, fpu_save_off; - long this_cfa, fpu_save; + long fpu_save; + int i; - if (pc[0] != 0x82102065 /* mov NR_rt_sigreturn, %g1 */ - || pc[1] != 0x91d0206d) /* ta 0x6d */ + if (pc[0] != 0x82102065 /* mov NR_rt_sigreturn, %g1 */ + || pc[1] != 0x91d0206d) /* ta 0x6d */ return _URC_END_OF_STACK; + regs_off = 192 + 128; fpu_save_off = regs_off + (16 * 8) + (3 * 8) + (2 * 4); - this_cfa = (long) context->cfa; - new_cfa = *(long *)((context->cfa) + (regs_off + (14 * 8))); + + new_cfa = *(long *)(this_cfa + regs_off + (14 * 8)); new_cfa += 2047; /* Stack bias */ - fpu_save = *(long *)((this_cfa) + (fpu_save_off)); + fpu_save = *(long *)(this_cfa + fpu_save_off); fs->regs.cfa_how = CFA_REG_OFFSET; - fs->regs.cfa_reg = 14; - fs->regs.cfa_offset = new_cfa - (long) context->cfa; - for (i = 1; i < 16; ++i) + fs->regs.cfa_reg = __builtin_dwarf_sp_column (); + fs->regs.cfa_offset = new_cfa - this_cfa; + + 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; + fs->regs.reg[i].how = REG_SAVED_OFFSET; - fs->regs.reg[i].loc.offset = - this_cfa + (regs_off + (i * 8)) - new_cfa; + fs->regs.reg[i].loc.offset + = this_cfa + regs_off + (i * 8) - new_cfa; } - for (i = 0; i < 16; ++i) + for (i = 0; i < 16; i++) { fs->regs.reg[i + 16].how = REG_SAVED_OFFSET; - fs->regs.reg[i + 16].loc.offset = - this_cfa + (i * 8) - new_cfa; + fs->regs.reg[i + 16].loc.offset + = this_cfa + (i * 8) - new_cfa; } if (fpu_save) { - for (i = 0; i < 64; ++i) + for (i = 0; i < 64; i++) { if (i > 32 && (i & 0x1)) continue; fs->regs.reg[i + 32].how = REG_SAVED_OFFSET; - fs->regs.reg[i + 32].loc.offset = - (fpu_save + (i * 4)) - new_cfa; + fs->regs.reg[i + 32].loc.offset + = fpu_save + (i * 4) - new_cfa; } } - /* Stick return address into %g0, same trick Alpha uses. */ + + /* 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 + 17 * 8; + shifted_ra_location = this_cfa + regs_off + 19 * 8; /* Y register */ + *(long *)shifted_ra_location = *(long *)ra_location - 8; + fs->retaddr_column = 0; fs->regs.reg[0].how = REG_SAVED_OFFSET; - fs->regs.reg[0].loc.offset = - this_cfa + (regs_off + (16 * 8) + 8) - new_cfa; - fs->retaddr_column = 0; + fs->regs.reg[0].loc.offset = shifted_ra_location - new_cfa; + fs->signal_frame = 1; + return _URC_NO_REASON; } +#define MD_FROB_UPDATE_CONTEXT sparc64_frob_update_context + +static void +sparc64_frob_update_context (struct _Unwind_Context *context, + _Unwind_FrameState *fs) +{ + /* The column of %sp contains the old CFA, not the old value of %sp. + The CFA offset already comprises the stack bias so, when %sp is the + CFA register, we must avoid counting the stack bias twice. Do not + do that for signal frames as the offset is artificial for them. */ + if (fs->regs.cfa_reg == __builtin_dwarf_sp_column () + && fs->regs.cfa_how == CFA_REG_OFFSET + && fs->regs.cfa_offset != 0 + && !fs->signal_frame) + context->cfa -= 2047; +} + #else /* 32-bit SPARC version */ @@ -94,19 +125,23 @@ _Unwind_FrameState *fs) { unsigned int *pc = context->ra; - int new_cfa, i, oldstyle; + int this_cfa = (int) context->cfa; + int new_cfa, ra_location, shifted_ra_location; int regs_off, fpu_save_off; - int fpu_save, this_cfa; + int fpu_save; + int old_style, i; - if (pc[1] != 0x91d02010) /* ta 0x10 */ + if (pc[1] != 0x91d02010) /* ta 0x10 */ return _URC_END_OF_STACK; - if (pc[0] == 0x821020d8) /* mov NR_sigreturn, %g1 */ - oldstyle = 1; + + if (pc[0] == 0x821020d8) /* mov NR_sigreturn, %g1 */ + old_style = 1; else if (pc[0] == 0x82102065) /* mov NR_rt_sigreturn, %g1 */ - oldstyle = 0; + old_style = 0; else return _URC_END_OF_STACK; - if (oldstyle) + + if (old_style) { regs_off = 96; fpu_save_off = regs_off + (4 * 4) + (16 * 4); @@ -116,39 +151,51 @@ regs_off = 96 + 128; fpu_save_off = regs_off + (4 * 4) + (16 * 4) + (2 * 4); } - this_cfa = (int) context->cfa; - new_cfa = *(int *)((context->cfa) + (regs_off+(4*4)+(14 * 4))); - fpu_save = *(int *)((this_cfa) + (fpu_save_off)); + + new_cfa = *(int *)(this_cfa + regs_off + (4 * 4) + (14 * 4)); + fpu_save = *(int *)(this_cfa + fpu_save_off); fs->regs.cfa_how = CFA_REG_OFFSET; - fs->regs.cfa_reg = 14; - fs->regs.cfa_offset = new_cfa - (int) context->cfa; - for (i = 1; i < 16; ++i) + fs->regs.cfa_reg = __builtin_dwarf_sp_column (); + fs->regs.cfa_offset = new_cfa - this_cfa; + + for (i = 1; i < 16; i++) { - if (i == 14) + /* We never restore %sp as everything is purely CFA-based. */ + if ((unsigned int) i == __builtin_dwarf_sp_column ()) continue; + fs->regs.reg[i].how = REG_SAVED_OFFSET; - fs->regs.reg[i].loc.offset = - this_cfa + (regs_off+(4 * 4)+(i * 4)) - new_cfa; + fs->regs.reg[i].loc.offset + = this_cfa + regs_off + (4 * 4) + (i * 4) - new_cfa; } - for (i = 0; i < 16; ++i) + for (i = 0; i < 16; i++) { fs->regs.reg[i + 16].how = REG_SAVED_OFFSET; - fs->regs.reg[i + 16].loc.offset = - this_cfa + (i * 4) - new_cfa; + fs->regs.reg[i + 16].loc.offset + = this_cfa + (i * 4) - new_cfa; } if (fpu_save) { - for (i = 0; i < 32; ++i) + for (i = 0; i < 32; i++) { fs->regs.reg[i + 32].how = REG_SAVED_OFFSET; - fs->regs.reg[i + 32].loc.offset = - (fpu_save + (i * 4)) - new_cfa; + fs->regs.reg[i + 32].loc.offset + = fpu_save + (i * 4) - new_cfa; } } - /* Stick return address into %g0, same trick Alpha uses. */ + + /* 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; + shifted_ra_location = this_cfa + regs_off + 3 * 4; /* Y register */ + *(int *)shifted_ra_location = *(int *)ra_location - 8; + fs->retaddr_column = 0; fs->regs.reg[0].how = REG_SAVED_OFFSET; - fs->regs.reg[0].loc.offset = this_cfa+(regs_off+4)-new_cfa; - fs->retaddr_column = 0; + fs->regs.reg[0].loc.offset = shifted_ra_location - new_cfa; + fs->signal_frame = 1; + return _URC_NO_REASON; }