aboutsummaryrefslogtreecommitdiff
path: root/contrib/gcc/config/rs6000/linux-unwind.h
diff options
context:
space:
mode:
Diffstat (limited to 'contrib/gcc/config/rs6000/linux-unwind.h')
-rw-r--r--contrib/gcc/config/rs6000/linux-unwind.h348
1 files changed, 0 insertions, 348 deletions
diff --git a/contrib/gcc/config/rs6000/linux-unwind.h b/contrib/gcc/config/rs6000/linux-unwind.h
deleted file mode 100644
index 6a59a544b172..000000000000
--- a/contrib/gcc/config/rs6000/linux-unwind.h
+++ /dev/null
@@ -1,348 +0,0 @@
-/* DWARF2 EH unwinding support for PowerPC and PowerPC64 Linux.
- Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
-
- This file is part of GCC.
-
- GCC is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 2, or (at your
- option) any later version.
-
- In addition to the permissions in the GNU General Public License,
- the Free Software Foundation gives you unlimited permission to link
- the compiled version of this file with other programs, and to
- distribute those programs without any restriction coming from the
- use of this file. (The General Public License restrictions do
- apply in other respects; for example, they cover modification of
- the file, and distribution when not linked into another program.)
-
- GCC is distributed in the hope that it will be useful, but WITHOUT
- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
- License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GCC; see the file COPYING. If not, write to the
- Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
- MA 02110-1301, USA. */
-
-/* This file defines our own versions of various kernel and user
- structs, so that system headers are not needed, which otherwise
- can make bootstrapping a new toolchain difficult. Do not use
- these structs elsewhere; Many fields are missing, particularly
- from the end of the structures. */
-
-struct gcc_vregs
-{
- __attribute__ ((vector_size (16))) int vr[32];
-#ifdef __powerpc64__
- unsigned int pad1[3];
- unsigned int vscr;
- unsigned int vsave;
- unsigned int pad2[3];
-#else
- unsigned int vsave;
- unsigned int pad[2];
- unsigned int vscr;
-#endif
-};
-
-struct gcc_regs
-{
- unsigned long gpr[32];
- unsigned long nip;
- unsigned long msr;
- unsigned long orig_gpr3;
- unsigned long ctr;
- unsigned long link;
- unsigned long xer;
- unsigned long ccr;
- unsigned long softe;
- unsigned long trap;
- unsigned long dar;
- unsigned long dsisr;
- unsigned long result;
- unsigned long pad1[4];
- double fpr[32];
- unsigned int pad2;
- unsigned int fpscr;
-#ifdef __powerpc64__
- struct gcc_vregs *vp;
-#else
- unsigned int pad3[2];
-#endif
- struct gcc_vregs vregs;
-};
-
-struct gcc_ucontext
-{
-#ifdef __powerpc64__
- unsigned long pad[28];
-#else
- unsigned long pad[12];
-#endif
- struct gcc_regs *regs;
- struct gcc_regs rsave;
-};
-
-#ifdef __powerpc64__
-
-enum { SIGNAL_FRAMESIZE = 128 };
-
-/* If PC is at a sigreturn trampoline, return a pointer to the
- regs. Otherwise return NULL. */
-
-static struct gcc_regs *
-get_regs (struct _Unwind_Context *context)
-{
- const unsigned char *pc = context->ra;
-
- /* addi r1, r1, 128; li r0, 0x0077; sc (sigreturn) */
- /* addi r1, r1, 128; li r0, 0x00AC; sc (rt_sigreturn) */
- if (*(unsigned int *) (pc + 0) != 0x38210000 + SIGNAL_FRAMESIZE
- || *(unsigned int *) (pc + 8) != 0x44000002)
- return NULL;
- if (*(unsigned int *) (pc + 4) == 0x38000077)
- {
- struct sigframe {
- char gap[SIGNAL_FRAMESIZE];
- unsigned long pad[7];
- struct gcc_regs *regs;
- } *frame = (struct sigframe *) context->cfa;
- return frame->regs;
- }
- else if (*(unsigned int *) (pc + 4) == 0x380000AC)
- {
- /* This works for 2.4 kernels, but not for 2.6 kernels with vdso
- because pc isn't pointing into the stack. Can be removed when
- no one is running 2.4.19 or 2.4.20, the first two ppc64
- kernels released. */
- struct rt_sigframe_24 {
- int tramp[6];
- void *pinfo;
- struct gcc_ucontext *puc;
- } *frame24 = (struct rt_sigframe_24 *) pc;
-
- /* Test for magic value in *puc of vdso. */
- if ((long) frame24->puc != -21 * 8)
- return frame24->puc->regs;
- else
- {
- /* This works for 2.4.21 and later kernels. */
- struct rt_sigframe {
- char gap[SIGNAL_FRAMESIZE];
- struct gcc_ucontext uc;
- unsigned long pad[2];
- int tramp[6];
- void *pinfo;
- struct gcc_ucontext *puc;
- } *frame = (struct rt_sigframe *) context->cfa;
- return frame->uc.regs;
- }
- }
- return NULL;
-}
-
-#else /* !__powerpc64__ */
-
-enum { SIGNAL_FRAMESIZE = 64 };
-
-static struct gcc_regs *
-get_regs (struct _Unwind_Context *context)
-{
- const unsigned char *pc = context->ra;
-
- /* li r0, 0x7777; sc (sigreturn old) */
- /* li r0, 0x0077; sc (sigreturn new) */
- /* li r0, 0x6666; sc (rt_sigreturn old) */
- /* li r0, 0x00AC; sc (rt_sigreturn new) */
- if (*(unsigned int *) (pc + 4) != 0x44000002)
- return NULL;
- if (*(unsigned int *) (pc + 0) == 0x38007777
- || *(unsigned int *) (pc + 0) == 0x38000077)
- {
- struct sigframe {
- char gap[SIGNAL_FRAMESIZE];
- unsigned long pad[7];
- struct gcc_regs *regs;
- } *frame = (struct sigframe *) context->cfa;
- return frame->regs;
- }
- else if (*(unsigned int *) (pc + 0) == 0x38006666
- || *(unsigned int *) (pc + 0) == 0x380000AC)
- {
- struct rt_sigframe {
- char gap[SIGNAL_FRAMESIZE + 16];
- char siginfo[128];
- struct gcc_ucontext uc;
- } *frame = (struct rt_sigframe *) context->cfa;
- return frame->uc.regs;
- }
- return NULL;
-}
-#endif
-
-/* Find an entry in the process auxiliary vector. The canonical way to
- test for VMX is to look at AT_HWCAP. */
-
-static long
-ppc_linux_aux_vector (long which)
-{
- /* __libc_stack_end holds the original stack passed to a process. */
- extern long *__libc_stack_end;
- long argc;
- char **argv;
- char **envp;
- struct auxv
- {
- long a_type;
- long a_val;
- } *auxp;
-
- /* The Linux kernel puts argc first on the stack. */
- argc = __libc_stack_end[0];
- /* Followed by argv, NULL terminated. */
- argv = (char **) __libc_stack_end + 1;
- /* Followed by environment string pointers, NULL terminated. */
- envp = argv + argc + 1;
- while (*envp++)
- continue;
- /* Followed by the aux vector, zero terminated. */
- for (auxp = (struct auxv *) envp; auxp->a_type != 0; ++auxp)
- if (auxp->a_type == which)
- return auxp->a_val;
- return 0;
-}
-
-/* Do code reading to identify a signal frame, and set the frame
- state data appropriately. See unwind-dw2.c for the structs. */
-
-#define MD_FALLBACK_FRAME_STATE_FOR ppc_fallback_frame_state
-
-static _Unwind_Reason_Code
-ppc_fallback_frame_state (struct _Unwind_Context *context,
- _Unwind_FrameState *fs)
-{
- static long hwcap = 0;
- struct gcc_regs *regs = get_regs (context);
- long new_cfa;
- int i;
-
- if (regs == NULL)
- return _URC_END_OF_STACK;
-
- new_cfa = regs->gpr[STACK_POINTER_REGNUM];
- fs->cfa_how = CFA_REG_OFFSET;
- fs->cfa_reg = STACK_POINTER_REGNUM;
- fs->cfa_offset = new_cfa - (long) context->cfa;
-
- for (i = 0; i < 32; i++)
- if (i != STACK_POINTER_REGNUM)
- {
- fs->regs.reg[i].how = REG_SAVED_OFFSET;
- fs->regs.reg[i].loc.offset = (long) &regs->gpr[i] - new_cfa;
- }
-
- fs->regs.reg[CR2_REGNO].how = REG_SAVED_OFFSET;
- fs->regs.reg[CR2_REGNO].loc.offset = (long) &regs->ccr - new_cfa;
-
- fs->regs.reg[LINK_REGISTER_REGNUM].how = REG_SAVED_OFFSET;
- fs->regs.reg[LINK_REGISTER_REGNUM].loc.offset = (long) &regs->link - new_cfa;
-
- fs->regs.reg[ARG_POINTER_REGNUM].how = REG_SAVED_OFFSET;
- fs->regs.reg[ARG_POINTER_REGNUM].loc.offset = (long) &regs->nip - new_cfa;
- fs->retaddr_column = ARG_POINTER_REGNUM;
- fs->signal_frame = 1;
-
- if (hwcap == 0)
- {
- hwcap = ppc_linux_aux_vector (16);
- /* These will already be set if we found AT_HWCAP. A nonzero
- value stops us looking again if for some reason we couldn't
- find AT_HWCAP. */
-#ifdef __powerpc64__
- hwcap |= 0xc0000000;
-#else
- hwcap |= 0x80000000;
-#endif
- }
-
- /* If we have a FPU... */
- if (hwcap & 0x08000000)
- for (i = 0; i < 32; i++)
- {
- fs->regs.reg[i + 32].how = REG_SAVED_OFFSET;
- fs->regs.reg[i + 32].loc.offset = (long) &regs->fpr[i] - new_cfa;
- }
-
- /* If we have a VMX unit... */
- if (hwcap & 0x10000000)
- {
- struct gcc_vregs *vregs;
-#ifdef __powerpc64__
- vregs = regs->vp;
-#else
- vregs = &regs->vregs;
-#endif
- if (regs->msr & (1 << 25))
- {
- for (i = 0; i < 32; i++)
- {
- fs->regs.reg[i + FIRST_ALTIVEC_REGNO].how = REG_SAVED_OFFSET;
- fs->regs.reg[i + FIRST_ALTIVEC_REGNO].loc.offset
- = (long) &vregs[i] - new_cfa;
- }
-
- fs->regs.reg[VSCR_REGNO].how = REG_SAVED_OFFSET;
- fs->regs.reg[VSCR_REGNO].loc.offset = (long) &vregs->vscr - new_cfa;
- }
-
- fs->regs.reg[VRSAVE_REGNO].how = REG_SAVED_OFFSET;
- fs->regs.reg[VRSAVE_REGNO].loc.offset = (long) &vregs->vsave - new_cfa;
- }
-
- return _URC_NO_REASON;
-}
-
-#define MD_FROB_UPDATE_CONTEXT frob_update_context
-
-static void
-frob_update_context (struct _Unwind_Context *context, _Unwind_FrameState *fs ATTRIBUTE_UNUSED)
-{
- const unsigned int *pc = (const unsigned int *) context->ra;
-
- /* Fix up for 2.6.12 - 2.6.16 Linux kernels that have vDSO, but don't
- have S flag in it. */
-#ifdef __powerpc64__
- /* addi r1, r1, 128; li r0, 0x0077; sc (sigreturn) */
- /* addi r1, r1, 128; li r0, 0x00AC; sc (rt_sigreturn) */
- if (pc[0] == 0x38210000 + SIGNAL_FRAMESIZE
- && (pc[1] == 0x38000077 || pc[1] == 0x380000AC)
- && pc[2] == 0x44000002)
- _Unwind_SetSignalFrame (context, 1);
-#else
- /* li r0, 0x7777; sc (sigreturn old) */
- /* li r0, 0x0077; sc (sigreturn new) */
- /* li r0, 0x6666; sc (rt_sigreturn old) */
- /* li r0, 0x00AC; sc (rt_sigreturn new) */
- if ((pc[0] == 0x38007777 || pc[0] == 0x38000077
- || pc[0] == 0x38006666 || pc[0] == 0x380000AC)
- && pc[1] == 0x44000002)
- _Unwind_SetSignalFrame (context, 1);
-#endif
-
-#ifdef __powerpc64__
- if (fs->regs.reg[2].how == REG_UNSAVED)
- {
- /* If the current unwind info (FS) does not contain explicit info
- saving R2, then we have to do a minor amount of code reading to
- figure out if it was saved. The big problem here is that the
- code that does the save/restore is generated by the linker, so
- we have no good way to determine at compile time what to do. */
- unsigned int *insn
- = (unsigned int *) _Unwind_GetGR (context, LINK_REGISTER_REGNUM);
- if (*insn == 0xE8410028)
- _Unwind_SetGRPtr (context, 2, context->cfa + 40);
- }
-#endif
-}
generated by cgit v1.2.3 (git 2.25.1) at 2025-03-31 15:32:23 +0000