mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-27 04:41:02 +08:00
178 lines
6.2 KiB
C
178 lines
6.2 KiB
C
/* Copyright (C) 1998, 1999, 2002, 2004, 2005 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#ifndef _SYS_UCONTEXT_H
|
|
#define _SYS_UCONTEXT_H 1
|
|
|
|
#include <features.h>
|
|
#include <signal.h>
|
|
|
|
/* We need the signal context definitions even if they are not used
|
|
included in <signal.h>. */
|
|
#include <bits/sigcontext.h>
|
|
|
|
#if __WORDSIZE == 32
|
|
|
|
/* Number of general registers. */
|
|
# define NGREG 48
|
|
|
|
/* Container for all general registers. */
|
|
typedef unsigned long gregset_t[NGREG];
|
|
|
|
/* Container for floating-point registers and status */
|
|
typedef struct _libc_fpstate
|
|
{
|
|
double fpregs[32];
|
|
double fpscr;
|
|
unsigned int _pad[2];
|
|
} fpregset_t;
|
|
|
|
/* Container for Altivec/VMX registers and status.
|
|
Needs to be aligned on a 16-byte boundary. */
|
|
typedef struct _libc_vrstate
|
|
{
|
|
unsigned int vrregs[32][4];
|
|
unsigned int vrsave;
|
|
unsigned int _pad[2];
|
|
unsigned int vscr;
|
|
} vrregset_t;
|
|
|
|
/* Context to describe whole processor state. */
|
|
typedef struct
|
|
{
|
|
gregset_t gregs;
|
|
fpregset_t fpregs;
|
|
vrregset_t vrregs __attribute__((__aligned__(16)));
|
|
} mcontext_t;
|
|
|
|
#else
|
|
|
|
/* For 64-bit kernels with Altivec support, a machine context is exactly
|
|
* a sigcontext. For older kernel (without Altivec) the sigcontext matches
|
|
* the mcontext upto but not including the v_regs field. For kernels that
|
|
* don't AT_HWCAP or return AT_HWCAP without PPC_FEATURE_HAS_ALTIVEC the
|
|
* v_regs field may not exit and should not be referenced. The v_regd field
|
|
* can be refernced safely only after verifying that PPC_FEATURE_HAS_ALTIVEC
|
|
* is set in AT_HWCAP. */
|
|
|
|
/* Number of general registers. */
|
|
# define NGREG 48 /* includes r0-r31, nip, msr, lr, etc. */
|
|
# define NFPREG 33 /* includes fp0-fp31 &fpscr. */
|
|
# define NVRREG 34 /* includes v0-v31, vscr, & vrsave in split vectors */
|
|
|
|
typedef unsigned long gregset_t[NGREG];
|
|
typedef double fpregset_t[NFPREG];
|
|
|
|
/* Container for Altivec/VMX Vector Status and Control Register. Only 32-bits
|
|
but can only be copied to/from a 128-bit vector register. So we allocated
|
|
a whole quadword speedup save/restore. */
|
|
typedef struct _libc_vscr
|
|
{
|
|
unsigned int __pad[3];
|
|
unsigned int vscr_word;
|
|
} vscr_t;
|
|
|
|
/* Container for Altivec/VMX registers and status.
|
|
Must to be aligned on a 16-byte boundary. */
|
|
typedef struct _libc_vrstate
|
|
{
|
|
unsigned int vrregs[32][4];
|
|
vscr_t vscr;
|
|
unsigned int vrsave;
|
|
unsigned int __pad[3];
|
|
} vrregset_t __attribute__((__aligned__(16)));
|
|
|
|
typedef struct {
|
|
unsigned long __unused[4];
|
|
int signal;
|
|
int __pad0;
|
|
unsigned long handler;
|
|
unsigned long oldmask;
|
|
struct pt_regs *regs;
|
|
gregset_t gp_regs;
|
|
fpregset_t fp_regs;
|
|
/*
|
|
* To maintain compatibility with current implementations the sigcontext is
|
|
* extended by appending a pointer (v_regs) to a quadword type (elf_vrreg_t)
|
|
* followed by an unstructured (vmx_reserve) field of 69 doublewords. This
|
|
* allows the array of vector registers to be quadword aligned independent of
|
|
* the alignment of the containing sigcontext or ucontext. It is the
|
|
* responsibility of the code setting the sigcontext to set this pointer to
|
|
* either NULL (if this processor does not support the VMX feature) or the
|
|
* address of the first quadword within the allocated (vmx_reserve) area.
|
|
*
|
|
* The pointer (v_regs) of vector type (elf_vrreg_t) is essentually
|
|
* an array of 34 quadword entries. The entries with
|
|
* indexes 0-31 contain the corresponding vector registers. The entry with
|
|
* index 32 contains the vscr as the last word (offset 12) within the
|
|
* quadword. This allows the vscr to be stored as either a quadword (since
|
|
* it must be copied via a vector register to/from storage) or as a word.
|
|
* The entry with index 33 contains the vrsave as the first word (offset 0)
|
|
* within the quadword.
|
|
*/
|
|
vrregset_t *v_regs;
|
|
long vmx_reserve[NVRREG+NVRREG+1];
|
|
} mcontext_t;
|
|
|
|
#endif
|
|
|
|
/* Userlevel context. */
|
|
typedef struct ucontext
|
|
{
|
|
unsigned long int uc_flags;
|
|
struct ucontext *uc_link;
|
|
stack_t uc_stack;
|
|
#if __WORDSIZE == 32
|
|
/*
|
|
* These fields are set up this way to maximize source and
|
|
* binary compatibility with code written for the old
|
|
* ucontext_t definition, which didn't include space for the
|
|
* registers.
|
|
*
|
|
* Different versions of the kernel have stored the registers on
|
|
* signal delivery at different offsets from the ucontext struct.
|
|
* Programs should thus use the uc_mcontext.uc_regs pointer to
|
|
* find where the registers are actually stored. The registers
|
|
* will be stored within the ucontext_t struct but not necessarily
|
|
* at a fixed address. As a side-effect, this lets us achieve
|
|
* 16-byte alignment for the register storage space if the
|
|
* Altivec registers are to be saved, without requiring 16-byte
|
|
* alignment on the whole ucontext_t.
|
|
*
|
|
* The uc_mcontext.regs field is included for source compatibility
|
|
* with programs written against the older ucontext_t definition,
|
|
* and its name should therefore not change. The uc_pad field
|
|
* is for binary compatibility with programs compiled against the
|
|
* old ucontext_t; it ensures that uc_mcontext.regs and uc_sigmask
|
|
* are at the same offset as previously.
|
|
*/
|
|
int uc_pad[7];
|
|
union uc_regs_ptr {
|
|
struct pt_regs *regs;
|
|
mcontext_t *uc_regs;
|
|
} uc_mcontext;
|
|
sigset_t uc_sigmask;
|
|
char uc_reg_space[sizeof(mcontext_t) + 12]; /* last for extensibility */
|
|
#else /* 64-bit */
|
|
sigset_t uc_sigmask;
|
|
mcontext_t uc_mcontext; /* last for extensibility */
|
|
#endif
|
|
} ucontext_t;
|
|
|
|
#endif /* sys/ucontext.h */
|