+2001-04-07 Ulrich Drepper <drepper@redhat.com>
+
+ * sysdeps/unix/sysv/linux/i386/getcontext.S: New file.
+ * sysdeps/unix/sysv/linux/i386/setcontext.S: New file.
+ * sysdeps/unix/sysv/linux/i386/makecontext.S: New file.
+ * sysdeps/unix/sysv/linux/i386/swapcontext.S: New file.
+ * sysdeps/unix/sysv/linux/i386/ucontext_i.h: New file.
+ * sysdeps/unix/sysv/linux/i386/Dist: Add ucontext_i.h.
+
2001-04-07 Andreas Jaeger <aj@suse.de>
* sysdeps/ieee754/ldbl-96/e_j1l.c (__ieee754_y1l): Use sincos
sys/reg.h
sys/user.h
sys/vm86.h
+ucontext_i.h
--- /dev/null
+/* Create new context.
+ Copyright (C) 2001 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+
+ENTRY(__makecontext)
+ movl 4(%esp), %eax
+
+ /* Load the address of the function we are supposed to run. */
+ movl 8(%esp), %ecx
+
+ /* Compute the address of the stack. The information comes from
+ to us_stack element. */
+ movl oSS_SP(%eax), %edx
+ movl %ecx, oEIP(%eax)
+ addl oSS_SIZE(%eax), %edx
+
+ /* Put the next context on the new stack (from the uc_link
+ element). */
+ movl oLINK(%eax), %ecx
+ movl %ecx, -4(%edx)
+
+ /* Remember the number of parameters for the exit handler since
+ it has to remove them. We store the number in the EBX register
+ which the function we will call must preserve. */
+ movl 12(%esp), %ecx
+ movl %ecx, oEBX(%eax)
+
+ /* Make room on the new stack for the parameters. */
+ negl %ecx
+ leal -8(%edx,%ecx,4), %edx
+ negl %ecx
+ /* Store the future stack pointer. */
+ movl %edx, oESP(%eax)
+
+ /* Copy all the parameters. */
+ jecxz 2f
+1: movl 12(%esp,%ecx,4), %eax
+ movl %eax, (%edx,%ecx,4)
+ decl %ecx
+ jnz 1b
+2:
+
+ /* If the function we call returns we must continue with the
+ context which is given in the uc_link element. To do this
+ set the return address for the function the user provides
+ to a little bit of helper code which does the magic (see
+ below). */
+#ifdef PIC
+ call 1f
+1: popl %ecx
+ addl $L(exitcode)-1b, %ecx
+ movl %ecx, (%edx)
+#else
+ movl $L(exitcode), (%edx)
+#endif
+ /* 'makecontext' returns no value. */
+ ret
+
+ /* This is the helper code which gets called if a function which
+ is registered with 'makecontext' returns. In this case we
+ have to install the context listed in the uc_link element of
+ the context 'makecontext' manipulated at the time of the
+ 'makecontext' call. If the pointer is NULL the process must
+ terminate. */
+L(exitcode):
+ /* This removes the parameters passed to the function given to
+ 'makecontext' from the stack. EBX contains the number of
+ parameters (see above). */
+ leal (%esp,%ebx,4), %esp
+
+#ifdef PIC
+ call 1f
+1: popl %ebx
+ addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ebx
+#endif
+ popl %eax /* This is the next context. */
+ testl %eax, %eax
+ je 2f /* If it is zero exit. */
+
+ pushl %eax
+ call JUMPTARGET(__setcontext)
+ /* If this returns (which can happen if the syscall fails) we'll
+ exit the program with the return error value (-1). */
+
+2: pushl %eax
+ call JUMPTARGET(exit)
+ /* The 'exit' call should never return. In case it does cause
+ the process to terminate. */
+ hlt
+END(__makecontext)
+
+weak_alias(__makecontext, makecontext)
--- /dev/null
+/* Install given context.
+ Copyright (C) 2001 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+
+ENTRY(__setcontext)
+ /* Load address of the context data structure. */
+ movl 4(%esp), %eax
+
+ /* Get the current signal mask. Note that we preserve EBX in case
+ the system call fails and we return from the function with an
+ error. */
+ pushl %ebx
+ xorl %edx, %edx
+ leal oSIGMASK(%eax), %ecx
+ movl $SIG_SETMASK, %ebx
+ movl $__NR_sigprocmask, %eax
+ int $0x80
+ popl %ebx
+ cmpl $-4095, %eax /* Check %eax for error. */
+ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
+
+ /* EAX was modified, reload it. */
+ movl 4(%esp), %eax
+
+ /* Restore the floating-point context. Not the registers, only the
+ rest. */
+ movl oFPREGS(%eax), %ecx
+ fldenv (%ecx)
+
+ /* Restore the FS and GS segment registers. */
+ movl oGS(%eax), %edx
+ movl oFS(%eax), %ecx
+ movw %dx, %gs
+ movw %cx, %fs
+
+ /* Load the new stack pointer. */
+ movl oESP(%eax), %ecx
+ /* Make room for 8 registers and the return address. We will load
+ the values from the stack. */
+ subl $36, %ecx
+
+ /* Move the values of all the 32-bit registers (except ESP) on
+ the stack. This happens in the form the 'popa' instruction
+ expects it. Before this block put the address of the code
+ to execute. */
+ movl oEDI(%eax), %ebx
+ movl oESI(%eax), %edx
+ movl oEBP(%eax), %esi
+ movl oEBX(%eax), %edi
+ movl %ebx, (%ecx)
+ movl %edx, 4(%ecx)
+ movl %esi, 8(%ecx)
+ movl %edi, 16(%ecx)
+ movl oEDX(%eax), %ebx
+ movl oECX(%eax), %edx
+ movl oEAX(%eax), %esi
+ movl oEIP(%eax), %edi
+ movl %ebx, 20(%ecx)
+ movl %edx, 24(%ecx)
+ movl %esi, 28(%ecx)
+ movl %edi, 32(%ecx)
+
+ /* Set the new stack address. The stack points now to the block
+ we put the register content in. */
+ movl %ecx, %esp
+ /* Restore the register content. */
+ popa
+ /* The following 'ret' will pop the addres of the code and jump
+ to it. */
+
+L(pseudo_end):
+ ret
+PSEUDO_END(__setcontext)
+
+weak_alias(__setcontext, setcontext)
--- /dev/null
+/* Save current context and install the given one.
+ Copyright (C) 2001 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+
+ENTRY(__swapcontext)
+ /* Load address of the context data structure we save in. */
+ movl 4(%esp), %eax
+
+ /* Return value of swapcontext. EAX is the only register whose
+ value is not preserved. */
+ movl $0, oEAX(%eax)
+
+ /* Save the 32-bit register values and the return address. */
+ movl %ecx, oECX(%eax)
+ movl %edx, oEDX(%eax)
+ movl %edi, oEDI(%eax)
+ movl %esi, oESI(%eax)
+ movl %ebp, oEBP(%eax)
+ movl (%esp), %ecx
+ movl %ecx, oEIP(%eax)
+ leal 4(%esp), %ecx
+ movl %ecx, oESP(%eax)
+ movl %ebx, oEBX(%eax)
+
+ /* Save the FS and GS segment register. */
+ xorl %edx, %edx
+ xorl %ecx, %ecx
+ movw %gs, %dx
+ movw %fs, %cx
+ movl %edx, oGS(%eax)
+ movl %ecx, oFS(%eax)
+
+ /* We have separate floating-point register content memory on the
+ stack. We use the __fpregs_mem block in the context. Set the
+ links up correctly. */
+ leal oFPREGSMEM(%eax), %ecx
+ movl %ecx, oFPREGS(%eax)
+ /* Save the floating-point context. */
+ fnstenv (%ecx)
+
+ /* Load address of the context data structure we have to load. */
+ movl 8(%esp), %ecx
+
+ /* Save the current signal mask and install the new one. */
+ pushl %ebx
+ leal oSIGMASK(%eax), %edx
+ leal oSIGMASK(%ecx), %ecx
+ movl $SIG_SETMASK, %ebx
+ movl $__NR_sigprocmask, %eax
+ int $0x80
+ popl %ebx
+ cmpl $-4095, %eax /* Check %eax for error. */
+ jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
+
+ /* EAX was modified, reload it. */
+ movl 8(%esp), %eax
+
+ /* Restore the floating-point context. Not the registers, only the
+ rest. */
+ movl oFPREGS(%eax), %ecx
+ fldenv (%ecx)
+
+ /* Restore the FS and GS segment registers. */
+ movl oGS(%eax), %edx
+ movl oFS(%eax), %ecx
+ movw %dx, %gs
+ movw %cx, %fs
+
+ /* Load the new stack pointer. */
+ movl oESP(%eax), %ecx
+ /* Make room for 8 registers and the return address. We will load
+ the values from the stack. */
+ subl $36, %ecx
+
+ /* Move the values of all the 32-bit registers (except ESP) on
+ the stack. This happens in the form the 'popa' instruction
+ expects it. Before this block put the address of the code
+ to execute. */
+ movl oEDI(%eax), %ebx
+ movl oESI(%eax), %edx
+ movl oEBP(%eax), %esi
+ movl oEBX(%eax), %edi
+ movl %ebx, (%ecx)
+ movl %edx, 4(%ecx)
+ movl %esi, 8(%ecx)
+ movl %edi, 16(%ecx)
+ movl oEDX(%eax), %ebx
+ movl oECX(%eax), %edx
+ movl oEAX(%eax), %esi
+ movl oEIP(%eax), %edi
+ movl %ebx, 20(%ecx)
+ movl %edx, 24(%ecx)
+ movl %esi, 28(%ecx)
+ movl %edi, 32(%ecx)
+
+ /* Set the new stack address. The stack points now to the block
+ we put the register content in. */
+ movl %ecx, %esp
+ /* Restore the register content. */
+ popa
+ /* The following 'ret' will pop the addres of the code and jump
+ to it. */
+
+L(pseudo_end):
+ ret
+PSEUDO_END(__swapcontext)
+
+weak_alias(__swapcontext, swapcontext)
--- /dev/null
+/* Offsets and other constants needed in the *context() function
+ implementation.
+ Copyright (C) 2001 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#define SIG_BLOCK 0
+#define SIG_SETMASK 2
+
+/* Offsets of the fields in the ucontext_t structure. */
+#define oLINK 4
+#define oSS_SP 8
+#define oSS_SIZE 16
+#define oGS 20
+#define oFS 24
+#define oEDI 36
+#define oESI 40
+#define oEBP 44
+#define oESP 48
+#define oEBX 52
+#define oEDX 56
+#define oECX 60
+#define oEAX 64
+#define oEIP 76
+#define oFPREGS 96
+#define oSIGMASK 108
+#define oFPREGSMEM 236
projects / platform / upstream / glibc.git / commitdiff