42daba3165
Throw out a lot of code dealing with saving and restoring floating-point
state. In skas mode, where processes run in a restoring floating-point state
on kernel entry and exit is pointless.
This eliminates most of arch/um/os-Linux/sys-{i386,x86_64}/registers.c. Most
of what remained is now arch-indpendent, and can be moved up to
arch/um/os-Linux/registers.c. Both arches need the jmp_buf accessor
get_thread_reg, and i386 needs {save,restore}_fp_regs because it cheats during
sigreturn by getting the fp state using ptrace rather than copying it out of
the process sigcontext.
After this, it turns out that arch/um/include/skas/mode-skas.h is almost
completely unneeded. The declarations in it are variables which either don't
exist or which don't have global scope. The one exception is
kill_off_processes_skas. If that's removed, this header can be deleted.
This uncovered a bug in user.h, which wasn't correctly making sure that a
size_t definition was available to both userspace and kernelspace files.
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
38 lines
819 B
C
38 lines
819 B
C
/*
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* Copyright (C) 2004 PathScale, Inc
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* Licensed under the GPL
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*/
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#include <errno.h>
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#include <sysdep/ptrace_user.h>
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#include "longjmp.h"
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#include "user.h"
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/* XXX These need to use [GS]ETFPXREGS and copy_sc_{to,from}_user_skas needs
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* to pass in a sufficiently large buffer
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*/
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int save_fp_registers(int pid, unsigned long *fp_regs)
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{
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if(ptrace(PTRACE_GETFPREGS, pid, 0, fp_regs) < 0)
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return -errno;
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return 0;
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}
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int restore_fp_registers(int pid, unsigned long *fp_regs)
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{
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if(ptrace(PTRACE_SETFPREGS, pid, 0, fp_regs) < 0)
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return -errno;
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return 0;
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}
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unsigned long get_thread_reg(int reg, jmp_buf *buf)
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{
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switch(reg){
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case EIP: return buf[0]->__eip;
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case UESP: return buf[0]->__esp;
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case EBP: return buf[0]->__ebp;
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default:
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printk("get_thread_regs - unknown register %d\n", reg);
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return 0;
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}
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}
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