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a5f6096c80
Handle floating point state in across signals correctly. UML/i386 needs to know whether the host does PTRACE_[GS]ETFPXREGS, so an arch_init_registers hook is added, which on x86_64 does nothing. UML doesn't save and restore floating point registers on kernel entry and exit, so they need to be copied between the host process and the sigcontext. save_fpx_registers and restore_fpx_registers are added for this purpose. save_fp_registers and restore_fp_registers already exist. There was a bunch of floating point state conversion code in arch/um/sys-i386/ptrace.c which isn't needed there, but is needed in signal.c, so it is moved over. The i386 code now distinguishes between fp and fpx state and handles them correctly. The x86_64 code just needs to copy state as-is between the host process and the stack. There are also some fixes there to pass the correct address of the floating point state around. 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>
23 lines
781 B
C
23 lines
781 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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#ifndef __REGISTERS_H
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#define __REGISTERS_H
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#include "sysdep/ptrace.h"
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#include "sysdep/archsetjmp.h"
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extern void init_thread_registers(struct uml_pt_regs *to);
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extern int save_fp_registers(int pid, unsigned long *fp_regs);
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extern int restore_fp_registers(int pid, unsigned long *fp_regs);
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extern int save_fpx_registers(int pid, unsigned long *fp_regs);
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extern int restore_fpx_registers(int pid, unsigned long *fp_regs);
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extern void save_registers(int pid, struct uml_pt_regs *regs);
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extern void restore_registers(int pid, struct uml_pt_regs *regs);
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extern void init_registers(int pid);
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extern void get_safe_registers(unsigned long *regs);
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extern unsigned long get_thread_reg(int reg, jmp_buf *buf);
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#endif
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