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>
57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
/*
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* Copyright (C) 2004 PathScale, Inc
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* Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include <errno.h>
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#include <string.h>
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#include <sys/ptrace.h>
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#include "sysdep/ptrace.h"
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#include "user.h"
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/* This is set once at boot time and not changed thereafter */
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static unsigned long exec_regs[MAX_REG_NR];
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void init_thread_registers(struct uml_pt_regs *to)
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{
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memcpy(to->gp, exec_regs, sizeof(to->gp));
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}
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void save_registers(int pid, struct uml_pt_regs *regs)
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{
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int err;
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err = ptrace(PTRACE_GETREGS, pid, 0, regs->gp);
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if (err < 0)
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panic("save_registers - saving registers failed, errno = %d\n",
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errno);
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}
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void restore_registers(int pid, struct uml_pt_regs *regs)
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{
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int err;
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err = ptrace(PTRACE_SETREGS, pid, 0, regs->gp);
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if (err < 0)
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panic("restore_registers - saving registers failed, "
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"errno = %d\n", errno);
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}
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void init_registers(int pid)
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{
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int err;
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err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
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if (err)
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panic("check_ptrace : PTRACE_GETREGS failed, errno = %d",
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errno);
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arch_init_registers(pid);
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}
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void get_safe_registers(unsigned long *regs)
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{
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memcpy(regs, exec_regs, sizeof(exec_regs));
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}
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