e2216feb37
We weren't making sure that we initialized the FP registers of new processes to sane values. This patch also moves some defines in the affected area closer to where they are used. Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
141 lines
3.2 KiB
C
141 lines
3.2 KiB
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 <string.h>
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#include <setjmp.h>
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#include "sysdep/ptrace_user.h"
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#include "sysdep/ptrace.h"
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#include "uml-config.h"
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#include "skas_ptregs.h"
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#include "registers.h"
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#include "user.h"
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/* These are set once at boot time and not changed thereafter */
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static unsigned long exec_regs[HOST_FRAME_SIZE];
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static unsigned long exec_fp_regs[HOST_FP_SIZE];
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static unsigned long exec_fpx_regs[HOST_XFP_SIZE];
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static int have_fpx_regs = 1;
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void init_thread_registers(union uml_pt_regs *to)
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{
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memcpy(to->skas.regs, exec_regs, sizeof(to->skas.regs));
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memcpy(to->skas.fp, exec_fp_regs, sizeof(to->skas.fp));
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if(have_fpx_regs)
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memcpy(to->skas.xfp, exec_fpx_regs, sizeof(to->skas.xfp));
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}
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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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static int move_registers(int pid, int int_op, union uml_pt_regs *regs,
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int fp_op, unsigned long *fp_regs)
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{
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if(ptrace(int_op, pid, 0, regs->skas.regs) < 0)
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return(-errno);
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if(ptrace(fp_op, 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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void save_registers(int pid, union uml_pt_regs *regs)
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{
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unsigned long *fp_regs;
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int err, fp_op;
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if(have_fpx_regs){
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fp_op = PTRACE_GETFPXREGS;
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fp_regs = regs->skas.xfp;
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}
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else {
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fp_op = PTRACE_GETFPREGS;
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fp_regs = regs->skas.fp;
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}
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err = move_registers(pid, PTRACE_GETREGS, regs, fp_op, fp_regs);
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if(err)
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panic("save_registers - saving registers failed, errno = %d\n",
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-err);
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}
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void restore_registers(int pid, union uml_pt_regs *regs)
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{
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unsigned long *fp_regs;
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int err, fp_op;
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if(have_fpx_regs){
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fp_op = PTRACE_SETFPXREGS;
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fp_regs = regs->skas.xfp;
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}
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else {
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fp_op = PTRACE_SETFPREGS;
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fp_regs = regs->skas.fp;
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}
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err = move_registers(pid, PTRACE_SETREGS, regs, fp_op, fp_regs);
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if(err)
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panic("restore_registers - saving registers failed, "
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"errno = %d\n", -err);
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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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err);
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errno = 0;
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err = ptrace(PTRACE_GETFPXREGS, pid, 0, exec_fpx_regs);
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if(!err)
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return;
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if(errno != EIO)
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panic("check_ptrace : PTRACE_GETFPXREGS failed, errno = %d",
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errno);
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have_fpx_regs = 0;
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err = ptrace(PTRACE_GETFPREGS, pid, 0, exec_fp_regs);
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if(err)
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panic("check_ptrace : PTRACE_GETFPREGS failed, errno = %d",
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err);
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}
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void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
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{
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memcpy(regs, exec_regs, HOST_FRAME_SIZE * sizeof(unsigned long));
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if(fp_regs != NULL)
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memcpy(fp_regs, exec_fp_regs,
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HOST_FP_SIZE * sizeof(unsigned long));
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}
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void get_thread_regs(union uml_pt_regs *uml_regs, void *buffer)
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{
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struct __jmp_buf_tag *jmpbuf = buffer;
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UPT_SET(uml_regs, EIP, jmpbuf->__jmpbuf[JB_PC]);
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UPT_SET(uml_regs, UESP, jmpbuf->__jmpbuf[JB_SP]);
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UPT_SET(uml_regs, EBP, jmpbuf->__jmpbuf[JB_BP]);
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}
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