diff options
Diffstat (limited to 'lib/libproc/proc_regs.c')
| -rw-r--r-- | lib/libproc/proc_regs.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/lib/libproc/proc_regs.c b/lib/libproc/proc_regs.c new file mode 100644 index 0000000..3450e98 --- /dev/null +++ b/lib/libproc/proc_regs.c @@ -0,0 +1,113 @@ +/* + * Copyright (c) 2010 The FreeBSD Foundation + * All rights reserved. + * + * This software was developed by Rui Paulo under sponsorship from the + * FreeBSD Foundation. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> +#include <sys/ptrace.h> + +#include <err.h> +#include <stdio.h> +#include <string.h> +#include <errno.h> +#include "_libproc.h" + +int +proc_regget(struct proc_handle *phdl, proc_reg_t reg, unsigned long *regvalue) +{ + struct reg regs; + + if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD || + phdl->status == PS_IDLE) { + errno = ENOENT; + return (-1); + } + memset(®s, 0, sizeof(regs)); + if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) + return (-1); + switch (reg) { + case REG_PC: +#if defined(__amd64__) + *regvalue = regs.r_rip; +#elif defined(__i386__) + *regvalue = regs.r_eip; +#endif + break; + case REG_SP: +#if defined(__amd64__) + *regvalue = regs.r_rsp; +#elif defined(__i386__) + *regvalue = regs.r_esp; +#endif + break; + default: + warn("ERROR: no support for reg number %d", reg); + return (-1); + } + + return (0); +} + +int +proc_regset(struct proc_handle *phdl, proc_reg_t reg, unsigned long regvalue) +{ + struct reg regs; + + if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD || + phdl->status == PS_IDLE) { + errno = ENOENT; + return (-1); + } + if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) + return (-1); + switch (reg) { + case REG_PC: +#if defined(__amd64__) + regs.r_rip = regvalue; +#elif defined(__i386__) + regs.r_eip = regvalue; +#endif + break; + case REG_SP: +#if defined(__amd64__) + regs.r_rsp = regvalue; +#elif defined(__i386__) + regs.r_esp = regvalue; +#endif + break; + default: + warn("ERROR: no support for reg number %d", reg); + return (-1); + } + if (ptrace(PT_SETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) + return (-1); + + return (0); +} |
