5842bd683f
Suggested by: jmallett Reviewed by: bdrewery, jmallett Differential Revision: https://reviews.freebsd.org/D5123
130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/*
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* Copyright 1997 Sean Eric Fagan
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Sean Eric Fagan
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* 4. Neither the name of the author may be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/* FreeBSD/amd64-specific system call handling. */
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#include <sys/ptrace.h>
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#include <sys/syscall.h>
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#include <machine/reg.h>
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#include <machine/psl.h>
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#include <stdio.h>
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#include <sysdecode.h>
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#include "truss.h"
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static int
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amd64_fetch_args(struct trussinfo *trussinfo, u_int narg)
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{
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struct ptrace_io_desc iorequest;
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struct reg regs;
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struct current_syscall *cs;
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lwpid_t tid;
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u_int i, reg;
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tid = trussinfo->curthread->tid;
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cs = &trussinfo->curthread->cs;
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if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
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fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
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return (-1);
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}
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/*
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* FreeBSD has two special kinds of system call redirections --
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* SYS_syscall, and SYS___syscall. The former is the old syscall()
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* routine, basically; the latter is for quad-aligned arguments.
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*
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* The system call argument count and code from ptrace() already
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* account for these, but we need to skip over %rax if it contains
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* either of these values.
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*/
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reg = 0;
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switch (regs.r_rax) {
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case SYS_syscall:
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case SYS___syscall:
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reg++;
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break;
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}
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for (i = 0; i < narg && reg < 6; i++, reg++) {
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switch (reg) {
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case 0: cs->args[i] = regs.r_rdi; break;
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case 1: cs->args[i] = regs.r_rsi; break;
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case 2: cs->args[i] = regs.r_rdx; break;
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case 3: cs->args[i] = regs.r_rcx; break;
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case 4: cs->args[i] = regs.r_r8; break;
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case 5: cs->args[i] = regs.r_r9; break;
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}
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}
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if (narg > i) {
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iorequest.piod_op = PIOD_READ_D;
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iorequest.piod_offs = (void *)(regs.r_rsp + sizeof(register_t));
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iorequest.piod_addr = &cs->args[i];
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iorequest.piod_len = (narg - i) * sizeof(register_t);
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ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
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if (iorequest.piod_len == 0)
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return (-1);
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}
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return (0);
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}
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static int
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amd64_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp)
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{
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struct reg regs;
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lwpid_t tid;
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tid = trussinfo->curthread->tid;
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if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
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fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
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return (-1);
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}
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retval[0] = regs.r_rax;
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retval[1] = regs.r_rdx;
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*errorp = !!(regs.r_rflags & PSL_C);
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return (0);
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}
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static struct procabi amd64_freebsd = {
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"FreeBSD ELF64",
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SYSDECODE_ABI_FREEBSD,
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amd64_fetch_args,
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amd64_fetch_retval
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};
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PROCABI(amd64_freebsd);
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