107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
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/*-
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* Copyright 2017 Li-Wen Hsu <lwhsu@FreeBSD.org>
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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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*
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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/riscv64-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/frame.h>
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#include <machine/reg.h>
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#include <stdbool.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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riscv64_fetch_args(struct trussinfo *trussinfo, u_int narg)
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{
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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, syscall_num;
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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 the first argument.
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*/
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syscall_num = regs.t[0];
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if (syscall_num == SYS_syscall || syscall_num == SYS___syscall) {
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reg = 1;
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syscall_num = regs.a[0];
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} else {
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reg = 0;
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}
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for (i = 0; i < narg && reg < NARGREG; i++, reg++)
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cs->args[i] = regs.a[reg];
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return (0);
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}
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static int
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riscv64_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.a[0];
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retval[1] = regs.a[1];
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*errorp = !!(regs.t[0]);
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return (0);
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}
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static struct procabi riscv64_freebsd = {
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"FreeBSD ELF64",
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SYSDECODE_ABI_FREEBSD,
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riscv64_fetch_args,
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riscv64_fetch_retval,
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STAILQ_HEAD_INITIALIZER(riscv64_freebsd.extra_syscalls),
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{ NULL }
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};
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PROCABI(riscv64_freebsd);
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