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/*-
* Copyright 2017 Li-Wen Hsu <lwhsu@FreeBSD.org>
*
* 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("$FreeBSD$");
/* FreeBSD/riscv-specific system call handling. */
#include <sys/ptrace.h>
#include <sys/syscall.h>
#include <machine/frame.h>
#include <machine/reg.h>
#include <stdbool.h>
#include <stdio.h>
#include <sysdecode.h>
#include "truss.h"
static int
riscv_fetch_args(struct trussinfo *trussinfo, u_int narg)
{
struct reg regs;
struct current_syscall *cs;
lwpid_t tid;
u_int i, reg, syscall_num;
tid = trussinfo->curthread->tid;
cs = &trussinfo->curthread->cs;
if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
return (-1);
}
/*
* FreeBSD has two special kinds of system call redirections --
* SYS_syscall, and SYS___syscall. The former is the old syscall()
* routine, basically; the latter is for quad-aligned arguments.
*
* The system call argument count and code from ptrace() already
* account for these, but we need to skip over the first argument.
*/
syscall_num = regs.t[0];
if (syscall_num == SYS_syscall || syscall_num == SYS___syscall) {
reg = 1;
syscall_num = regs.a[0];
} else {
reg = 0;
}
for (i = 0; i < narg && reg < NARGREG; i++, reg++)
cs->args[i] = regs.a[reg];
return (0);
}
static int
riscv_fetch_retval(struct trussinfo *trussinfo, long *retval, int *errorp)
{
struct reg regs;
lwpid_t tid;
tid = trussinfo->curthread->tid;
if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
return (-1);
}
retval[0] = regs.a[0];
retval[1] = regs.a[1];
*errorp = !!(regs.t[0]);
return (0);
}
static struct procabi riscv_freebsd = {
"FreeBSD ELF64",
SYSDECODE_ABI_FREEBSD,
riscv_fetch_args,
riscv_fetch_retval,
STAILQ_HEAD_INITIALIZER(riscv_freebsd.extra_syscalls),
{ NULL }
};
PROCABI(riscv_freebsd);
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