a5f14abfd2
A new sysdecode_syscallname() function accepts a system call code and returns a string of the corresponding name (or NULL if the code is unknown). To support different process ABIs, the new function accepts a value from a new sysdecode_abi enum as its first argument to select the ABI in use. Current ABIs supported include FREEBSD (native binaries), FREEBSD32, LINUX, LINUX32, and CLOUDABI64. Note that not all ABIs are supported by all platforms. In general, a given ABI is only supported if a platform can execute binaries for that ABI. To simplify the implementation, libsysdecode's build reuses the existing pre-generated files from the kernel source tree rather than duplicating new copies of said files during the build. kdump(1) and truss(1) now use these functions to map system call identifiers to names. For kdump(1), a new 'syscallname()' function consolidates duplicated code from ktrsyscall() and ktrsyscallret(). The Linux ABI no longer requires custom handling for ktrsyscall() and linux_ktrsyscall() has been removed as a result. Reviewed by: bdrewery Differential Revision: https://reviews.freebsd.org/D4823
140 lines
4.0 KiB
C
140 lines
4.0 KiB
C
/*
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* Copyright 1998 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/mips-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 <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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mips_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 the first argument.
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*/
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reg = A0;
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switch (regs.r_regs[V0]) {
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case SYS_syscall:
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reg = A1;
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break;
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case SYS___syscall:
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#if defined(__mips_n32) || defined(__mips_n64)
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reg = A1;
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#else
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reg = A2;
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#endif
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break;
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}
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#if defined(__mips_n32) || defined(__mips_n64)
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#define MAXREG A7
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#else
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#define MAXREG A3
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#endif
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for (i = 0; i < narg && reg <= MAXREG; i++, reg++)
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cs->args[i] = regs.r_regs[reg];
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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 *)((uintptr_t)regs.r_regs[SP] +
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4 * sizeof(cs->args[0]));
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iorequest.piod_addr = &cs->args[i];
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iorequest.piod_len = (narg - i) * sizeof(cs->args[0]);
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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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mips_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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/* XXX: Does not have special handling for __syscall(). */
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retval[0] = regs.r_regs[V0];
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retval[1] = regs.r_regs[V1];
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*errorp = !!regs.r_regs[A3];
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return (0);
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}
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static struct procabi mips_freebsd = {
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#ifdef __mips_n64
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"FreeBSD ELF64",
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#else
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"FreeBSD ELF32",
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#endif
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FREEBSD,
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mips_fetch_args,
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mips_fetch_retval
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};
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PROCABI(mips_freebsd);
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