147 lines
3.8 KiB
C
147 lines
3.8 KiB
C
/*
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* This file is part of ltrace.
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* Copyright (C) 2008,2009 Juan Cespedes
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* Copyright (C) 2006 Steve Fink
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* Copyright (C) 2006 Ian Wienand
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stddef.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <sys/ptrace.h>
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#include <string.h>
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#include <asm/ptrace_offsets.h>
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#include <asm/rse.h>
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#include <errno.h>
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#include "proc.h"
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#include "common.h"
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#include "type.h"
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/* What we think of as a bundle, ptrace thinks of it as two unsigned
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* longs */
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union bundle_t {
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/* An IA64 instruction bundle has a 5 bit header describing the
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* type of bundle, then 3 41 bit instructions
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*/
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struct {
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struct {
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unsigned long template:5;
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unsigned long slot0:41;
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unsigned long bot_slot1:18;
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} word0;
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struct {
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unsigned long top_slot1:23;
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unsigned long slot2:41;
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} word1;
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} bitmap;
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unsigned long code[2];
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};
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union cfm_t {
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struct {
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unsigned long sof:7;
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unsigned long sol:7;
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unsigned long sor:4;
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unsigned long rrb_gr:7;
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unsigned long rrb_fr:7;
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unsigned long rrb_pr:6;
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} cfm;
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unsigned long value;
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};
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int
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syscall_p(struct process *proc, int status, int *sysnum)
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{
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if (WIFSTOPPED(status)
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&& WSTOPSIG(status) == (SIGTRAP | proc->tracesysgood)) {
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long l = ptrace(PTRACE_PEEKUSER, proc->pid, PT_CR_IPSR, 0);
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if (l == -1 && errno)
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return -1;
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unsigned long slot = ((unsigned long)l >> 41) & 0x3;
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unsigned long ip =
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ptrace(PTRACE_PEEKUSER, proc->pid, PT_CR_IIP, 0);
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/* r15 holds the system call number */
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unsigned long r15 =
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ptrace(PTRACE_PEEKUSER, proc->pid, PT_R15, 0);
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unsigned long insn;
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union bundle_t bundle;
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/* On fault, the IP has moved forward to the next
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* slot. If that is zero, then the actual place we
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* broke was in the previous bundle, so wind back the
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* IP.
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*/
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if (slot == 0)
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ip = ip - 16;
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bundle.code[0] = ptrace(PTRACE_PEEKTEXT, proc->pid, ip, 0);
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bundle.code[1] = ptrace(PTRACE_PEEKTEXT, proc->pid, ip + 8, 0);
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unsigned long bot = 0UL | bundle.bitmap.word0.bot_slot1;
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unsigned long top = 0UL | bundle.bitmap.word1.top_slot1;
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/* handle the rollback, slot 0 is actually slot 2 of
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* the previous instruction (see above) */
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switch (slot) {
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case 0:
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insn = bundle.bitmap.word1.slot2;
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break;
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case 1:
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insn = bundle.bitmap.word0.slot0;
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break;
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case 2:
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/* make sure we're shifting about longs */
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insn = 0UL | bot | (top << 18UL);
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break;
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default:
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printf("Ummm, can't find instruction slot?\n");
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exit(1);
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}
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/* We need to support both the older break instruction
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* type syscalls, and the new epc type ones.
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*
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* Bit 20 of the break constant is encoded in the "i"
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* bit (bit 36) of the instruction, hence you should
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* see 0x1000000000.
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*
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* An EPC call is just 0x1ffffffffff
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*/
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if (insn == 0x1000000000 || insn == 0x1ffffffffff) {
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*sysnum = r15;
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if (proc->callstack_depth > 0 &&
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proc->callstack[proc->callstack_depth - 1].is_syscall &&
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proc->callstack[proc->callstack_depth - 1].c_un.syscall == *sysnum) {
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return 2;
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}
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return 1;
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}
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}
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return 0;
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}
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void
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get_arch_dep(struct process *proc)
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{
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}
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