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87 lines
2.9 KiB
87 lines
2.9 KiB
/* |
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* Copyright (c) 2003 Russell King <rmk@arm.linux.org.uk> |
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* Copyright (c) 2011-2013 Denys Vlasenko <vda.linux@googlemail.com> |
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* Copyright (c) 2011-2015 Dmitry V. Levin <ldv@altlinux.org> |
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* Copyright (c) 2015-2017 The strace developers. |
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* All rights reserved. |
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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. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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/* Return codes: 1 - ok, 0 - ignore, other - error. */ |
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static int |
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arch_get_scno(struct tcb *tcp) |
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{ |
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kernel_ulong_t scno = 0; |
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/* Note: we support only 32-bit CPUs, not 26-bit */ |
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#if !defined(__ARM_EABI__) || ENABLE_ARM_OABI |
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if (arm_regs.ARM_cpsr & 0x20) { |
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/* Thumb mode */ |
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goto scno_in_r7; |
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} |
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/* ARM mode */ |
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/* Check EABI/OABI by examining SVC insn's low 24 bits */ |
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errno = 0; |
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scno = ptrace(PTRACE_PEEKTEXT, tcp->pid, (void *)(arm_regs.ARM_pc - 4), NULL); |
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if (errno) |
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return -1; |
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/* EABI syscall convention? */ |
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if (scno != 0xef000000) { |
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/* No, it's OABI */ |
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if ((scno & 0x0ff00000) != 0x0f900000) { |
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error_msg("pid %d unknown syscall trap 0x%08lx", |
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tcp->pid, scno); |
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return -1; |
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} |
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/* Fixup the syscall number */ |
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scno &= 0x000fffff; |
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} else { |
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scno_in_r7: |
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scno = arm_regs.ARM_r7; |
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} |
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#else /* __ARM_EABI__ || !ENABLE_ARM_OABI */ |
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scno = arm_regs.ARM_r7; |
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#endif |
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scno = shuffle_scno(scno); |
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/* |
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* Do some sanity checks to figure out |
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* whether it's really a syscall entry. |
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*/ |
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if (arm_regs.ARM_ip && !scno_in_range(scno)) { |
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if (debug_flag) |
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error_msg("pid %d stray syscall exit:" |
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" ARM_ip = %ld, scno = %ld", |
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tcp->pid, arm_regs.ARM_ip, |
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shuffle_scno(scno)); |
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return 0; |
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} |
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tcp->scno = scno; |
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return 1; |
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}
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