247 lines
6 KiB
C
247 lines
6 KiB
C
/*
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* This file is part of ltrace.
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* Copyright (C) 2010,2012,2013 Petr Machata, Red Hat Inc.
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* Copyright (C) 2011 Andreas Schwab
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* Copyright (C) 2002,2004,2008,2009 Juan Cespedes
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* Copyright (C) 2008 Luis Machado, IBM Corporation
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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 <assert.h>
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#include <elf.h>
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#include <errno.h>
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#include <signal.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include "backend.h"
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#include "breakpoint.h"
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#include "common.h"
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#include "insn.h"
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#include "proc.h"
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#include "ptrace.h"
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#include "type.h"
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#if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
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# define PTRACE_PEEKUSER PTRACE_PEEKUSR
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#endif
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#if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR))
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# define PTRACE_POKEUSER PTRACE_POKEUSR
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#endif
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void
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get_arch_dep(struct process *proc)
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{
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#ifdef __powerpc64__
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proc->mask_32bit = (proc->e_machine == EM_PPC);
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#endif
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}
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#define SYSCALL_INSN 0x44000002
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/* Returns 1 if syscall, 2 if sysret, 0 otherwise. */
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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 pc = (long)get_instruction_pointer(proc);
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int insn =
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(int)ptrace(PTRACE_PEEKTEXT, proc->pid, pc - sizeof(long),
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0);
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if (insn == SYSCALL_INSN) {
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*sysnum =
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(int)ptrace(PTRACE_PEEKUSER, proc->pid,
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sizeof(long) * PT_R0, 0);
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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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/* The atomic skip code is mostly taken from GDB. */
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enum sw_singlestep_status
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arch_sw_singlestep(struct process *proc, struct breakpoint *sbp,
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int (*add_cb)(arch_addr_t, struct sw_singlestep_data *),
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struct sw_singlestep_data *add_cb_data)
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{
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arch_addr_t ip = get_instruction_pointer(proc);
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struct breakpoint *other = address2bpstruct(proc->leader, ip);
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debug(1, "arch_sw_singlestep pid=%d addr=%p %s(%p)",
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proc->pid, ip, breakpoint_name(sbp), sbp->addr);
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/* If the original instruction was lwarx/ldarx, we can't
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* single-step over it, instead we have to execute the whole
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* atomic block at once. */
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union {
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uint32_t insn;
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char buf[BREAKPOINT_LENGTH];
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} u;
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if (other != NULL) {
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memcpy(u.buf, sbp->orig_value, BREAKPOINT_LENGTH);
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} else if (proc_read_32(proc, ip, &u.insn) < 0) {
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fprintf(stderr, "couldn't read instruction at IP %p\n", ip);
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/* Do the normal singlestep. */
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return SWS_HW;
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}
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if ((u.insn & LWARX_MASK) != LWARX_INSTRUCTION
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&& (u.insn & LWARX_MASK) != LDARX_INSTRUCTION)
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return SWS_HW;
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debug(1, "singlestep over atomic block at %p", ip);
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int insn_count;
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arch_addr_t addr = ip;
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for (insn_count = 0; ; ++insn_count) {
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addr += 4;
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unsigned long l = ptrace(PTRACE_PEEKTEXT, proc->pid, addr, 0);
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if (l == (unsigned long)-1 && errno)
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return SWS_FAIL;
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uint32_t insn;
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#ifdef __powerpc64__
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insn = l >> 32;
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#else
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insn = l;
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#endif
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/* If a conditional branch is found, put a breakpoint
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* in its destination address. */
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if ((insn & BRANCH_MASK) == BC_INSN) {
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arch_addr_t branch_addr = ppc_branch_dest(addr, insn);
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debug(1, "pid=%d, branch in atomic block from %p to %p",
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proc->pid, addr, branch_addr);
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if (add_cb(branch_addr, add_cb_data) < 0)
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return SWS_FAIL;
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}
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/* Assume that the atomic sequence ends with a
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* stwcx/stdcx instruction. */
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if ((insn & STWCX_MASK) == STWCX_INSTRUCTION
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|| (insn & STWCX_MASK) == STDCX_INSTRUCTION) {
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debug(1, "pid=%d, found end of atomic block %p at %p",
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proc->pid, ip, addr);
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break;
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}
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/* Arbitrary cut-off. If we didn't find the
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* terminating instruction by now, just give up. */
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if (insn_count > 16) {
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fprintf(stderr, "[%d] couldn't find end of atomic block"
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" at %p\n", proc->pid, ip);
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return SWS_FAIL;
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}
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}
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/* Put the breakpoint to the next instruction. */
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addr += 4;
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if (add_cb(addr, add_cb_data) < 0)
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return SWS_FAIL;
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debug(1, "PTRACE_CONT");
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ptrace(PTRACE_CONT, proc->pid, 0, 0);
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return SWS_OK;
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}
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size_t
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arch_type_sizeof(struct process *proc, struct arg_type_info *info)
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{
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if (proc == NULL)
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return (size_t)-2;
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switch (info->type) {
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case ARGTYPE_VOID:
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return 0;
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case ARGTYPE_CHAR:
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return 1;
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case ARGTYPE_SHORT:
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case ARGTYPE_USHORT:
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return 2;
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case ARGTYPE_INT:
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case ARGTYPE_UINT:
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return 4;
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case ARGTYPE_LONG:
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case ARGTYPE_ULONG:
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case ARGTYPE_POINTER:
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return proc->e_machine == EM_PPC64 ? 8 : 4;
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case ARGTYPE_FLOAT:
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return 4;
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case ARGTYPE_DOUBLE:
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return 8;
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case ARGTYPE_ARRAY:
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case ARGTYPE_STRUCT:
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/* Use default value. */
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return (size_t)-2;
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default:
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assert(info->type != info->type);
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abort();
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break;
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}
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}
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size_t
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arch_type_alignof(struct process *proc, struct arg_type_info *info)
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{
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if (proc == NULL)
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return (size_t)-2;
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switch (info->type) {
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default:
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assert(info->type != info->type);
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abort();
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break;
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case ARGTYPE_CHAR:
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case ARGTYPE_SHORT:
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case ARGTYPE_USHORT:
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case ARGTYPE_INT:
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case ARGTYPE_UINT:
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case ARGTYPE_LONG:
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case ARGTYPE_ULONG:
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case ARGTYPE_POINTER:
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case ARGTYPE_FLOAT:
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case ARGTYPE_DOUBLE:
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/* On both PPC and PPC64, fundamental types have the
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* same alignment as size. */
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return arch_type_sizeof(proc, info);
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case ARGTYPE_ARRAY:
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case ARGTYPE_STRUCT:
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/* Use default value. */
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return (size_t)-2;
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}
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}
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