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dpavlin |
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/* |
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* Copyright (C) 2004-2007 Anders Gavare. 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 are met: |
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* |
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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 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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* |
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dpavlin |
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* $Id: useremul_freebsd.c,v 1.6 2007/06/17 23:32:20 debug Exp $ |
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dpavlin |
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* |
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dpavlin |
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* COMMENT: FreeBSD userland (syscall) emulation implementation |
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dpavlin |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include "cpu.h" |
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#include "machine.h" |
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#include "useremul.h" |
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#include "errno_freebsd.h" |
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#include "syscall_freebsd.h" |
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/* |
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* useremul_freebsd_setup(): |
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* |
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* Set up an emulated userland environment suitable for running FreeBSD |
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* binaries. |
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*/ |
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void useremul_freebsd_setup(struct cpu *cpu, int argc, char **host_argv) |
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{ |
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switch (cpu->machine->arch) { |
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case ARCH_ALPHA: |
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/* According to FreeBSD's /usr/src/lib/csu/alpha/crt1.c: */ |
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/* a0 = char **ap */ |
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/* a1 = void (*cleanup)(void) from shared loader */ |
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/* a2 = struct Struct_Obj_Entry *obj from shared loader */ |
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/* a3 = struct ps_strings *ps_strings */ |
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cpu->cd.alpha.r[ALPHA_A0] = 0; |
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cpu->cd.alpha.r[ALPHA_A1] = 0; |
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cpu->cd.alpha.r[ALPHA_A2] = 0; |
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cpu->cd.alpha.r[ALPHA_A3] = 0; |
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cpu->cd.alpha.r[ALPHA_SP] = 0x11ffc000; |
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break; |
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default: |
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fatal("The selected architecture is not supported yet for" |
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" FreeBSD syscall emulation.\n"); |
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exit(1); |
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} |
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} |
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/* |
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* useremul_freebsd(): |
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* |
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* FreeBSD/Alpha syscall emulation. |
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*/ |
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void useremul_freebsd(struct cpu *cpu, uint32_t code) |
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{ |
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int syscall_nr = -1; |
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int64_t result = 0, error_flag = 0; |
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uint64_t arg0=0, arg1=0, arg2=0, arg3=0, arg4=0, arg5=0; |
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/* |
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* Retrieve syscall arguments (in registers and/or the stack): |
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*/ |
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switch (cpu->machine->arch) { |
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case ARCH_ALPHA: |
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syscall_nr = cpu->cd.alpha.r[ALPHA_V0]; |
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arg0 = cpu->cd.alpha.r[ALPHA_A0]; |
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arg1 = cpu->cd.alpha.r[ALPHA_A1]; |
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arg2 = cpu->cd.alpha.r[ALPHA_A2]; |
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arg3 = cpu->cd.alpha.r[ALPHA_A3]; |
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arg4 = cpu->cd.alpha.r[ALPHA_A4]; |
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arg5 = cpu->cd.alpha.r[ALPHA_A5]; |
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if (syscall_nr == FREEBSD_SYS___syscall) { |
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syscall_nr = arg0; |
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arg0 = arg1; |
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arg1 = arg2; |
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arg2 = arg3; |
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arg3 = arg4; |
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arg4 = arg5; |
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/* TODO: stack arguments */ |
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} |
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break; |
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} |
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/* |
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* Handle the syscall: |
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*/ |
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switch (syscall_nr) { |
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case FREEBSD_SYS_exit: |
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useremul_syscall_exit(cpu, arg0); |
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break; |
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case FREEBSD_SYS_sync: |
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useremul_syscall_sync(cpu); |
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break; |
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default: |
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fatal("[ UNIMPLEMENTED FreeBSD syscall nr %i ]\n", syscall_nr); |
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error_flag = 1; result = FREEBSD_ENOSYS; |
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/* For now, let's abort execution: */ |
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cpu->running = 0; |
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} |
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/* |
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* Return: |
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*/ |
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switch (cpu->machine->arch) { |
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case ARCH_ALPHA: |
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cpu->cd.alpha.r[ALPHA_V0] = result; |
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cpu->cd.alpha.r[ALPHA_A3] = error_flag; |
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break; |
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} |
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} |
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