Mercurial > flash_v2
diff packages/hal/arm/arch/current/src/hal_syscall.c @ 136:a9ac27ec7abc ecos-sw-2000-11-17
Merge from eCos master repository on 2000-11-17-18:24:25-GMT
| author | jlarmour |
|---|---|
| date | Fri, 17 Nov 2000 23:16:43 +0000 |
| parents | |
| children | e0c0827131d1 |
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new file mode 100644 --- /dev/null +++ b/packages/hal/arm/arch/current/src/hal_syscall.c @@ -0,0 +1,119 @@ +//============================================================================= +// +// hal_syscall.c +// +// +// +//============================================================================= +//####COPYRIGHTBEGIN#### +// +// ------------------------------------------- +// The contents of this file are subject to the Red Hat eCos Public License +// Version 1.1 (the "License"); you may not use this file except in +// compliance with the License. You may obtain a copy of the License at +// http://www.redhat.com/ +// +// Software distributed under the License is distributed on an "AS IS" +// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the +// License for the specific language governing rights and limitations under +// the License. +// +// The Original Code is eCos - Embedded Configurable Operating System, +// released September 30, 1998. +// +// The Initial Developer of the Original Code is Red Hat. +// Portions created by Red Hat are +// Copyright (C) 1998, 1999, 2000 Red Hat, Inc. +// All Rights Reserved. +// ------------------------------------------- +// +//####COPYRIGHTEND#### +//============================================================================= +//#####DESCRIPTIONBEGIN#### +// +// Author(s): msalter +// Contributors:msalter +// Date: 2000-11-5 +// Purpose: +// Description: +// +// +// +//####DESCRIPTIONEND#### +// +//============================================================================= + +#include <pkgconf/hal.h> + +#ifdef CYGPKG_REDBOOT +#include <pkgconf/redboot.h> +#endif + +#if defined(CYGSEM_REDBOOT_BSP_SYSCALLS) + +#include <cyg/hal/hal_stub.h> // Our header +#include <cyg/hal/hal_arch.h> // HAL_BREAKINST +#include <cyg/hal/hal_cache.h> // HAL_xCACHE_x +#include <cyg/hal/hal_intr.h> // interrupt disable/restore + +#include <cyg/hal/hal_if.h> // ROM calling interface +#include <cyg/hal/hal_misc.h> // Helper functions + +extern int __do_syscall(int func, // syscall function number + long arg1, long arg2, // up to four args. + long arg3, long arg4, + int *retval); // syscall return value + +#define SYS_exit 1 +#define SYS_interrupt 1000 + +int +hal_syscall_handler(void) +{ + int func, arg1, arg2, arg3, arg4; + int err; + +#if 0 + union arm_insn inst; + + // What is the instruction we were executing + // + inst.word = *(unsigned long *)(regs->_pc - ARM_INST_SIZE); + + // Not a syscall. Don't handle it + if ((inst.swi.rsv1 != SWI_RSV1_VALUE) || (inst.swi.swi_number != SYSCALL_SWI)) + return 0; +#endif + + func = get_register(R0); + arg1 = get_register(R1); + arg2 = get_register(R2); + arg3 = get_register(R3); + arg4 = *(unsigned int *)(get_register(SP) + 4); + + if ((get_register(PS) & CPSR_MODE_BITS) == CPSR_SUPERVISOR_MODE) + put_register(PC, get_register(IP)); + else + put_register(PC, get_register(LR)); + + if (func == SYS_exit) { + // We want to stop in exit so that the user may poke around + // to see why his app exited. + return SIGTRAP; + } + + if (func == SYS_interrupt) { + // A console interrupt landed us here. + // Invoke the debug agent so as to cause a SIGINT. + return SIGINT; + } + + if (__do_syscall(func, arg1, arg2, arg3, arg4, &err)) { + put_register(R0, err); + return 0; + } + + return SIGTRAP; +} + +#endif // CYGSEM_REDBOOT_BSP_SYSCALLS
