7f9cc2359e
In order to be possible to debug usermode threads need to be able issue breakpoint and debug exceptions. To do this it is necessary to set DPL bits to, at least, the same CPL level. Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
/*
|
|
* Copyright (c) 2016 Intel Corporation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#ifndef ZEPHYR_ARCH_X86_INCLUDE_IA32_EXCEPTION_H_
|
|
#define ZEPHYR_ARCH_X86_INCLUDE_IA32_EXCEPTION_H_
|
|
|
|
#ifndef _ASMLANGUAGE
|
|
|
|
#include <toolchain/common.h>
|
|
|
|
#define _EXCEPTION_INTLIST(vector, dpl) \
|
|
".pushsection .gnu.linkonce.intList.exc_" #vector "\n\t" \
|
|
".long 1f\n\t" /* ISR_LIST.fnc */ \
|
|
".long -1\n\t" /* ISR_LIST.irq */ \
|
|
".long -1\n\t" /* ISR_LIST.priority */ \
|
|
".long " STRINGIFY(vector) "\n\t" /* ISR_LIST.vec */ \
|
|
".long " STRINGIFY(dpl) "\n\t" /* ISR_LIST.dpl */ \
|
|
".long 0\n\t" /* ISR_LIST.tss */ \
|
|
".popsection\n\t" \
|
|
|
|
/* Extra preprocessor indirection to ensure arguments get expanded before
|
|
* concatenation takes place
|
|
*/
|
|
#define __EXCEPTION_STUB_NAME(handler, vec) \
|
|
_ ## handler ## _vector_ ## vec ## _stub
|
|
|
|
#define _EXCEPTION_STUB_NAME(handler, vec) \
|
|
__EXCEPTION_STUB_NAME(handler, vec) \
|
|
|
|
/* Unfortunately, GCC extended asm doesn't work at toplevel so we need
|
|
* to stringify stuff.
|
|
*
|
|
* What we are doing here is generating entires in the .intList section
|
|
* and also the assembly language stubs for the exception. We use
|
|
* .gnu.linkonce section prefix so that the linker only includes the
|
|
* first one of these it encounters for a particular vector. In this
|
|
* way it's easy for applications or drivers to install custom exception
|
|
* handlers without having to #ifdef out previous instances such as in
|
|
* arch/x86/core/fatal.c
|
|
*/
|
|
#define __EXCEPTION_CONNECT(handler, vector, dpl, codepush) \
|
|
__asm__ ( \
|
|
_EXCEPTION_INTLIST(vector, dpl) \
|
|
".pushsection .gnu.linkonce.t.exc_" STRINGIFY(vector) \
|
|
"_stub, \"ax\"\n\t" \
|
|
".global " STRINGIFY(_EXCEPTION_STUB_NAME(handler, vector)) "\n\t" \
|
|
STRINGIFY(_EXCEPTION_STUB_NAME(handler, vector)) ":\n\t" \
|
|
"1:\n\t" \
|
|
codepush \
|
|
"push $" STRINGIFY(handler) "\n\t" \
|
|
"jmp _exception_enter\n\t" \
|
|
".popsection\n\t" \
|
|
)
|
|
|
|
|
|
/**
|
|
* @brief Connect an exception handler that doesn't expect error code
|
|
*
|
|
* Assign an exception handler to a particular vector in the IDT.
|
|
*
|
|
* @param handler A handler function of the prototype
|
|
* void handler(const z_arch_esf_t *esf)
|
|
* @param vector Vector index in the IDT
|
|
*/
|
|
#define _EXCEPTION_CONNECT_NOCODE(handler, vector, dpl) \
|
|
__EXCEPTION_CONNECT(handler, vector, dpl, "push $0\n\t")
|
|
|
|
/**
|
|
* @brief Connect an exception handler that does expect error code
|
|
*
|
|
* Assign an exception handler to a particular vector in the IDT.
|
|
* The error code will be accessible in esf->errorCode
|
|
*
|
|
* @param handler A handler function of the prototype
|
|
* void handler(const z_arch_esf_t *esf)
|
|
* @param vector Vector index in the IDT
|
|
*/
|
|
#define _EXCEPTION_CONNECT_CODE(handler, vector, dpl) \
|
|
__EXCEPTION_CONNECT(handler, vector, dpl, "")
|
|
|
|
#endif /* _ASMLANGUAGE */
|
|
|
|
#endif /* ZEPHYR_ARCH_X86_INCLUDE_IA32_EXCEPTION_H_ */
|