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The SET_INTERRUPT_HANDLER macro in interrupt.h used an inline assembly feature to cause GCC to generate a unique number for a trampoline label. Clang compiled the code using that feature without generating any compile-time errors, but it always generated the number 0, resulting in all interrupt trampolines having the same label names. This patch replaces the usage of that feature with local labels, which are supported by both GCC and Clang. See https://sourceware.org/binutils/docs/as/Symbol-Names.html for an explanation of local labels.
107 lines
4.7 KiB
C
107 lines
4.7 KiB
C
/*
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* Copyright (C) 2015, Intel Corporation. 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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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef INTERRUPT_H
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#define INTERRUPT_H
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#include <stdint.h>
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#include "idt.h"
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struct interrupt_context {
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uint32_t edi;
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uint32_t esi;
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uint32_t ebp;
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uint32_t esp;
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uint32_t ebx;
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uint32_t edx;
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uint32_t ecx;
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uint32_t eax;
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uint32_t error_code;
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uint32_t eip;
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};
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/* Helper macro to register interrupt handler function.
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*
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* num: Interrupt number (0-255)
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* has_error_code: 0 if interrupt doesn't push error code onto the
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* stack. Otherwise, set this argument to 1.
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* handler: Pointer to function that should be called once the
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* interrupt is raised. In case has_error_code == 0
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* the function prototype should be the following:
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* void handler(void)
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* Otherwise, it should be:
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* void handler(struct interrupt_context context)
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*
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* Since there is no easy way to write an Interrupt Service Routines
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* (ISR) in C (for further information on this, see [1]), we provide
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* this helper macro. It basically provides an assembly trampoline
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* to a C function (handler parameter) which, indeed, handles the
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* interrupt.
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*
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* [1] http://wiki.osdev.org/Interrupt_Service_Routines
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*/
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#define SET_INTERRUPT_HANDLER(num, has_error_code, handler) \
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do { \
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__asm__ __volatile__ ( \
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"push $1f\n\t" \
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"push %0\n\t" \
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"call %P1\n\t" \
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"add $8, %%esp\n\t" \
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"jmp 2f\n\t" \
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".align 4\n\t" \
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"1:\n\t" \
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" pushal\n\t" \
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" call %P2\n\t" \
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" popal\n\t" \
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" .if " #has_error_code "\n\t" \
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" add $4, %%esp\n\t" \
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" .endif\n\t" \
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" iret\n\t" \
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"2:\n\t" \
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:: "g" (num), "i" (idt_set_intr_gate_desc), "i" (handler) \
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: "eax", "ecx", "edx" \
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); \
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} while (0)
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/* Disable maskable hardware interrupts */
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#define DISABLE_IRQ() \
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do { \
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__asm__ ("cli"); \
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} while (0)
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/* Enable maskable hardware interrupts */
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#define ENABLE_IRQ() \
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do { \
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__asm__ ("sti"); \
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} while (0)
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#endif /* INTERRUPT_H */
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