x86: better separation for i386 specific code
That's it, nothing major is gonna happen anymore until i get amd64 support working and deprecate the entire i386 branch. 32-bit just adds so many extra complications to memory management that i don't want to waste any more energy on this platform which is obsolete anyway.main
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/* See the end of this file for copyright and license terms. */
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#pragma once
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#ifndef _ARCH_INTERRUPT_H_
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#error "This file is not meant to be included directly, use <arch/interrupt.h>"
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#endif
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/**
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* @brief A hardware stack frame on i386.
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* I have no idea whether x86 people are actually calling it hardware stack
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* frame tbh, this is just the (ARM) terminology i'm used to. Either way,
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* this is what gets pushed to the stack automatically when entering an ISR.
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*/
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struct i386_hw_frame {
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u32 eip;
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u16 cs; u16 _pad0;
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u32 eflags;
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/*
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* On i386, these two are only pushed when entering from another
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* (i.e. lower) privilege level (???). This effectively means they don't
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* exist unless the CS above is equal to X86_USER_CS (arch/segment.h).
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*/
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u32 user_esp;
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u16 user_ss; u16 _pad1;
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} __packed;
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/*
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* This file is part of GayBSD.
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* Copyright (c) 2021 fef <owo@fef.moe>.
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*
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* GayBSD is nonviolent software: you may only use, redistribute, and/or
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* modify it under the terms of the Cooperative Nonviolent Public License
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* (CNPL) as found in the LICENSE file in the source code root directory
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* or at <https://git.pixie.town/thufie/npl-builder>; either version 7
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* of the license, or (at your option) any later version.
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*
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* GayBSD comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPL for details.
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*/
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/* See the end of this file for copyright and license terms. */
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#pragma once
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#ifndef _ARCH_TRAP_H_
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#error "This file is not meant to be included directly, use <arch/trap.h>"
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#endif
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/**
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* @brief Complete context save on the i386.
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*/
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struct i386_trap_frame {
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/* extra pointer pushed manually, see the assembly routines */
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struct i386_hw_frame *hw_frame;
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u32 edi;
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u32 esi;
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u32 ebp;
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u32 esp;
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u32 ebx;
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u32 edx;
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u32 ecx;
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u32 eax;
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} __packed;
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typedef struct i386_trap_frame trap_frame_t;
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/*
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* This file is part of GayBSD.
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* Copyright (c) 2021 fef <owo@fef.moe>.
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*
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* GayBSD is nonviolent software: you may only use, redistribute, and/or
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* modify it under the terms of the Cooperative Nonviolent Public License
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* (CNPL) as found in the LICENSE file in the source code root directory
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* or at <https://git.pixie.town/thufie/npl-builder>; either version 7
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* of the license, or (at your option) any later version.
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*
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* GayBSD comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPL for details.
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*/
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/* See the end of this file for copyright and license terms. */
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#include <arch/segment.h>
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#include <arch/trap.h>
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#include <gay/kprintf.h>
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#include <gay/systm.h>
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void print_regs(const struct i386_trap_frame *ctx)
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{
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u32 esp;
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if (ctx->hw_frame->cs == X86_USER_CS)
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esp = ctx->hw_frame->user_esp;
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else
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esp = ctx->esp - 3 * 4; /* eip, cs, eflags */
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kprintf("EIP = %#x:%#08x\n", ctx->hw_frame->cs, ctx->hw_frame->eip);
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kprintf("EFLAGS = %#08x\n", ctx->hw_frame->eflags);
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kprintf("EAX = %#08x EDI = %#08x\n", ctx->eax, ctx->edi);
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kprintf("EBX = %#08x ESI = %#08x\n", ctx->ebx, ctx->esi);
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kprintf("ECX = %#08x ESP = %#08x\n", ctx->ecx, esp);
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kprintf("EDX = %#08x EBP = %#08x\n", ctx->edx, ctx->ebp);
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}
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/*
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* This file is part of GayBSD.
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* Copyright (c) 2021 fef <owo@fef.moe>.
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*
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* GayBSD is nonviolent software: you may only use, redistribute, and/or
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* modify it under the terms of the Cooperative Nonviolent Public License
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* (CNPL) as found in the LICENSE file in the source code root directory
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* or at <https://git.pixie.town/thufie/npl-builder>; either version 7
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* of the license, or (at your option) any later version.
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*
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* GayBSD comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPL for details.
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*/
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