d06fbd35c8
The port more or less fully works now, except for actual interrupt driven io and proper atomics. Also hit a floating point exception in the string benchmark.
74 lines
1.6 KiB
ArmAsm
74 lines
1.6 KiB
ArmAsm
/*
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* Copyright (c) 2019 Travis Geiselbrecht
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*
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* Use of this source code is governed by a MIT-style
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* license that can be found in the LICENSE file or at
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* https://opensource.org/licenses/MIT
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*/
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#include <lk/asm.h>
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#include <arch/vax.h>
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// a global label, but not typed as a function
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#define GLABEL(x) .globl x; x:
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.text
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// first level exception vectors must be 4 byte aligned
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.balign 4
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GLABEL(vax_undefined_exception)
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halt
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// for every possible exception handler, build a veneer routine that pushes
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// the exception number to the stack and branches to a common routine
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.balign 16
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GLABEL(vax_exception_table)
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.set i, 0
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.rept (SCB_MAX_OFFSET / 4)
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pushl $i
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jbr interrupt_common
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.balign 16
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.set i, i + 1
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.endr
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END_DATA(vax_exception_table)
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.align 4
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GLABEL(interrupt_common)
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halt
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END_FUNCTION(interrupt_common)
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.align 4
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GLABEL(_vax_mcheck)
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halt
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END_FUNCTION(_vax_mcheck)
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.align 4
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GLABEL(_vax_invkstk)
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halt
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END_FUNCTION(_vax_invkstk)
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.align 4
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GLABEL(_vax_interval_timer)
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pushr $0xfff
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calls $0,vax_interval_timer
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popr $0xfff
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rei
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END_FUNCTION(_vax_interval_timer)
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// fill in a pre-computed SCB with a few vectors that we care about
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#define SEEK(x) .org (x + SCB)
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#define SCB_VECTOR(offset, funct, stack) SEEK(offset); .long funct + stack
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.section .data
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.balign 4
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DATA(SCB)
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SCB_VECTOR(4, _vax_mcheck, SCB_FLAG_INT_STACK)
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SCB_VECTOR(8, _vax_invkstk, SCB_FLAG_INT_STACK)
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//SCB_VECTOR(40, _vax_syscall, SCB_FLAG_KERNEL_STACK)
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SCB_VECTOR(0xc0, _vax_interval_timer, SCB_FLAG_KERNEL_STACK)
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SEEK(SCB_MAX_OFFSET)
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END_DATA(SCB)
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