62c559043d
The syscall/sysret instructions don't swap stacks. This was bad but passable until syscalls caused the scheduler to run, and scheduling a task that paused due to interrupt. Adding a new (hopefully temporary) syscall interrupt `int 0xee` to allow me to test syscalls without stack issues before I tackle the syscall/sysret issue. Also implemented a basic `pause` syscall that causes the calling process to become unready. Because nothing can wake a process yet, it never returns.
66 lines
965 B
ArmAsm
66 lines
965 B
ArmAsm
%include "push_all.inc"
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extern isr_handler
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global isr_handler_prelude
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isr_handler_prelude:
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push_all_and_segments
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mov rdi, rsp
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call isr_handler
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mov rsp, rax
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pop_all_and_segments
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add rsp, 16 ; because the ISRs added err/num
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sti
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iretq
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extern irq_handler
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global irq_handler_prelude
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irq_handler_prelude:
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push_all_and_segments
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mov rdi, rsp
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call irq_handler
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mov rsp, rax
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pop_all_and_segments
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add rsp, 16 ; because the ISRs added err/num
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sti
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iretq
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%macro EMIT_ISR 2
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global %1
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%1:
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cli
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push 0
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push %2
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jmp isr_handler_prelude
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%endmacro
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%macro EMIT_EISR 2
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global %1
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%1:
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cli
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push %2
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jmp isr_handler_prelude
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%endmacro
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%macro EMIT_IRQ 2
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global %1
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%1:
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cli
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push 0
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push %2
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jmp irq_handler_prelude
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%endmacro
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%define EISR(i, name) EMIT_EISR name, i
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%define UISR(i, name) EMIT_ISR name, i
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%define ISR(i, name) EMIT_ISR name, i
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%define IRQ(i, q, name) EMIT_IRQ name, i
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section .isrs
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%include "interrupt_isrs.inc"
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