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71 lines
2.0 KiB
71 lines
2.0 KiB
#pragma once
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#include <assert.h>
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#include <stdint.h>
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#include <string.h>
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#include <ucontext.h>
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#include <unistd.h>
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#include "software_interrupt.h"
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/*
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* This file contains the common dependencies of the architecture-dependent code.
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*
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* While all of the content in this file could alternatively be placed in context.h
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* above the conditional preprocessor includes, IDEs generally assume each file includes
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* their own dependent headers directly and form a clean independent subtree that
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* can be walked to resolve all symbols when the file is active
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*/
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typedef uint64_t reg_t;
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/* Register context saved and restored on user-level, direct context switches. */
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typedef enum
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{
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UREG_SP = 0,
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UREG_IP = 1,
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UREG_COUNT
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} ureg_t;
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/* The enum is compared directly in assembly, so maintain integral values! */
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typedef enum
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{
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ARCH_CONTEXT_VARIANT_UNUSED = 0, /* Has not have saved a context */
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ARCH_CONTEXT_VARIANT_FAST = 1, /* Saved a fastpath context */
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ARCH_CONTEXT_VARIANT_SLOW = 2, /* Saved a slowpath context */
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ARCH_CONTEXT_VARIANT_RUNNING = 3 /* Context is executing and content is out of date */
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} arch_context_variant_t;
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static inline char *
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arch_context_variant_print(arch_context_variant_t context)
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{
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switch (context) {
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case ARCH_CONTEXT_VARIANT_UNUSED:
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return "Unused";
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case ARCH_CONTEXT_VARIANT_FAST:
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return "Fast";
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case ARCH_CONTEXT_VARIANT_SLOW:
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return "Slow";
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case ARCH_CONTEXT_VARIANT_RUNNING:
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return "Running";
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default:
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panic("Encountered unexpected arch_context variant: %u\n", context);
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}
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}
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struct arch_context {
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arch_context_variant_t variant;
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reg_t regs[UREG_COUNT];
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mcontext_t mctx;
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};
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/*
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* This is the slowpath switch to a preempted sandbox!
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* SIGUSR1 on the current thread and restore mcontext there!
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*/
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extern __thread struct arch_context worker_thread_base_context;
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/* Cannot be inlined because called in assembly */
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void __attribute__((noinline)) __attribute__((noreturn)) arch_context_restore_preempted(void);
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