You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
80 lines
2.5 KiB
80 lines
2.5 KiB
#pragma once
|
|
|
|
#include "arch/common.h"
|
|
|
|
/*
|
|
* This header is the single entry point into the arch_context code.
|
|
* It includes processor independent code and conditionally includes architecture
|
|
* dependent code.
|
|
*/
|
|
|
|
/*
|
|
* These preprocessor conditionals load architecture-dependent code.
|
|
*
|
|
* Each of these headers include common.h, a sibling header that contains common
|
|
* structures, enums, and externs used by the processor independent code. Those
|
|
* definitions are thus transitively loaded here with the appropriate architecture
|
|
* specific code.
|
|
*
|
|
* While the code in common.h could be located in this file above the conditionals,
|
|
* structuring the code as such prevents IDEs from knowing how to resolve the
|
|
* symbols when aarch64/context.h or x86_64/context is the active file.
|
|
*/
|
|
#if defined(AARCH64) || defined(aarch64)
|
|
#include "aarch64/context.h"
|
|
#elif defined(X86_64) || defined(x86_64)
|
|
#include "x86_64/context.h"
|
|
#else
|
|
#warning "Architecture not set. Using x86_64"
|
|
#define X86_64
|
|
#include "x86_64/context.h"
|
|
#endif
|
|
|
|
|
|
/**
|
|
* Restore a full mcontext
|
|
* Writes sandbox_context to active_context
|
|
* active_context was saved to the stack by a signal handler
|
|
* @param active_context - the context of the current worker thread
|
|
* @param sandbox_context - the context that we want to restore
|
|
*/
|
|
static inline void
|
|
arch_mcontext_restore(mcontext_t *active_context, struct arch_context *sandbox_context)
|
|
{
|
|
assert(active_context != NULL);
|
|
assert(sandbox_context != NULL);
|
|
|
|
/* Assumption: Base Context is only ever used by arch_context_switch */
|
|
assert(sandbox_context != &worker_thread_base_context);
|
|
|
|
/* Transitioning from Slow -> Running */
|
|
assert(sandbox_context->variant == ARCH_CONTEXT_VARIANT_SLOW);
|
|
sandbox_context->variant = ARCH_CONTEXT_VARIANT_RUNNING;
|
|
|
|
/* Restore mcontext */
|
|
memcpy(active_context, &sandbox_context->mctx, sizeof(mcontext_t));
|
|
}
|
|
|
|
|
|
/**
|
|
* Save the full mcontext of the currently executing process
|
|
* @param sandbox_context - destination
|
|
* @param active_context - source
|
|
*/
|
|
static inline void
|
|
arch_mcontext_save(struct arch_context *sandbox_context, const mcontext_t *active_context)
|
|
{
|
|
assert(sandbox_context != NULL);
|
|
assert(active_context != NULL);
|
|
|
|
/* Assumption: The base context should never be modified */
|
|
assert(sandbox_context != &worker_thread_base_context);
|
|
|
|
/* Transitioning from Running -> Slow */
|
|
assert(sandbox_context->variant == ARCH_CONTEXT_VARIANT_RUNNING);
|
|
sandbox_context->variant = ARCH_CONTEXT_VARIANT_SLOW;
|
|
|
|
/* Copy mcontext */
|
|
memcpy(&sandbox_context->mctx, active_context, sizeof(mcontext_t));
|
|
}
|