40 lines
907 B
C++
40 lines
907 B
C++
#include "context.h"
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#include "../../rust.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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extern "C" void CDECL swap_registers(registers_t *oregs,
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registers_t *regs)
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asm ("swap_registers");
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context::context()
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{
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assert((void*)®s == (void*)this);
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}
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void context::swap(context &out)
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{
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swap_registers(&out.regs, ®s);
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}
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void context::call(void *f, void *arg, void *stack) {
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// Get the current context, which we will then modify to call the
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// given function.
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swap(*this);
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// set up the stack
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uint64_t *sp = (uint64_t *)stack;
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sp = align_down(sp);
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// The final return address. 0 indicates the bottom of the stack
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*--sp = 0;
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regs.data[RUSTRT_ARG0] = (uint64_t)arg;
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regs.data[RUSTRT_RSP] = (uint64_t)sp;
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regs.data[RUSTRT_IP] = (uint64_t)f;
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// Last base pointer on the stack should be 0
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regs.data[RUSTRT_RBP] = 0;
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}
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