derek.holloway
7502bf64a4
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111 lines
3.4 KiB
C
111 lines
3.4 KiB
C
#include <stdio.h>
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// For the test case, we really want the the layout of this binary
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// to be:
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//
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// foo()
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// bar() - 4096 bytes of nop's
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// main()
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// "HI" string
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//
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// in reality getting this layout from the compiler and linker
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// is a crapshoot, so I have yaml's checked in of the correct
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// layout. Recompiling from source may not get the needed
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// binary layout.
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static int bar();
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static int foo() { return 5 + bar(); }
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// A function of 4096 bytes, so when main() loads the
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// address of foo() before this one, it has to subtract
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// a 4096 page.
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#define SIXTY_FOUR_BYTES_NOP \
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asm("nop"); \
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asm("nop"); \
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asm("nop"); \
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asm("nop"); \
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asm("nop"); \
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asm("nop"); \
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asm("nop"); \
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asm("nop"); \
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asm("nop"); \
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asm("nop"); \
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asm("nop"); \
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asm("nop"); \
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asm("nop"); \
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asm("nop"); \
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asm("nop"); \
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asm("nop");
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static int bar() {
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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SIXTY_FOUR_BYTES_NOP;
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return 5;
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}
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int main() {
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int (*f)(void) = foo;
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puts("HI");
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return f();
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}
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