| 1 | // This header provides replacements for certain libc functions. It is necessary |
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| 2 | // in order to safely run the tests on aarch64, because the system libc might |
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| 3 | // not have been compiled with -ffixed-x18. |
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| 4 | |
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| 5 | #pragma once |
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| 6 | |
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| 7 | #include <stddef.h> |
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| 8 | #include <stdint.h> |
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| 9 | #include <stdio.h> |
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| 10 | |
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| 11 | #ifdef __aarch64__ |
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| 12 | |
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| 13 | size_t scs_strlen(const char *p) { |
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| 14 | size_t retval = 0; |
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| 15 | while (*p++) |
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| 16 | retval++; |
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| 17 | return retval; |
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| 18 | } |
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| 19 | |
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| 20 | // We mark this function as noinline to make sure that its callers do not |
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| 21 | // become leaf functions as a result of inlining. This is because we want to |
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| 22 | // make sure that we generate the correct code for non-leaf functions. |
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| 23 | |
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| 24 | __attribute__((noinline)) void scs_fputs_stdout(const char *p) { |
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| 25 | __asm__ __volatile__( |
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| 26 | "mov x0, #1\n" // stdout |
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| 27 | "mov x1, %0\n" |
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| 28 | "mov x2, %1\n" |
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| 29 | "mov x8, #64\n" // write |
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| 30 | "svc #0\n" ::"r" (p), |
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| 31 | "r" (scs_strlen(p)) |
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| 32 | : "x0" , "x1" , "x2" , "x8" ); |
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| 33 | } |
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| 34 | |
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| 35 | #else |
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| 36 | #error Unsupported platform |
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| 37 | #endif |
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| 38 | |
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