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https://gitlab.com/qemu-project/qemu
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f278d5cbe5
Add the appropriate register constraints for the inline asm for the write and exit system calls. Without the correct constraints for the write() function, correct failure messages are not printed succesfully on newer version of GCC. Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Rabin Vincent <rabinv@axis.com> Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
60 lines
1.1 KiB
C
60 lines
1.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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static inline int mystrlen(char *s) {
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int i = 0;
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while (s[i])
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i++;
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return i;
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}
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void pass(void) {
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char s[] = "passed.\n";
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write (1, s, sizeof (s) - 1);
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exit (0);
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}
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void _fail(char *reason) {
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char s[] = "\nfailed: ";
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int len = mystrlen(reason);
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write (1, s, sizeof (s) - 1);
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write (1, reason, len);
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write (1, "\n", 1);
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// exit (1);
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}
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void *memset (void *s, int c, size_t n) {
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char *p = s;
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int i;
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for (i = 0; i < n; i++)
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p[i] = c;
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return p;
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}
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void exit (int status) {
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register unsigned int callno asm ("r9") = 1; /* NR_exit */
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asm volatile ("break 13\n"
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:
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: "r" (callno)
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: "memory" );
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while(1)
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;
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}
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ssize_t write (int fd, const void *buf, size_t count) {
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register unsigned int callno asm ("r9") = 4; /* NR_write */
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register unsigned int r10 asm ("r10") = fd;
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register const void *r11 asm ("r11") = buf;
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register size_t r12 asm ("r12") = count;
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register unsigned int r asm ("r10");
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asm volatile ("break 13\n"
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: "=r" (r)
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: "r" (callno), "0" (r10), "r" (r11), "r" (r12)
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: "memory");
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return r;
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}
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