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Diffstat (limited to 'Build/source/libs/libpng/libpng-src/contrib/mips-msa/linux.c')
-rw-r--r--Build/source/libs/libpng/libpng-src/contrib/mips-msa/linux.c58
1 files changed, 23 insertions, 35 deletions
diff --git a/Build/source/libs/libpng/libpng-src/contrib/mips-msa/linux.c b/Build/source/libs/libpng/libpng-src/contrib/mips-msa/linux.c
index 3bac6111b79..cae8ca50ffc 100644
--- a/Build/source/libs/libpng/libpng-src/contrib/mips-msa/linux.c
+++ b/Build/source/libs/libpng/libpng-src/contrib/mips-msa/linux.c
@@ -1,67 +1,55 @@
/* contrib/mips-msa/linux.c
*
- * Copyright (c) 2020 Cosmin Truta
+ * Copyright (c) 2020-2023 Cosmin Truta
* Copyright (c) 2016 Glenn Randers-Pehrson
* Written by Mandar Sahastrabuddhe, 2016.
+ * Updated by Sui Jingfeng, 2021.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
- * SEE contrib/mips-msa/README before reporting bugs
+ * On Linux, png_have_msa is implemented by reading the pseudo-file
+ * "/proc/self/auxv".
+ *
+ * See contrib/mips-msa/README before reporting bugs.
*
* STATUS: SUPPORTED
* BUG REPORTS: png-mng-implement@sourceforge.net
- *
- * png_have_msa implemented for Linux by reading the widely available
- * pseudo-file /proc/cpuinfo.
- *
- * This code is strict ANSI-C and is probably moderately portable; it does
- * however use <stdio.h> and it assumes that /proc/cpuinfo is never localized.
*/
-#include <stdio.h>
-#include <string.h>
+#include <elf.h>
+#include <fcntl.h>
#include <stdlib.h>
+#include <unistd.h>
static int
png_have_msa(png_structp png_ptr)
{
- FILE *f = fopen("/proc/cpuinfo", "rb");
+ Elf64_auxv_t aux;
+ int fd;
+ int has_msa = 0;
- char *string = "msa";
- char word[10];
-
- if (f != NULL)
+ fd = open("/proc/self/auxv", O_RDONLY);
+ if (fd >= 0)
{
- while(!feof(f))
+ while (read(fd, &aux, sizeof(Elf64_auxv_t)) == sizeof(Elf64_auxv_t))
{
- int ch = fgetc(f);
- static int i = 0;
-
- while(!(ch <= 32))
+ if (aux.a_type == AT_HWCAP)
{
- word[i++] = ch;
- ch = fgetc(f);
- }
-
- int val = strcmp(string, word);
+ uint64_t hwcap = aux.a_un.a_val;
- if (val == 0) {
- fclose(f);
- return 1;
+ has_msa = (hwcap >> 1) & 1;
+ break;
}
-
- i = 0;
- memset(word, 0, 10);
}
-
- fclose(f);
+ close(fd);
}
#ifdef PNG_WARNINGS_SUPPORTED
else
- png_warning(png_ptr, "/proc/cpuinfo open failed");
+ png_warning(png_ptr, "/proc/self/auxv open failed");
#endif
- return 0;
+
+ return has_msa;
}