diff options
Diffstat (limited to 'meson/test cases/unit/78 nostdlib/subprojects/mylibc')
4 files changed, 61 insertions, 0 deletions
diff --git a/meson/test cases/unit/78 nostdlib/subprojects/mylibc/libc.c b/meson/test cases/unit/78 nostdlib/subprojects/mylibc/libc.c new file mode 100644 index 000000000..67261cb1d --- /dev/null +++ b/meson/test cases/unit/78 nostdlib/subprojects/mylibc/libc.c @@ -0,0 +1,35 @@ +/* Do not use this as the basis of your own libc. + * The code is probably unoptimal or wonky, as I + * had no prior experience with this, but instead + * just fiddled with the code until it worked. + */ + +#include<stdio.h> + +#define STDOUT 1 +#define SYS_WRITE 4 + +int simple_print(const char *msg, const long bufsize) { + int count; + long total_written = 0; + while(total_written < bufsize) { + asm( + "int $0x80\n\t" + : "=a"(count) + : "0"(SYS_WRITE), "b"(STDOUT), "c"(msg+total_written), "d"(bufsize-total_written) + :); + if(count == 0) { + return 1; + } + total_written += count; + } + return 0; +} + +int simple_strlen(const char *str) { + int len = 0; + while(str[len] != '\0') { + len++; + } + return len; +} diff --git a/meson/test cases/unit/78 nostdlib/subprojects/mylibc/meson.build b/meson/test cases/unit/78 nostdlib/subprojects/mylibc/meson.build new file mode 100644 index 000000000..ff4bdb20f --- /dev/null +++ b/meson/test cases/unit/78 nostdlib/subprojects/mylibc/meson.build @@ -0,0 +1,13 @@ +project('own libc', 'c') + +# A very simple libc implementation + +# Do not specify -nostdlib & co. They come from cross specifications. + +libc = static_library('c', 'libc.c', 'stubstart.s') + +mylibc_dep = declare_dependency(link_with : libc, + include_directories : include_directories('.') +) + +meson.override_dependency('c_stdlib', mylibc_dep) diff --git a/meson/test cases/unit/78 nostdlib/subprojects/mylibc/stdio.h b/meson/test cases/unit/78 nostdlib/subprojects/mylibc/stdio.h new file mode 100644 index 000000000..c3f8f56ca --- /dev/null +++ b/meson/test cases/unit/78 nostdlib/subprojects/mylibc/stdio.h @@ -0,0 +1,5 @@ +#pragma once + +int simple_print(const char *msg, const long bufsize); + +int simple_strlen(const char *str); diff --git a/meson/test cases/unit/78 nostdlib/subprojects/mylibc/stubstart.s b/meson/test cases/unit/78 nostdlib/subprojects/mylibc/stubstart.s new file mode 100644 index 000000000..0a6d9729a --- /dev/null +++ b/meson/test cases/unit/78 nostdlib/subprojects/mylibc/stubstart.s @@ -0,0 +1,8 @@ +.globl _start + +_start: + + call main + movl %eax, %ebx + movl $1, %eax + int $0x80 |