diff --git a/arch/mips.c b/arch/mips.c index 1d23708..0fdcf8c 100644 --- a/arch/mips.c +++ b/arch/mips.c @@ -28,7 +28,21 @@ intptr_t write(int32_t fd, const void* buf, intptr_t size){ ); return n_written; } -//intptr_t read(int32_t fd, const void* buf, intptr_t size); +intptr_t read(int32_t fd, const void* buf, intptr_t size){ + intptr_t n_read = 0; + asm volatile ( + "move $a0, %1\n" + "move $a1, %2\n" + "move $a2, %3\n" + "li $v0, 4004\n" + "syscall\n" + "move %0, $v0\n" + : "=r"(n_read) + : "r"(fd), "r"(buf), "r"(size) + : "a0", "a1", "a2", "v0" //TODO: temp registers clobbered by syscall should probably also be listed but this fn returns right away so it should be fine? + ); + return n_read; +} uint32_t fork(){ int rtn; diff --git a/buildtest.c b/buildtest.c index 9d659fe..20e9991 100644 --- a/buildtest.c +++ b/buildtest.c @@ -25,14 +25,12 @@ int main() { if(pid == 0) return 0; //TODO: wait on child to remove zombie process - #if defined(__x86_64__) || defined(__aarch64__) // Test the read syscall #define INPUT_BUFFER_LEN 4096 char input_buffer[INPUT_BUFFER_LEN] = {0}; write(STDIO, "Enter some text:", 16); intptr_t n_read = read(STDIO, input_buffer, INPUT_BUFFER_LEN); write(STDIO, input_buffer, n_read); - #endif return 69; } diff --git a/sys.h b/sys.h index 057bd51..c1ebc61 100644 --- a/sys.h +++ b/sys.h @@ -6,9 +6,7 @@ void exit(int8_t status); #define STDIO 1 #define STDERR 2 intptr_t write(int32_t fd, const void* buf, intptr_t size); -#if defined(__x86_64__) || defined(__aarch64__) intptr_t read(int32_t fd, const void* buf, intptr_t size); -#endif uint32_t fork();