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Add read support for mips

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This commit is contained in:
Lucas Schumacher 2025-04-14 18:01:31 -04:00
parent 8a01908b1c
commit 6a51f8851b
3 changed files with 15 additions and 5 deletions
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16
arch/mips.c
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@ -28,7 +28,21 @@ intptr_t write(int32_t fd, const void* buf, intptr_t size){
); );
return n_written; 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(){ uint32_t fork(){
int rtn; int rtn;

2
buildtest.c
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@ -25,14 +25,12 @@ int main() {
if(pid == 0) return 0; if(pid == 0) return 0;
//TODO: wait on child to remove zombie process //TODO: wait on child to remove zombie process
#if defined(__x86_64__) || defined(__aarch64__)
// Test the read syscall // Test the read syscall
#define INPUT_BUFFER_LEN 4096 #define INPUT_BUFFER_LEN 4096
char input_buffer[INPUT_BUFFER_LEN] = {0}; char input_buffer[INPUT_BUFFER_LEN] = {0};
write(STDIO, "Enter some text:", 16); write(STDIO, "Enter some text:", 16);
intptr_t n_read = read(STDIO, input_buffer, INPUT_BUFFER_LEN); intptr_t n_read = read(STDIO, input_buffer, INPUT_BUFFER_LEN);
write(STDIO, input_buffer, n_read); write(STDIO, input_buffer, n_read);
#endif
return 69; return 69;
} }

2
sys.h
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@ -6,9 +6,7 @@ void exit(int8_t status);
#define STDIO 1 #define STDIO 1
#define STDERR 2 #define STDERR 2
intptr_t write(int32_t fd, const void* buf, intptr_t size); 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); intptr_t read(int32_t fd, const void* buf, intptr_t size);
#endif
uint32_t fork(); uint32_t fork();