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[WebAssembly] Cleanup syscall handling in wasm.js (#25)

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Also, ignore a couple of syscall by return 0 rather
than -1.  This allows the musl startup code to get
furthur.
This commit is contained in:
Sam Clegg 2017-11-17 17:01:15 -08:00 committed by GitHub
parent 1086c398e6
commit 6a45034cab
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1 changed files with 44 additions and 33 deletions
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77
arch/wasm32/wasm.js
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@ -286,7 +286,11 @@ var stdio = (function() {
return { return {
// Internal. // Internal.
__flush_stdout: function() { print(stdout_buf); stdout_buf = ''; }, __flush_stdout: function() {
if (stdout_buf[-1] = '\n')
stdout_buf = stdout_buf.slice(0, -1);
print(stdout_buf); stdout_buf = '';
},
// Constants. // Constants.
BUFSIZ: 0xffffffff, // TODO BUFSIZ: 0xffffffff, // TODO
@ -341,7 +345,10 @@ var stdio = (function() {
stdout_buf += String.fromCharCode(character); stdout_buf += String.fromCharCode(character);
return character; return character;
}, },
puts: function(str) { stdout_buf += stringFromHeap(str) + '\n'; }, puts: function(str) {
stdout_buf += stringFromHeap(str) + '\n';
stdio.__flush_stdout();
},
ungetc: NYI('ungetc'), ungetc: NYI('ungetc'),
// Direct input/output. // Direct input/output.
@ -1249,41 +1256,45 @@ syscall_names = {
375: "SYS_membarrier" 375: "SYS_membarrier"
} }
syscall_numbers = (function() {
mapping = {};
for (var num in syscall_names) {
mapping[syscall_names[num]] = num;
}
return mapping;
})();
function syscall_impl(n) {
arg_count = arguments.length - 1;
var msg = 'syscall' + arg_count + '(' + syscall_names[n];
for (var arg_num = 0; arg_num < arg_count; arg_num++) {
msg += ', ' + arguments[arg_num+1]
}
msg += ')';
print(msg);
var ignore_syscalls = [
syscall_numbers["SYS_set_thread_area"],
syscall_numbers["SYS_set_tid_address"]
];
if (ignore_syscalls.indexOf(n) != -1)
return 0;
return -1;
}
// Syscall API with C libraries. In theory this is the only JavaScript // Syscall API with C libraries. In theory this is the only JavaScript
// implementation we need. // implementation we need.
var syscall = (function() { var syscall = (function() {
return { return {
__syscall: function(n, args) { __syscall: syscall_impl,
print('syscall(' + syscall_names[n] + ', ' + args + ')'); __syscall0: syscall_impl,
return -1; }, __syscall1: syscall_impl,
__syscall0: function(n) { __syscall2: syscall_impl,
print('syscall0(' + syscall_names[n] + ')'); __syscall3: syscall_impl,
return -1; }, __syscall4: syscall_impl,
__syscall1: function(n, a) { __syscall5: syscall_impl,
print('syscall1(' + syscall_names[n] + ', ' + a + ')'); __syscall6: syscall_impl,
return -1; }, __syscall_cp: syscall_impl
__syscall2: function(n, a, b) { };
print('syscall2(' + syscall_names[n] + ', ' + a + ', ' + b + ')');
return -1; },
__syscall3: function(n, a, b, c) {
print('syscall3(' + syscall_names[n] + ', ' + a + ', ' + b + ', ' + c + ')');
return -1; },
__syscall4: function(n, a, b, c, d) {
print('syscall4(' + syscall_names[n] + ', ' + a + ', ' + b + ', ' + c + ', ' + d + ')');
return -1; },
__syscall5: function(n, a, b, c, d, e) {
print('syscall4(' + syscall_names[n] + ', ' + a + ', ' + b + ', ' + c + ', ' + d + ', ' +
e + ')');
return -1; },
__syscall6: function(n, a, b, c, d, e, f) {
print('syscall6(' + syscall_names[n] + ', ' + a + ', ' + b + ', ' + c + ', ' + d + ', ' +
e + ', ' + f + ')');
return -1; },
__syscall_cp: function(n, a, b, c, d, e, f) {
print('syscall_cp(' + syscall_names[n] + ', ' + a + ', ' + b + ', ' + c + ', ' + d + ', ' +
e + ', ' + f + ')');
return -1; }
};
})(); })();
// Start with the stub implementations. Further module loads may shadow them. // Start with the stub implementations. Further module loads may shadow them.