Merge pull request #3326 from LemonBoy/misc-misc

Miscellaneous and very small patches regarding mipsel and musl libc

Author: andrewrk

lib/libc/musl/src/setjmp/mips/longjmp.S

@@ -12,18 +12,12 @@ longjmp:
 	addu    $2, $2, 1
 1:
 #ifndef __mips_soft_float
-	lwc1    $20, 56($4)
-	lwc1    $21, 60($4)
-	lwc1    $22, 64($4)
-	lwc1    $23, 68($4)
-	lwc1    $24, 72($4)
-	lwc1    $25, 76($4)
-	lwc1    $26, 80($4)
-	lwc1    $27, 84($4)
-	lwc1    $28, 88($4)
-	lwc1    $29, 92($4)
-	lwc1    $30, 96($4)
-	lwc1    $31, 100($4)
+	l.d     $f20, 56($4)
+	l.d     $f22, 64($4)
+	l.d     $f24, 72($4)
+	l.d     $f26, 80($4)
+	l.d     $f28, 88($4)
+	l.d     $f30, 96($4)
 #endif
 	lw      $ra,  0($4)
 	lw      $sp,  4($4)

lib/libc/musl/src/setjmp/mips/setjmp.S

@@ -22,18 +22,12 @@ setjmp:
 	sw      $30, 40($4)
 	sw      $28, 44($4)
 #ifndef __mips_soft_float
-	swc1    $20, 56($4)
-	swc1    $21, 60($4)
-	swc1    $22, 64($4)
-	swc1    $23, 68($4)
-	swc1    $24, 72($4)
-	swc1    $25, 76($4)
-	swc1    $26, 80($4)
-	swc1    $27, 84($4)
-	swc1    $28, 88($4)
-	swc1    $29, 92($4)
-	swc1    $30, 96($4)
-	swc1    $31, 100($4)
+	s.d     $f20, 56($4)
+	s.d     $f22, 64($4)
+	s.d     $f24, 72($4)
+	s.d     $f26, 80($4)
+	s.d     $f28, 88($4)
+	s.d     $f30, 96($4)
 #endif
 	jr      $ra
 	li      $2, 0

lib/std/os/linux.zig

@@ -193,9 +193,29 @@ pub fn umount2(special: [*]const u8, flags: u32) usize {
 
 pub fn mmap(address: ?[*]u8, length: usize, prot: usize, flags: u32, fd: i32, offset: u64) usize {
     if (@hasDecl(@This(), "SYS_mmap2")) {
-        return syscall6(SYS_mmap2, @ptrToInt(address), length, prot, flags, @bitCast(usize, isize(fd)), @truncate(usize, offset / MMAP2_UNIT));
+        // Make sure the offset is also specified in multiples of page size
+        if ((offset & (MMAP2_UNIT - 1)) != 0)
+            return @bitCast(usize, isize(-EINVAL));
+
+        return syscall6(
+            SYS_mmap2,
+            @ptrToInt(address),
+            length,
+            prot,
+            flags,
+            @bitCast(usize, isize(fd)),
+            @truncate(usize, offset / MMAP2_UNIT),
+        );
     } else {
-        return syscall6(SYS_mmap, @ptrToInt(address), length, prot, flags, @bitCast(usize, isize(fd)), offset);
+        return syscall6(
+            SYS_mmap,
+            @ptrToInt(address),
+            length,
+            prot,
+            flags,
+            @bitCast(usize, isize(fd)),
+            offset,
+        );
     }
 }
 

test/tests.zig

@@ -140,6 +140,16 @@ const test_targets = [_]TestTarget{
             },
         },
     },
+    TestTarget{
+        .target = Target{
+            .Cross = CrossTarget{
+                .os = .linux,
+                .arch = .mipsel,
+                .abi = .musl,
+            },
+        },
+        .link_libc = true,
+    },
 
     TestTarget{
         .target = Target{