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syscall: fix NaCl

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missing from last CL, sorry

R=r
CC=golang-dev
https://golang.org/cl/2214043
This commit is contained in:
Russ Cox 2010-09-19 23:28:45 -04:00
parent 33c4ff0669
commit 950ee18366
1 changed files with 14 additions and 3 deletions
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17
src/pkg/syscall/mksyscall.sh
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@ -16,6 +16,7 @@
$cmdline = "mksyscall.sh " . join(' ', @ARGV);
$errors = 0;
$_32bit = "";
$nacl = 0;
if($ARGV[0] eq "-b32") {
$_32bit = "big-endian";
@ -24,6 +25,10 @@ if($ARGV[0] eq "-b32") {
$_32bit = "little-endian";
shift;
}
if($ARGV[0] eq "-nacl") {
$nacl = 1;
shift;
}
if($ARGV[0] =~ /^-/) {
print STDERR "usage: mksyscall.sh [-b32 | -l32] [file ...]\n";
@ -89,9 +94,15 @@ while(<>) {
# Convert slice into pointer, length.
# Have to be careful not to take address of &a[0] if len == 0:
# pass nil in that case.
$text .= "\tvar _p$n *$1\n";
$text .= "\tif len($name) > 0 {\n\t\t_p$n = \&${name}[0]\n\t}\n";
push @args, "uintptr(unsafe.Pointer(_p$n))", "uintptr(len($name))";
$text .= "\tvar _p$n unsafe.Pointer\n";
$text .= "\tif len($name) > 0 {\n\t\t_p$n = unsafe.Pointer(\&${name}[0])\n\t}";
if($nacl) {
# NaCl rejects zero length write with nil pointer,
# so use non-nil pointer.
$text .= " else {\n\t\t_p$n = unsafe.Pointer(&_zero[0])\n\t}";
}
$text .= "\n";
push @args, "uintptr(_p$n)", "uintptr(len($name))";
$n++;
} elsif($type eq "int64" && $_32bit ne "") {
if($_32bit eq "big-endian") {