diff options
| author | Helge Deller <deller@gmx.de> | 2018-08-16 22:36:26 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2018-08-17 16:45:41 +0200 |
| commit | 54c770da992387abfa7df4817404d000ef034fa8 (patch) | |
| tree | 9b0ee831c9e12dca09ed6f4599ee0a7f56b9bb53 /arch/parisc/kernel/syscall.S | |
| parent | b6fc0cccb6b35815a7d1cfc9279cdbfc2c61d00d (diff) | |
| download | linux-54c770da992387abfa7df4817404d000ef034fa8.tar.bz2 | |
parisc: Update comments in syscall.S regarding wide userland
We do support running 64-bit userspace processes, although there isn't
yet full gcc and glibc support. Anyway, fix the comments to reflect the
reality.
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc/kernel/syscall.S')
| -rw-r--r-- | arch/parisc/kernel/syscall.S | 13 |
1 files changed, 3 insertions, 10 deletions
diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S index be451766e9d0..f453997a7b8f 100644 --- a/arch/parisc/kernel/syscall.S +++ b/arch/parisc/kernel/syscall.S @@ -108,12 +108,8 @@ linux_gateway_entry: mtsp %r0,%sr6 /* get kernel space into sr6 */ #ifdef CONFIG_64BIT - /* for now we can *always* set the W bit on entry to the syscall - * since we don't support wide userland processes. We could - * also save the current SM other than in r0 and restore it on - * exit from the syscall, and also use that value to know - * whether to do narrow or wide syscalls. -PB - */ + /* Store W bit on entry to the syscall in case it's a wide userland + * process. */ ssm PSW_SM_W, %r1 extrd,u %r1,PSW_W_BIT,1,%r1 /* sp must be aligned on 4, so deposit the W bit setting into @@ -478,16 +474,13 @@ tracesys_sigexit: lws_start: #ifdef CONFIG_64BIT - /* FIXME: If we are a 64-bit kernel just - * turn this on unconditionally. - */ ssm PSW_SM_W, %r1 extrd,u %r1,PSW_W_BIT,1,%r1 /* sp must be aligned on 4, so deposit the W bit setting into * the bottom of sp temporarily */ or,ev %r1,%r30,%r30 - /* Clip LWS number to a 32-bit value always */ + /* Clip LWS number to a 32-bit value for 32-bit processes */ depdi 0, 31, 32, %r20 #endif |