BMC/Intel-BMC/linux.git/arch/x86/entry/syscalls, branch dev-5.8

vfs: add faccessat2 syscall

2020-05-14T14:44:25+00:00

POSIX defines faccessat() as having a fourth "flags" argument, while the linux syscall doesn't have it. Glibc tries to emulate AT_EACCESS and AT_SYMLINK_NOFOLLOW, but AT_EACCESS emulation is broken. Add a new faccessat(2) syscall with the added flags argument and implement both flags. The value of AT_EACCESS is defined in glibc headers to be the same as AT_REMOVEDIR. Use this value for the kernel interface as well, together with the explanatory comment. Also add AT_EMPTY_PATH support, which is not documented by POSIX, but can be useful and is trivial to implement. Signed-off-by: Miklos Szeredi

x86/entry/32: Use IA32-specific wrappers for syscalls taking 64-bit arguments

2020-03-21T15:03:24+00:00

For the 32-bit syscall interface, 64-bit arguments (loff_t) are passed via a pair of 32-bit registers. These register pairs end up in consecutive stack slots, which matches the C ABI for 64-bit arguments. But when accessing the registers directly from pt_regs, the wrapper needs to manually reassemble the 64-bit value. These wrappers already exist for 32-bit compat, so make them available to 32-bit native in preparation for enabling pt_regs-based syscalls. Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Reviewed-by: Dominik Brodowski Link: https://lkml.kernel.org/r/20200313195144.164260-16-brgerst@gmail.com

x86/entry/32: Rename 32-bit specific syscalls

2020-03-21T15:03:23+00:00

Rename the syscalls that only exist for 32-bit from x86_* to ia32_* to make it clear they are for 32-bit only. Also rename the functions to match the syscall name. Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Reviewed-by: Dominik Brodowski Link: https://lkml.kernel.org/r/20200313195144.164260-15-brgerst@gmail.com

x86/entry/32: Clean up syscall_32.tbl

2020-03-21T15:03:23+00:00

After removal of the __ia32_ prefix, remove compat entries that are now identical to the native entry. Converted with this script and fixing up whitespace: while read nr abi name entry compat; do if [ "${nr:0:1}" = "#" ]; then echo $nr $abi $name $entry $compat continue fi if [ "$entry" = "$compat" ]; then compat="" fi echo "$nr $abi $name $entry $compat" done Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Link: https://lkml.kernel.org/r/20200313195144.164260-14-brgerst@gmail.com

x86/entry: Remove ABI prefixes from functions in syscall tables

2020-03-21T15:03:23+00:00

Move the ABI prefixes to the __SYSCALL_[abi]() macros. This allows removal of the need to strip the prefix for UML. Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Link: https://lkml.kernel.org/r/20200313195144.164260-13-brgerst@gmail.com

x86/entry/64: Add __SYSCALL_COMMON()

2020-03-21T15:03:22+00:00

Add a __SYSCALL_COMMON() macro to the syscall table, which simplifies syscalltbl.sh. Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Link: https://lkml.kernel.org/r/20200313195144.164260-12-brgerst@gmail.com

x86/entry: Remove syscall qualifier support

2020-03-21T15:03:22+00:00

Syscall qualifier support is no longer needed. Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Reviewed-by: Dominik Brodowski Link: https://lkml.kernel.org/r/20200313195144.164260-11-brgerst@gmail.com

x86/entry/64: Remove ptregs qualifier from syscall table

2020-03-21T15:03:21+00:00

Now that the fast syscall path is removed, the ptregs qualifier is unused. Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Reviewed-by: Dominik Brodowski Link: https://lkml.kernel.org/r/20200313195144.164260-10-brgerst@gmail.com

x86/entry: Move max syscall number calculation to syscallhdr.sh

2020-03-21T15:03:21+00:00

Instead of using an array in asm-offsets to calculate the max syscall number, calculate it when writing out the syscall headers. Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Link: https://lkml.kernel.org/r/20200313195144.164260-9-brgerst@gmail.com

x86/entry/64: Use syscall wrappers for x32_rt_sigreturn

2020-03-21T15:03:20+00:00

Add missing syscall wrapper for x32_rt_sigreturn(). Signed-off-by: Brian Gerst Signed-off-by: Thomas Gleixner Reviewed-by: Dominik Brodowski Reviewed-by: Andy Lutomirski Link: https://lkml.kernel.org/r/20200313195144.164260-6-brgerst@gmail.com