BMC/Intel-BMC/linux.git/arch/mips/kernel/scall32-o32.S, branch dev

MIPS: O32: Do not handle require 32 bytes from the stack to be readable.

2015-07-08T03:03:30+00:00

Commit 46e12c07b3b9603c60fc1d421ff18618241cb081 (MIPS: O32 / 32-bit: Always copy 4 stack arguments.) change the O32 syscall handler to always load four arguments from the userspace stack even for syscalls that require fewer or no arguments to be copied. This removes a large table from kernel space and need to maintain it. It appeared that it was ok the implementation chosen requires 16 bytes of readable stack space above the user stack pointer. Turned out a few threading implementations munmap the user stack before the thread exits resulting in errors due to the unreadable stack. We now treat any failed load as a if the loaded value was zero and let the actual syscall deal with the situation. Signed-off-by: Ralf Baechle

MIPS: Fix restart of indirect syscalls

2015-01-15T23:35:45+00:00

When 32-bit MIPS userspace invokes a syscall indirectly via syscall(number, arg1, ..., arg7), the kernel looks up the actual syscall based on the given number, shifts the other arguments to the left, and jumps to the syscall. If the syscall is interrupted by a signal and indicates it needs to be restarted by the kernel (by returning ERESTARTNOINTR for example), the syscall must be called directly, since the number is no longer the first argument, and the other arguments are now staged for a direct call. Before shifting the arguments, store the syscall number in pt_regs->regs[2]. This gets copied temporarily into pt_regs->regs[0] after the syscall returns. If the syscall needs to be restarted, handle_signal()/do_signal() copies the number back to pt_regs->reg[2], which ends up in $v0 once control returns to userspace. Signed-off-by: Ed Swierk Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/8929/ Signed-off-by: Ralf Baechle

MIPS: Wire up execveat(2).

2015-01-13T14:53:09+00:00

Signed-off-by: Ralf Baechle

MIPS: Wire up bpf syscall.

2014-10-27T02:37:42+00:00

Signed-off-by: Ralf Baechle

MIPS: Wire up new syscalls getrandom and memfd_create.

2014-08-26T01:03:40+00:00

Signed-off-by: Ralf Baechle

Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus

2014-08-07T15:47:00+00:00

Pull MIPS updates from Ralf Baechle: "This is the main pull request for 3.17. It contains: - misc Cavium Octeon, BCM47xx, BCM63xx and Alchemy updates - MIPS ptrace updates and cleanups - various fixes that will also go to -stable - a number of cleanups and small non-critical fixes. - NUMA support for the Loongson 3. - more support for MSA - support for MAAR - various FP enhancements and fixes" * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (139 commits) MIPS: jz4740: remove unnecessary null test before debugfs_remove MIPS: Octeon: remove unnecessary null test before debugfs_remove_recursive MIPS: ZBOOT: implement stack protector in compressed boot phase MIPS: mipsreg: remove duplicate MIPS_CONF4_FTLBSETS_SHIFT MIPS: Bonito64: remove a duplicate define MIPS: Malta: initialise MAARs MIPS: Initialise MAARs MIPS: detect presence of MAARs MIPS: define MAAR register accessors & bits MIPS: mark MSA experimental MIPS: Don't build MSA support unless it can be used MIPS: consistently clear MSA flags when starting & copying threads MIPS: 16 byte align MSA vector context MIPS: disable preemption whilst initialising MSA MIPS: ensure MSA gets disabled during boot MIPS: fix read_msa_* & write_msa_* functions on non-MSA toolchains MIPS: fix MSA context for tasks which don't use FP first MIPS: init upper 64b of vector registers when MSA is first used MIPS: save/disable MSA in lose_fpu MIPS: preserve scalar FP CSR when switching vector context ...

MIPS: O32/32-bit: Remove outdated comment

2014-08-01T22:06:37+00:00

A comment in the O32/32-bit system call code is incorrect since commit 46e12c07b3b9 ("MIPS: O32 / 32-bit: Always copy 4 stack arguments."). Remove it. Signed-off-by: Alex Smith Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/7455/ Signed-off-by: Ralf Baechle

MIPS: Add numa api support

2014-07-30T19:46:41+00:00

Enable sys_mbind()/sys_get_mempolicy()/sys_set_mempolicy() for O32, N32, and N64 ABIs. By the way, O32/N32 should use the compat version of sys_migrate_pages()/sys_move_pages(), so fix that. Signed-off-by: Huacai Chen Cc: John Crispin Cc: Steven J. Hill Cc: Aurelien Jarno Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang Cc: Zhangjin Wu Patchwork: https://patchwork.linux-mips.org/patch/7186/ Signed-off-by: Ralf Baechle

MIPS: add seccomp syscall

2014-07-18T19:13:38+00:00

Wires up the new seccomp syscall. Signed-off-by: Kees Cook Reviewed-by: Oleg Nesterov

MIPS: Wire up renameat2 syscall.

2014-05-13T15:57:33+00:00

Signed-off-by: Ralf Baechle