From 16dd07bc6404c8da0bdfeb7a5cde4e4a63991c00 Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Sun, 6 May 2007 14:51:48 -0700 Subject: uml: more page fault path trimming More trimming of the page fault path. Permissions are passed around in a single int rather than one bit per int. The permission values are copied from libc so that they can be passed to mmap and mprotect without any further conversion. The register sets used by do_syscall_stub and copy_context_skas0 are initialized once, at boot time, rather than once per call. wait_stub_done checks whether it is getting the signals it expects by comparing the wait status to a mask containing bits for the signals of interest rather than comparing individually to the signal numbers. It also has one check for a wait failure instead of two. The caller is expected to do the initial continue of the stub. This gets rid of an argument and some logic. The fname argument is gone, as that can be had from a stack trace. user_signal() is collapsed into userspace() as it is basically one or two lines of code afterwards. The physical memory remapping stuff is gone, as it is unused. flush_tlb_page is inlined. Signed-off-by: Jeff Dike Cc: Paolo 'Blaisorblade' Giarrusso Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/include/os.h | 6 ++---- arch/um/include/tlb.h | 8 ++------ 2 files changed, 4 insertions(+), 10 deletions(-) (limited to 'arch/um/include') diff --git a/arch/um/include/os.h b/arch/um/include/os.h index e11bdcd8afc2..688d181b5f8a 100644 --- a/arch/um/include/os.h +++ b/arch/um/include/os.h @@ -300,13 +300,12 @@ extern long syscall_stub_data(struct mm_id * mm_idp, unsigned long *data, int data_count, void **addr, void **stub_addr); extern int map(struct mm_id * mm_idp, unsigned long virt, - unsigned long len, int r, int w, int x, int phys_fd, + unsigned long len, int prot, int phys_fd, unsigned long long offset, int done, void **data); extern int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len, int done, void **data); extern int protect(struct mm_id * mm_idp, unsigned long addr, - unsigned long len, int r, int w, int x, int done, - void **data); + unsigned long len, unsigned int prot, int done, void **data); /* skas/process.c */ extern int is_skas_winch(int pid, int fd, void *data); @@ -342,7 +341,6 @@ extern void maybe_sigio_broken(int fd, int read); /* skas/trap */ extern void sig_handler_common_skas(int sig, void *sc_ptr); -extern void user_signal(int sig, union uml_pt_regs *regs, int pid); /* sys-x86_64/prctl.c */ extern int os_arch_prctl(int pid, int code, unsigned long *addr); diff --git a/arch/um/include/tlb.h b/arch/um/include/tlb.h index 8efc1e0f1b84..bcd1a4afb842 100644 --- a/arch/um/include/tlb.h +++ b/arch/um/include/tlb.h @@ -14,9 +14,7 @@ struct host_vm_op { struct { unsigned long addr; unsigned long len; - unsigned int r:1; - unsigned int w:1; - unsigned int x:1; + unsigned int prot; int fd; __u64 offset; } mmap; @@ -27,9 +25,7 @@ struct host_vm_op { struct { unsigned long addr; unsigned long len; - unsigned int r:1; - unsigned int w:1; - unsigned int x:1; + unsigned int prot; } mprotect; } u; }; -- cgit v1.2.2