1. 06 5月, 2006 1 次提交
  2. 30 4月, 2006 1 次提交
  3. 15 4月, 2006 1 次提交
  4. 30 3月, 2006 1 次提交
  5. 17 2月, 2006 1 次提交
  6. 15 1月, 2006 2 次提交
    • N
      [ARM] 3110/5: old ABI compat: multi-ABI syscall entry support · dd35afc2
      Nicolas Pitre 提交于
      Patch from Nicolas Pitre
      
      This patch adds the required code to support both user space ABIs at
      the same time. A second syscall table is created to include legacy ABI
      syscalls that need an ABI compat wrapper.
      Signed-off-by: NNicolas Pitre <nico@cam.org>
      Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      dd35afc2
    • N
      [ARM] 3105/4: ARM EABI: new syscall entry convention · 3f2829a3
      Nicolas Pitre 提交于
      Patch from Nicolas Pitre
      
      For a while we wanted to change the way syscalls were called on ARM.
      Instead of encoding the syscall number in the swi instruction which
      requires reading back the instruction from memory to extract that number
      and polluting the data cache, it was decided that simply storing the
      syscall number into r7 would be more efficient. Since this represents
      an ABI change then making that change at the same time as EABI support
      is the right thing to do.
      
      It is now expected that EABI user space binaries put the syscall number
      into r7 and use "swi 0" to call the kernel. Syscall register argument
      are also expected to have "EABI arrangement" i.e. 64-bit arguments
      should be put in a pair of registers from an even register number.
      
      Example with long ftruncate64(unsigned int fd, loff_t length):
      
      	legacy ABI:
      	- put fd into r0
      	- put length into r1-r2
      	- use "swi #(0x900000 + 194)" to call the kernel
      
      	new ARM EABI:
      	- put fd into r0
      	- put length into r2-r3 (skipping over r1)
      	- put 194 into r7
      	- use "swi 0" to call the kernel
      
      Note that it is important to use 0 for the swi argument as backward
      compatibility with legacy ABI user space relies on this.
      The syscall macros in asm-arm/unistd.h were also updated to support
      both ABIs and implement the right call method automatically.
      Signed-off-by: NNicolas Pitre <nico@cam.org>
      Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      3f2829a3
  7. 31 10月, 2005 1 次提交
  8. 09 9月, 2005 1 次提交
  9. 01 9月, 2005 1 次提交
    • N
      [ARM] 2865/2: fix fadvise64_64 syscall argument passing · 68d9102f
      Nicolas Pitre 提交于
      Patch from Nicolas Pitre
      
      The prototype for sys_fadvise64_64() is:
          long sys_fadvise64_64(int fd, loff_t offset, loff_t len, int advice)
      The argument list is therefore as follows on legacy ABI:
      	fd: type int (r0)
      	offset: type long long (r1-r2)
      	len: type long long (r3-sp[0])
      	advice: type int (sp[4])
      With EABI this becomes:
      	fd: type int (r0)
      	offset: type long long (r2-r3)
      	len: type long long (sp[0]-sp[4])
      	advice: type int (sp[8])
      Not only do we have ABI differences here, but the EABI version requires
      one additional word on the syscall stack.
      To avoid the ABI mismatch and the extra stack space required with EABI
      this syscall is now defined with a different argument ordering
      on ARM as follows:
          long sys_arm_fadvise64_64(int fd, int advice, loff_t offset, loff_t len)
      This gives us the following ABI independent argument distribution:
      	fd: type int (r0)
      	advice: type int (r1)
      	offset: type long long (r2-r3)
      	len: type long long (sp[0]-sp[4])
      Now, since the syscall entry code takes care of 5 registers only by
      default including the store of r4 to the stack, we need a wrapper to
      store r5 to the stack as well.  Because that wrapper was missing and was
      always required this means that sys_fadvise64_64 never worked on ARM and
      therefore we can safely reuse its syscall number for our new
      sys_arm_fadvise64_64 interface.
      Signed-off-by: NNicolas Pitre <nico@cam.org>
      Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      68d9102f
  10. 30 8月, 2005 1 次提交
  11. 15 8月, 2005 1 次提交
  12. 30 4月, 2005 1 次提交
    • N
      [PATCH] ARM: 2651/3: kernel helpers for NPTL support · 2d2669b6
      Nicolas Pitre 提交于
      Patch from Nicolas Pitre
      
      This patch entirely reworks the kernel assistance for NPTL on ARM.
      In particular this provides an efficient way to retrieve the TLS
      value and perform atomic operations without any instruction emulation
      nor special system call.  This even allows for pre ARMv6 binaries to
      be forward compatible with SMP systems without any penalty.
      The problematic and performance critical operations are performed
      through segment of kernel provided user code reachable from user space
      at a fixed address in kernel memory.  Those fixed entry points are
      within the vector page so we basically get it for free as no extra
      memory page is required and nothing else may be mapped at that
      location anyway.
      This is different from (but doesn't preclude) a full blown VDSO
      implementation, however a VDSO would prevent some assembly tricks with
      constants that allows for efficient branching to those code segments.
      And since those code segments only use a few cycles before returning to
      user code, the overhead of a VDSO far call would add a significant
      overhead to such minimalistic operations.
      The ARM_NR_set_tls syscall also changed number.  This is done for two
      reasons:
      1) this patch changes the way the TLS value was previously meant to be
         retrieved, therefore we ensure whatever library using the old way
         gets fixed (they only exist in private tree at the moment since the
         NPTL work is still progressing).
      2) the previous number was allocated in a range causing an undefined
         instruction trap on kernels not supporting that syscall and it was
         determined that allocating it in a range returning -ENOSYS would be
         much nicer for libraries trying to determine if the feature is
         present or not.
      
      Signed-off-by: Nicolas Pitre
      Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      2d2669b6
  13. 17 4月, 2005 1 次提交
    • L
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds 提交于
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      
      Let it rip!
      1da177e4