minix/lib/libc/arch/i386
Ben Gras 2d72cbec41 SYSENTER/SYSCALL support
. add cpufeature detection of both
	. use it for both ipc and kernelcall traps, using a register
	  for call number
	. SYSENTER/SYSCALL does not save any context, therefore userland
	  has to save it
	. to accomodate multiple kernel entry/exit types, the entry
	  type is recorded in the process struct. hitherto all types
	  were interrupt (soft int, exception, hard int); now SYSENTER/SYSCALL
	  is new, with the difference that context is not fully restored
	  from proc struct when running the process again. this can't be
	  done as some information is missing.
	. complication: cases in which the kernel has to fully change
	  process context (i.e. sigreturn). in that case the exit type
	  is changed from SYSENTER/SYSEXIT to soft-int (i.e. iret) and
	  context is fully restored from the proc struct. this does mean
	  the PC and SP must change, as the sysenter/sysexit userland code
	  will otherwise try to restore its own context. this is true in the
	  sigreturn case.
	. override all usage by setting libc_ipc=1
2012-09-24 15:53:43 +02:00
..
gdtoa Full switch to clang/ELF. Drop ack. Simplify. 2012-02-14 14:52:02 +01:00
gen Move setjmp and strnlen to common/lib. 2012-06-18 09:20:22 +02:00
net Full switch to clang/ELF. Drop ack. Simplify. 2012-02-14 14:52:02 +01:00
stdlib Full switch to clang/ELF. Drop ack. Simplify. 2012-02-14 14:52:02 +01:00
string Full switch to clang/ELF. Drop ack. Simplify. 2012-02-14 14:52:02 +01:00
sys Full switch to clang/ELF. Drop ack. Simplify. 2012-02-14 14:52:02 +01:00
sys-minix SYSENTER/SYSCALL support 2012-09-24 15:53:43 +02:00
Makefile.inc Full switch to clang/ELF. Drop ack. Simplify. 2012-02-14 14:52:02 +01:00
SYS.h Full switch to clang/ELF. Drop ack. Simplify. 2012-02-14 14:52:02 +01:00