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SYSENTER/SYSCALL support

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. 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
This commit is contained in:
Ben Gras
2012-06-10 17:50:17 +00:00
parent 629829e69c
commit 2d72cbec41
38 changed files with 643 additions and 79 deletions
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26
lib/libc/arch/i386/sys-minix/_ipc.S
View File

@@ -9,40 +9,40 @@
/* IPC assembly routines * */
/**========================================================================* */
/* all message passing routines save ebx, but destroy eax and ecx. */
ENTRY(_send)
ENTRY(_send_orig)
push %ebp
movl %esp, %ebp
push %ebx
movl SRC_DST(%ebp), %eax /* eax = dest-src */
movl MESSAGE(%ebp), %ebx /* ebx = message pointer */
movl $SEND, %ecx /* _send(dest, ptr) */
int $IPCVEC /* trap to the kernel */
int $IPCVEC_ORIG /* trap to the kernel */
pop %ebx
pop %ebp
ret
ENTRY(_receive)
ENTRY(_receive_orig)
push %ebp
movl %esp, %ebp
push %ebx
movl SRC_DST(%ebp), %eax /* eax = dest-src */
movl MESSAGE(%ebp), %ebx /* ebx = message pointer */
movl $RECEIVE, %ecx /* _receive(src, ptr) */
int $IPCVEC /* trap to the kernel */
int $IPCVEC_ORIG /* trap to the kernel */
movl STATUS(%ebp), %ecx /* ecx = status pointer */
movl %ebx, (%ecx)
pop %ebx
pop %ebp
ret
ENTRY(_sendrec)
ENTRY(_sendrec_orig)
push %ebp
movl %esp, %ebp
push %ebx
movl SRC_DST(%ebp), %eax /* eax = dest-src */
movl MESSAGE(%ebp), %ebx /* ebx = message pointer */
movl $SENDREC, %ecx /* _sendrec(srcdest, ptr) */
int $IPCVEC /* trap to the kernel */
int $IPCVEC_ORIG /* trap to the kernel */
pop %ebx
pop %ebp
ret
@@ -54,38 +54,38 @@ ENTRY(_minix_kernel_info_struct)
movl $0, %eax
movl $0, %ebx
movl $MINIX_KERNINFO, %ecx
int $IPCVEC /* trap to the kernel */
int $IPCVEC_ORIG /* trap to the kernel */
movl 8(%ebp), %ecx /* ecx = return struct ptr */
movl %ebx, (%ecx)
pop %ebx
pop %ebp
ret
ENTRY(_notify)
ENTRY(_notify_orig)
push %ebp
movl %esp, %ebp
push %ebx
movl SRC_DST(%ebp), %eax /* eax = destination */
movl $NOTIFY, %ecx /* _notify(srcdst) */
int $IPCVEC /* trap to the kernel */
int $IPCVEC_ORIG /* trap to the kernel */
pop %ebx
pop %ebp
ret
ENTRY(_sendnb)
ENTRY(_sendnb_orig)
push %ebp
movl %esp, %ebp
push %ebx
movl SRC_DST(%ebp), %eax /* eax = dest-src */
movl MESSAGE(%ebp), %ebx /* ebx = message pointer */
movl $SENDNB, %ecx /* _sendnb(dest, ptr) */
int $IPCVEC /* trap to the kernel */
int $IPCVEC_ORIG /* trap to the kernel */
pop %ebx
pop %ebp
ret
ENTRY(_do_kernel_call)
ENTRY(_do_kernel_call_orig)
/* pass the message pointer to kernel in the %eax register */
movl 4(%esp), %eax
int $KERVEC
int $KERVEC_ORIG
ret

2
lib/libc/arch/i386/sys-minix/_senda.S
View File

@@ -4,7 +4,7 @@
MSGTAB = 8 /* message table */
TABCOUNT = 12 /* number of entries in message table */
ENTRY(_senda)
ENTRY(_senda_orig)
push %ebp
movl %esp, %ebp
push %ebx