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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/parisc/hpux/gate.S
downloadlinux-stericsson-2.6.12-rc2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
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!
Diffstat (limited to 'arch/parisc/hpux/gate.S')
-rw-r--r--arch/parisc/hpux/gate.S116
1 files changed, 116 insertions, 0 deletions
diff --git a/arch/parisc/hpux/gate.S b/arch/parisc/hpux/gate.S
new file mode 100644
index 000000000000..2680a1c0fa77
--- /dev/null
+++ b/arch/parisc/hpux/gate.S
@@ -0,0 +1,116 @@
+/*
+ *
+ * Linux/PARISC Project (http://www.parisc-linux.org/)
+ *
+ * System call entry code Copyright (c) Matthew Wilcox 1999 <willy@bofh.ai>
+ * Licensed under the GNU GPL.
+ * thanks to Philipp Rumpf, Mike Shaver and various others
+ * sorry about the wall, puffin..
+ */
+
+#include <asm/assembly.h>
+#include <asm/offsets.h>
+#include <asm/unistd.h>
+#include <asm/errno.h>
+
+#ifdef __LP64__
+ .level 2.0w
+#else
+ .level 1.1
+#endif
+ .text
+
+#ifdef __LP64__
+#define FRAME_SIZE 128
+#else
+#define FRAME_SIZE 64
+#endif
+ .import hpux_call_table
+ .import hpux_syscall_exit,code
+ .export hpux_gateway_page
+
+ .align 4096
+hpux_gateway_page:
+ nop
+#ifdef __LP64__
+#warning NEEDS WORK for 64-bit
+#endif
+ ldw -64(%r30), %r29 ;! 8th argument
+ ldw -60(%r30), %r19 ;! 7th argument
+ ldw -56(%r30), %r20 ;! 6th argument
+ ldw -52(%r30), %r21 ;! 5th argument
+ gate .+8, %r0 /* become privileged */
+ mtsp %r0,%sr4 /* get kernel space into sr4 */
+ mtsp %r0,%sr5 /* get kernel space into sr5 */
+ mtsp %r0,%sr6 /* get kernel space into sr6 */
+ mfsp %sr7,%r1 /* save user sr7 */
+ mtsp %r1,%sr3 /* and store it in sr3 */
+
+ mtctl %r30,%cr28
+ mfctl %cr30,%r1
+ xor %r1,%r30,%r30 /* ye olde xor trick */
+ xor %r1,%r30,%r1
+ xor %r1,%r30,%r30
+ ldo TASK_SZ_ALGN+FRAME_SIZE(%r30),%r30 /* set up kernel stack */
+
+ /* N.B.: It is critical that we don't set sr7 to 0 until r30
+ * contains a valid kernel stack pointer. It is also
+ * critical that we don't start using the kernel stack
+ * until after sr7 has been set to 0.
+ */
+
+ mtsp %r0,%sr7 /* get kernel space into sr7 */
+ STREG %r1,TASK_PT_GR30-TASK_SZ_ALGN-FRAME_SIZE(%r30) /* save usp */
+ ldo -TASK_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr in %r1 */
+
+ /* Save some registers for sigcontext and potential task
+ switch (see entry.S for the details of which ones are
+ saved/restored). TASK_PT_PSW is zeroed so we can see whether
+ a process is on a syscall or not. For an interrupt the real
+ PSW value is stored. This is needed for gdb and sys_ptrace. */
+ STREG %r0, TASK_PT_PSW(%r1)
+ STREG %r2, TASK_PT_GR2(%r1) /* preserve rp */
+ STREG %r19, TASK_PT_GR19(%r1) /* 7th argument */
+ STREG %r20, TASK_PT_GR20(%r1) /* 6th argument */
+ STREG %r21, TASK_PT_GR21(%r1) /* 5th argument */
+ STREG %r22, TASK_PT_GR22(%r1) /* syscall # */
+ STREG %r23, TASK_PT_GR23(%r1) /* 4th argument */
+ STREG %r24, TASK_PT_GR24(%r1) /* 3rd argument */
+ STREG %r25, TASK_PT_GR25(%r1) /* 2nd argument */
+ STREG %r26, TASK_PT_GR26(%r1) /* 1st argument */
+ STREG %r27, TASK_PT_GR27(%r1) /* user dp */
+ STREG %r28, TASK_PT_GR28(%r1) /* return value 0 */
+ STREG %r28, TASK_PT_ORIG_R28(%r1) /* return value 0 (saved for signals) */
+ STREG %r29, TASK_PT_GR29(%r1) /* 8th argument */
+ STREG %r31, TASK_PT_GR31(%r1) /* preserve syscall return ptr */
+
+ ldo TASK_PT_FR0(%r1), %r27 /* save fpregs from the kernel */
+ save_fp %r27 /* or potential task switch */
+
+ mfctl %cr11, %r27 /* i.e. SAR */
+ STREG %r27, TASK_PT_SAR(%r1)
+
+ loadgp
+
+ stw %r21, -52(%r30) ;! 5th argument
+ stw %r20, -56(%r30) ;! 6th argument
+ stw %r19, -60(%r30) ;! 7th argument
+ stw %r29, -64(%r30) ;! 8th argument
+
+ ldil L%hpux_call_table, %r21
+ ldo R%hpux_call_table(%r21), %r21
+ comiclr,>>= __NR_HPUX_syscalls, %r22, %r0
+ b,n syscall_nosys
+ ldwx,s %r22(%r21), %r21
+ ldil L%hpux_syscall_exit,%r2
+ be 0(%sr7,%r21)
+ ldo R%hpux_syscall_exit(%r2),%r2
+
+syscall_nosys:
+ ldil L%hpux_syscall_exit,%r1
+ be R%hpux_syscall_exit(%sr7,%r1)
+ ldo -ENOSYS(%r0),%r28
+
+ .align 4096
+ .export end_hpux_gateway_page
+end_hpux_gateway_page: