diff options
Diffstat (limited to 'arch/parisc/hpux/gate.S')
| -rw-r--r-- | arch/parisc/hpux/gate.S | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/arch/parisc/hpux/gate.S b/arch/parisc/hpux/gate.S new file mode 100644 index 00000000..38a1c1b8 --- /dev/null +++ b/arch/parisc/hpux/gate.S @@ -0,0 +1,107 @@ +/* + * + * 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/asm-offsets.h> +#include <asm/unistd.h> +#include <asm/errno.h> +#include <linux/linkage.h> + + .level LEVEL + .text + + .import hpux_call_table + .import hpux_syscall_exit,code + + .align PAGE_SIZE +ENTRY(hpux_gateway_page) + nop +#ifdef CONFIG_64BIT +#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 + LDREGX %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 +ENDPROC(hpux_gateway_page) + + .align PAGE_SIZE +ENTRY(end_hpux_gateway_page) |