| /* |
| * |
| * 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) |
