1/* 2 * 3 * Linux/PARISC Project (http://www.parisc-linux.org/) 4 * 5 * System call entry code Copyright (c) Matthew Wilcox 1999 <willy@bofh.ai> 6 * Licensed under the GNU GPL. 7 * thanks to Philipp Rumpf, Mike Shaver and various others 8 * sorry about the wall, puffin.. 9 */ 10 11#include <asm/assembly.h> 12#include <asm/asm-offsets.h> 13#include <asm/unistd.h> 14#include <asm/errno.h> 15#include <linux/linkage.h> 16 17 .level LEVEL 18 .text 19 20 .import hpux_call_table 21 .import hpux_syscall_exit,code 22 23 .align PAGE_SIZE 24ENTRY(hpux_gateway_page) 25 nop 26#ifdef CONFIG_64BIT 27#warning NEEDS WORK for 64-bit 28#endif 29 ldw -64(%r30), %r29 ;! 8th argument 30 ldw -60(%r30), %r19 ;! 7th argument 31 ldw -56(%r30), %r20 ;! 6th argument 32 ldw -52(%r30), %r21 ;! 5th argument 33 gate .+8, %r0 /* become privileged */ 34 mtsp %r0,%sr4 /* get kernel space into sr4 */ 35 mtsp %r0,%sr5 /* get kernel space into sr5 */ 36 mtsp %r0,%sr6 /* get kernel space into sr6 */ 37 mfsp %sr7,%r1 /* save user sr7 */ 38 mtsp %r1,%sr3 /* and store it in sr3 */ 39 40 mtctl %r30,%cr28 41 mfctl %cr30,%r1 42 xor %r1,%r30,%r30 /* ye olde xor trick */ 43 xor %r1,%r30,%r1 44 xor %r1,%r30,%r30 45 ldo TASK_SZ_ALGN+FRAME_SIZE(%r30),%r30 /* set up kernel stack */ 46 47 /* N.B.: It is critical that we don't set sr7 to 0 until r30 48 * contains a valid kernel stack pointer. It is also 49 * critical that we don't start using the kernel stack 50 * until after sr7 has been set to 0. 51 */ 52 53 mtsp %r0,%sr7 /* get kernel space into sr7 */ 54 STREG %r1,TASK_PT_GR30-TASK_SZ_ALGN-FRAME_SIZE(%r30) /* save usp */ 55 ldo -TASK_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr in %r1 */ 56 57 /* Save some registers for sigcontext and potential task 58 switch (see entry.S for the details of which ones are 59 saved/restored). TASK_PT_PSW is zeroed so we can see whether 60 a process is on a syscall or not. For an interrupt the real 61 PSW value is stored. This is needed for gdb and sys_ptrace. */ 62 STREG %r0, TASK_PT_PSW(%r1) 63 STREG %r2, TASK_PT_GR2(%r1) /* preserve rp */ 64 STREG %r19, TASK_PT_GR19(%r1) /* 7th argument */ 65 STREG %r20, TASK_PT_GR20(%r1) /* 6th argument */ 66 STREG %r21, TASK_PT_GR21(%r1) /* 5th argument */ 67 STREG %r22, TASK_PT_GR22(%r1) /* syscall # */ 68 STREG %r23, TASK_PT_GR23(%r1) /* 4th argument */ 69 STREG %r24, TASK_PT_GR24(%r1) /* 3rd argument */ 70 STREG %r25, TASK_PT_GR25(%r1) /* 2nd argument */ 71 STREG %r26, TASK_PT_GR26(%r1) /* 1st argument */ 72 STREG %r27, TASK_PT_GR27(%r1) /* user dp */ 73 STREG %r28, TASK_PT_GR28(%r1) /* return value 0 */ 74 STREG %r0, TASK_PT_ORIG_R28(%r1) /* don't prohibit restarts */ 75 STREG %r29, TASK_PT_GR29(%r1) /* 8th argument */ 76 STREG %r31, TASK_PT_GR31(%r1) /* preserve syscall return ptr */ 77 78 ldo TASK_PT_FR0(%r1), %r27 /* save fpregs from the kernel */ 79 save_fp %r27 /* or potential task switch */ 80 81 mfctl %cr11, %r27 /* i.e. SAR */ 82 STREG %r27, TASK_PT_SAR(%r1) 83 84 loadgp 85 86 stw %r21, -52(%r30) ;! 5th argument 87 stw %r20, -56(%r30) ;! 6th argument 88 stw %r19, -60(%r30) ;! 7th argument 89 stw %r29, -64(%r30) ;! 8th argument 90 91 ldil L%hpux_call_table, %r21 92 ldo R%hpux_call_table(%r21), %r21 93 comiclr,>>= __NR_HPUX_syscalls, %r22, %r0 94 b,n syscall_nosys 95 LDREGX %r22(%r21), %r21 96 ldil L%hpux_syscall_exit,%r2 97 be 0(%sr7,%r21) 98 ldo R%hpux_syscall_exit(%r2),%r2 99 100syscall_nosys: 101 ldil L%hpux_syscall_exit,%r1 102 be R%hpux_syscall_exit(%sr7,%r1) 103 ldo -ENOSYS(%r0),%r28 104ENDPROC(hpux_gateway_page) 105 106 .align PAGE_SIZE 107ENTRY(end_hpux_gateway_page) 108