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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | /* * * 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 4096 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 4096 ENTRY(end_hpux_gateway_page) |