00df111e7e
Don't bother restoring r28 on syscall restarts; it's clobbered by syscall anyway. Reuse (now unused) ->orig_r28 as "no restarts allowed" flag. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
107 lines
3.6 KiB
ArmAsm
107 lines
3.6 KiB
ArmAsm
/*
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*
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* Linux/PARISC Project (http://www.parisc-linux.org/)
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*
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* System call entry code Copyright (c) Matthew Wilcox 1999 <willy@bofh.ai>
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* Licensed under the GNU GPL.
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* thanks to Philipp Rumpf, Mike Shaver and various others
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* sorry about the wall, puffin..
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*/
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#include <asm/assembly.h>
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#include <asm/asm-offsets.h>
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#include <asm/unistd.h>
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#include <asm/errno.h>
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#include <linux/linkage.h>
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.level LEVEL
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.text
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.import hpux_call_table
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.import hpux_syscall_exit,code
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.align PAGE_SIZE
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ENTRY(hpux_gateway_page)
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nop
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#ifdef CONFIG_64BIT
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#warning NEEDS WORK for 64-bit
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#endif
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ldw -64(%r30), %r29 ;! 8th argument
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ldw -60(%r30), %r19 ;! 7th argument
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ldw -56(%r30), %r20 ;! 6th argument
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ldw -52(%r30), %r21 ;! 5th argument
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gate .+8, %r0 /* become privileged */
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mtsp %r0,%sr4 /* get kernel space into sr4 */
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mtsp %r0,%sr5 /* get kernel space into sr5 */
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mtsp %r0,%sr6 /* get kernel space into sr6 */
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mfsp %sr7,%r1 /* save user sr7 */
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mtsp %r1,%sr3 /* and store it in sr3 */
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mtctl %r30,%cr28
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mfctl %cr30,%r1
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xor %r1,%r30,%r30 /* ye olde xor trick */
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xor %r1,%r30,%r1
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xor %r1,%r30,%r30
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ldo TASK_SZ_ALGN+FRAME_SIZE(%r30),%r30 /* set up kernel stack */
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/* N.B.: It is critical that we don't set sr7 to 0 until r30
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* contains a valid kernel stack pointer. It is also
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* critical that we don't start using the kernel stack
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* until after sr7 has been set to 0.
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*/
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mtsp %r0,%sr7 /* get kernel space into sr7 */
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STREG %r1,TASK_PT_GR30-TASK_SZ_ALGN-FRAME_SIZE(%r30) /* save usp */
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ldo -TASK_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr in %r1 */
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/* Save some registers for sigcontext and potential task
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switch (see entry.S for the details of which ones are
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saved/restored). TASK_PT_PSW is zeroed so we can see whether
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a process is on a syscall or not. For an interrupt the real
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PSW value is stored. This is needed for gdb and sys_ptrace. */
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STREG %r0, TASK_PT_PSW(%r1)
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STREG %r2, TASK_PT_GR2(%r1) /* preserve rp */
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STREG %r19, TASK_PT_GR19(%r1) /* 7th argument */
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STREG %r20, TASK_PT_GR20(%r1) /* 6th argument */
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STREG %r21, TASK_PT_GR21(%r1) /* 5th argument */
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STREG %r22, TASK_PT_GR22(%r1) /* syscall # */
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STREG %r23, TASK_PT_GR23(%r1) /* 4th argument */
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STREG %r24, TASK_PT_GR24(%r1) /* 3rd argument */
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STREG %r25, TASK_PT_GR25(%r1) /* 2nd argument */
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STREG %r26, TASK_PT_GR26(%r1) /* 1st argument */
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STREG %r27, TASK_PT_GR27(%r1) /* user dp */
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STREG %r28, TASK_PT_GR28(%r1) /* return value 0 */
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STREG %r0, TASK_PT_ORIG_R28(%r1) /* don't prohibit restarts */
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STREG %r29, TASK_PT_GR29(%r1) /* 8th argument */
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STREG %r31, TASK_PT_GR31(%r1) /* preserve syscall return ptr */
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ldo TASK_PT_FR0(%r1), %r27 /* save fpregs from the kernel */
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save_fp %r27 /* or potential task switch */
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mfctl %cr11, %r27 /* i.e. SAR */
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STREG %r27, TASK_PT_SAR(%r1)
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loadgp
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stw %r21, -52(%r30) ;! 5th argument
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stw %r20, -56(%r30) ;! 6th argument
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stw %r19, -60(%r30) ;! 7th argument
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stw %r29, -64(%r30) ;! 8th argument
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ldil L%hpux_call_table, %r21
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ldo R%hpux_call_table(%r21), %r21
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comiclr,>>= __NR_HPUX_syscalls, %r22, %r0
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b,n syscall_nosys
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LDREGX %r22(%r21), %r21
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ldil L%hpux_syscall_exit,%r2
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be 0(%sr7,%r21)
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ldo R%hpux_syscall_exit(%r2),%r2
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syscall_nosys:
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ldil L%hpux_syscall_exit,%r1
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be R%hpux_syscall_exit(%sr7,%r1)
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ldo -ENOSYS(%r0),%r28
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ENDPROC(hpux_gateway_page)
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.align PAGE_SIZE
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ENTRY(end_hpux_gateway_page)
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