sn1_handler.s revision 9acbbeaf2a1ffe5c14b244867d427714fab43c5c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/asm_linkage.h>
#include <sn1_brand.h>
#define RVAL2_FLAG 0x100
#if defined(lint)
void
sn1_handler(void)
{
}
#else /* lint */
/*
* %rax - syscall number
* stack contains return address
*/
ENTRY_NP(sn1_handler)
pushq %rbp
movq %rsp, %rbp
/*
* Look up the system call's entry in the sysent table below
*/
pushq %rdx
movq sn1_sysent_table@GOTPCREL(%rip), %rdx /* %rdx = sysent_table */
shlq $4, %rax /* each entry is 16 bytes */
addq %rdx, %rax /* %rax = sysent entry address */
movq 8(%rax), %rdx /* get NARGS */
testq $RVAL2_FLAG, %rdx /* does syscall have 2 return vals? */
popq %rdx
jz 1f
/*
* Two return syscall. We rely on none of these having either rval
* be larger than 32 bits, and stick both into a single 64-bit
* register. If that changes, we'll have to come up with a
* different scheme.
*/
call *(%rax)
movq %rax, %rdx /* copy upper 32-bit rval into %rdx */
shrq $32, %rdx /* move it to lower 32 bits */
movl %eax, %eax
jmp 2f
1:
call *(%rax) /* call per-syscall handler */
2:
/*
* If %rax >= 0, it means the call completed successfully and %rax
* is the proper return value. Otherwise, %rax contains -errno.
* In the event of an error, we need to set the carry flag (which
* is the kernel's indication of failure to libc) and set %rax to
* the positive errno.
*/
cmpq $0, %rax
jge done
negq %rax
cmc
done:
movq %rbp, %rsp
popq %rbp
ret /* return to instr after syscall */
SET_SIZE(sn1_handler)
.section .data ,"aw"
.globl sn1_sysent_table
.align 8
#define NOSYS \
.quad sn1_unimpl; \
.quad 0
#define EMULATE(name, args) \
.globl name; \
.quad name; \
.quad args
sn1_sysent_table:
.type sn1_sysent_table, @object
.size sn1_sysent_table, 4096
.align 8
NOSYS /* 0 */
NOSYS /* 1 */
NOSYS /* 2 */
NOSYS /* 3 */
NOSYS /* 4 */
NOSYS /* 5 */
NOSYS /* 6 */
NOSYS /* 7 */
NOSYS /* 8 */
NOSYS /* 9 */
NOSYS /* 10 */
NOSYS /* 11 */
NOSYS /* 12 */
NOSYS /* 13 */
NOSYS /* 14 */
NOSYS /* 15 */
NOSYS /* 16 */
NOSYS /* 17 */
NOSYS /* 18 */
NOSYS /* 19 */
NOSYS /* 20 */
NOSYS /* 21 */
NOSYS /* 22 */
NOSYS /* 23 */
NOSYS /* 24 */
NOSYS /* 25 */
NOSYS /* 26 */
NOSYS /* 27 */
NOSYS /* 28 */
NOSYS /* 29 */
NOSYS /* 30 */
NOSYS /* 31 */
NOSYS /* 32 */
NOSYS /* 33 */
NOSYS /* 34 */
NOSYS /* 35 */
NOSYS /* 36 */
NOSYS /* 37 */
NOSYS /* 38 */
NOSYS /* 39 */
NOSYS /* 40 */
NOSYS /* 41 */
NOSYS /* 42 */
NOSYS /* 43 */
NOSYS /* 44 */
NOSYS /* 45 */
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NOSYS /* 47 */
NOSYS /* 48 */
NOSYS /* 49 */
NOSYS /* 50 */
NOSYS /* 51 */
NOSYS /* 52 */
NOSYS /* 53 */
NOSYS /* 54 */
NOSYS /* 55 */
NOSYS /* 56 */
NOSYS /* 57 */
NOSYS /* 58 */
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NOSYS /* 60 */
NOSYS /* 61 */
NOSYS /* 62 */
NOSYS /* 63 */
NOSYS /* 64 */
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NOSYS /* 66 */
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NOSYS /* 68 */
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NOSYS /* 70 */
NOSYS /* 71 */
NOSYS /* 72 */
NOSYS /* 73 */
NOSYS /* 74 */
NOSYS /* 75 */
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NOSYS /* 77 */
NOSYS /* 78 */
NOSYS /* 79 */
NOSYS /* 80 */
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NOSYS /* 83 */
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NOSYS /* 85 */
NOSYS /* 86 */
NOSYS /* 87 */
NOSYS /* 88 */
NOSYS /* 89 */
NOSYS /* 90 */
NOSYS /* 91 */
NOSYS /* 92 */
NOSYS /* 93 */
NOSYS /* 94 */
NOSYS /* 95 */
NOSYS /* 96 */
NOSYS /* 97 */
NOSYS /* 98 */
NOSYS /* 99 */
NOSYS /* 100 */
NOSYS /* 101 */
NOSYS /* 102 */
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NOSYS /* 104 */
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NOSYS /* 110 */
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NOSYS /* 119 */
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NOSYS /* 127 */
NOSYS /* 128 */
NOSYS /* 129 */
NOSYS /* 130 */
NOSYS /* 131 */
NOSYS /* 132 */
NOSYS /* 133 */
NOSYS /* 134 */
EMULATE(sn1_uname, 1) /* 135 */
NOSYS /* 136 */
NOSYS /* 137 */
NOSYS /* 138 */
NOSYS /* 139 */
NOSYS /* 140 */
NOSYS /* 141 */
NOSYS /* 142 */
EMULATE(sn1_fork1, RVAL2_FLAG | 0) /* 143 */
NOSYS /* 144 */
NOSYS /* 145 */
NOSYS /* 146 */
NOSYS /* 147 */
NOSYS /* 148 */
NOSYS /* 149 */
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NOSYS /* 193 */
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NOSYS /* 245 */
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NOSYS /* 247 */
NOSYS /* 248 */
NOSYS /* 249 */
NOSYS /* 250 */
NOSYS /* 251 */
NOSYS /* 252 */
NOSYS /* 253 */
NOSYS /* 254 */
NOSYS /* 255 */
#endif /* lint */