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/*
* 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 (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright 2019 Joyent, Inc.
*/
/*
* This is an assembly file that gets #include-ed into the brand-specific
* assembly files (e.g. sn1_brand_asm.s) for Solaris-derived brands.
* We can't make these into functions since in the trap context there's
* no easy place to save the extra parameters that would be required, so
* each brand module needs its own copy of this code. We #include this and
* use brand-specific #defines to replace the XXX_brand_... definitions.
*/
#include <sys/asm_linkage.h>
#include <sys/privregs.h>
#include <sys/segments.h>
#include "assym.h"
#include "brand_asm.h"
#ifdef _ASM /* The remainder of this file is only for assembly files */
/*
* syscall handler for 32-bit user processes:
* See "64-BIT INTERPOSITION STACK" in brand_asm.h.
* To 'return' to our user-space handler, we just need to place its address
* into %rcx. The original return address is passed back in SYSCALL_REG.
*/
ENTRY(XXX_brand_syscall32_callback)
CALLBACK_PROLOGUE(XXX_emulation_table, SPD_HANDLER, SYSCALL_REG,
SCR_REG, SCR_REGB);
CALC_TABLE_ADDR(SCR_REG, SPD_HANDLER);
mov %rcx, SYSCALL_REG; /* save orig return addr in syscall_reg */
mov SCR_REG, %rcx; /* place new return addr in %rcx */
mov %gs:CPU_RTMP_R15, SCR_REG; /* restore scratch register */
call x86_md_clear /* Flush micro-arch state */
mov V_SSP(SP_REG), SP_REG /* restore user stack pointer */
jmp nopop_sys_syscall32_swapgs_sysretl
9:
retq
SET_SIZE(XXX_brand_syscall32_callback)
/*
* syscall handler for 64-bit user processes:
* See "64-BIT INTERPOSITION STACK" in brand_asm.h.
* To 'return' to our user-space handler, we just need to place its address
* into %rcx. The original return address is passed back in SYSCALL_REG.
*/
ENTRY(XXX_brand_syscall_callback)
CALLBACK_PROLOGUE(XXX_emulation_table, SPD_HANDLER, SYSCALL_REG,
SCR_REG, SCR_REGB);
CALC_TABLE_ADDR(SCR_REG, SPD_HANDLER);
mov %rcx, SYSCALL_REG; /* save orig return addr in syscall_reg */
mov SCR_REG, %rcx; /* place new return addr in %rcx */
mov %gs:CPU_RTMP_R15, SCR_REG; /* restore scratch register */
call x86_md_clear /* Flush micro-arch state */
mov V_SSP(SP_REG), SP_REG /* restore user stack pointer */
jmp nopop_sys_syscall_swapgs_sysretq
9:
retq
SET_SIZE(XXX_brand_syscall_callback)
/*
* See "64-BIT INTERPOSITION STACK" in brand_asm.h.
* To 'return' to our user-space handler, we just need to place its address
* into %rdx. The original return address is passed back in SYSCALL_REG.
*/
ENTRY(XXX_brand_sysenter_callback)
CALLBACK_PROLOGUE(XXX_emulation_table, SPD_HANDLER, SYSCALL_REG,
SCR_REG, SCR_REGB);
CALC_TABLE_ADDR(SCR_REG, SPD_HANDLER);
mov %rdx, SYSCALL_REG; /* save orig return addr in syscall_reg */
mov SCR_REG, %rdx; /* place new return addr in %rdx */
mov %gs:CPU_RTMP_R15, SCR_REG; /* restore scratch register */
mov V_SSP(SP_REG), SP_REG /* restore user stack pointer */
jmp sys_sysenter_swapgs_sysexit
9:
ret
SET_SIZE(XXX_brand_sysenter_callback)
/*
* To 'return' to our user-space handler we need to update the user's %eip
* pointer in the saved interrupt state on the stack. The interrupt state was
* pushed onto our stack automatically when the interrupt occured; see the
* comments above. The original return address is passed back in SYSCALL_REG.
* See "64-BIT INTERPOSITION STACK" and "64-BIT INT STACK" in brand_asm.h.
*/
ENTRY(XXX_brand_int91_callback)
CALLBACK_PROLOGUE(XXX_emulation_table, SPD_HANDLER, SYSCALL_REG,
SCR_REG, SCR_REGB);
CALC_TABLE_ADDR(SCR_REG, SPD_HANDLER); /* new ret addr is in scratch */
mov SCR_REG, SYSCALL_REG; /* place new ret addr in syscallreg */
mov %gs:CPU_RTMP_R15, SCR_REG; /* restore scratch register */
mov V_SSP(SP_REG), SP_REG; /* restore intr stack pointer */
/*CSTYLED*/
xchg (SP_REG), SYSCALL_REG /* swap new and orig. return addrs */
jmp sys_sysint_swapgs_iret
9:
retq
SET_SIZE(XXX_brand_int91_callback)
#endif /* _ASM */
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