497 lines
13 KiB
ArmAsm
497 lines
13 KiB
ArmAsm
/*
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* Compatibility mode system call entry point for x86-64.
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*
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* Copyright 2000-2002 Andi Kleen, SuSE Labs.
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*/
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#include <asm/dwarf2.h>
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#include <asm/calling.h>
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#include <asm/asm-offsets.h>
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#include <asm/current.h>
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#include <asm/errno.h>
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#include <asm/ia32_unistd.h>
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#include <asm/thread_info.h>
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#include <asm/segment.h>
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#include <asm/irqflags.h>
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#include <asm/asm.h>
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#include <asm/smap.h>
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#include <linux/linkage.h>
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#include <linux/err.h>
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/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */
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#include <linux/elf-em.h>
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#define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE)
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#define __AUDIT_ARCH_LE 0x40000000
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#ifndef CONFIG_AUDITSYSCALL
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#define sysexit_audit ia32_ret_from_sys_call
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#define sysretl_audit ia32_ret_from_sys_call
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#endif
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.section .entry.text, "ax"
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.macro IA32_ARG_FIXUP noebp=0
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movl %edi,%r8d
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.if \noebp
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.else
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movl %ebp,%r9d
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.endif
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xchg %ecx,%esi
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movl %ebx,%edi
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movl %edx,%edx /* zero extension */
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.endm
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/* clobbers %eax */
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.macro CLEAR_RREGS offset=0, _r9=rax
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xorl %eax,%eax
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movq %rax,\offset+R11(%rsp)
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movq %rax,\offset+R10(%rsp)
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movq %\_r9,\offset+R9(%rsp)
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movq %rax,\offset+R8(%rsp)
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.endm
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/*
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* Reload arg registers from stack in case ptrace changed them.
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* We don't reload %eax because syscall_trace_enter() returned
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* the %rax value we should see. Instead, we just truncate that
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* value to 32 bits again as we did on entry from user mode.
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* If it's a new value set by user_regset during entry tracing,
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* this matches the normal truncation of the user-mode value.
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* If it's -1 to make us punt the syscall, then (u32)-1 is still
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* an appropriately invalid value.
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*/
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.macro LOAD_ARGS32 offset, _r9=0
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.if \_r9
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movl \offset+16(%rsp),%r9d
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.endif
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movl \offset+40(%rsp),%ecx
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movl \offset+48(%rsp),%edx
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movl \offset+56(%rsp),%esi
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movl \offset+64(%rsp),%edi
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movl %eax,%eax /* zero extension */
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.endm
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.macro CFI_STARTPROC32 simple
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CFI_STARTPROC \simple
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CFI_UNDEFINED r8
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CFI_UNDEFINED r9
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CFI_UNDEFINED r10
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CFI_UNDEFINED r11
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CFI_UNDEFINED r12
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CFI_UNDEFINED r13
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CFI_UNDEFINED r14
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CFI_UNDEFINED r15
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.endm
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#ifdef CONFIG_PARAVIRT
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ENTRY(native_usergs_sysret32)
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swapgs
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sysretl
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ENDPROC(native_usergs_sysret32)
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ENTRY(native_irq_enable_sysexit)
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swapgs
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sti
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sysexit
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ENDPROC(native_irq_enable_sysexit)
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#endif
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/*
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* 32bit SYSENTER instruction entry.
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*
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* Arguments:
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* %eax System call number.
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* %ebx Arg1
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* %ecx Arg2
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* %edx Arg3
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* %esi Arg4
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* %edi Arg5
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* %ebp user stack
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* 0(%ebp) Arg6
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*
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* Interrupts off.
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*
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* This is purely a fast path. For anything complicated we use the int 0x80
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* path below. Set up a complete hardware stack frame to share code
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* with the int 0x80 path.
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*/
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ENTRY(ia32_sysenter_target)
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CFI_STARTPROC32 simple
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CFI_SIGNAL_FRAME
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CFI_DEF_CFA rsp,0
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CFI_REGISTER rsp,rbp
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SWAPGS_UNSAFE_STACK
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movq PER_CPU_VAR(kernel_stack), %rsp
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addq $(KERNEL_STACK_OFFSET),%rsp
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/*
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* No need to follow this irqs on/off section: the syscall
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* disabled irqs, here we enable it straight after entry:
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*/
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ENABLE_INTERRUPTS(CLBR_NONE)
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movl %ebp,%ebp /* zero extension */
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pushq_cfi $__USER32_DS
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/*CFI_REL_OFFSET ss,0*/
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pushq_cfi %rbp
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CFI_REL_OFFSET rsp,0
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pushfq_cfi
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/*CFI_REL_OFFSET rflags,0*/
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movl TI_sysenter_return+THREAD_INFO(%rsp,3*8-KERNEL_STACK_OFFSET),%r10d
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CFI_REGISTER rip,r10
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pushq_cfi $__USER32_CS
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/*CFI_REL_OFFSET cs,0*/
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movl %eax, %eax
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pushq_cfi %r10
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CFI_REL_OFFSET rip,0
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pushq_cfi %rax
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cld
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SAVE_ARGS 0,1,0
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/* no need to do an access_ok check here because rbp has been
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32bit zero extended */
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ASM_STAC
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1: movl (%rbp),%ebp
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_ASM_EXTABLE(1b,ia32_badarg)
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ASM_CLAC
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orl $TS_COMPAT,TI_status+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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CFI_REMEMBER_STATE
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jnz sysenter_tracesys
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cmpq $(IA32_NR_syscalls-1),%rax
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ja ia32_badsys
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sysenter_do_call:
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IA32_ARG_FIXUP
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sysenter_dispatch:
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call *ia32_sys_call_table(,%rax,8)
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movq %rax,RAX-ARGOFFSET(%rsp)
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DISABLE_INTERRUPTS(CLBR_NONE)
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TRACE_IRQS_OFF
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testl $_TIF_ALLWORK_MASK,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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jnz sysexit_audit
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sysexit_from_sys_call:
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andl $~TS_COMPAT,TI_status+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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/* clear IF, that popfq doesn't enable interrupts early */
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andl $~0x200,EFLAGS-R11(%rsp)
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movl RIP-R11(%rsp),%edx /* User %eip */
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CFI_REGISTER rip,rdx
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RESTORE_ARGS 0,24,0,0,0,0
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xorq %r8,%r8
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xorq %r9,%r9
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xorq %r10,%r10
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xorq %r11,%r11
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popfq_cfi
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/*CFI_RESTORE rflags*/
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popq_cfi %rcx /* User %esp */
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CFI_REGISTER rsp,rcx
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TRACE_IRQS_ON
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ENABLE_INTERRUPTS_SYSEXIT32
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#ifdef CONFIG_AUDITSYSCALL
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.macro auditsys_entry_common
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movl %esi,%r9d /* 6th arg: 4th syscall arg */
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movl %edx,%r8d /* 5th arg: 3rd syscall arg */
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/* (already in %ecx) 4th arg: 2nd syscall arg */
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movl %ebx,%edx /* 3rd arg: 1st syscall arg */
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movl %eax,%esi /* 2nd arg: syscall number */
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movl $AUDIT_ARCH_I386,%edi /* 1st arg: audit arch */
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call __audit_syscall_entry
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movl RAX-ARGOFFSET(%rsp),%eax /* reload syscall number */
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cmpq $(IA32_NR_syscalls-1),%rax
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ja ia32_badsys
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movl %ebx,%edi /* reload 1st syscall arg */
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movl RCX-ARGOFFSET(%rsp),%esi /* reload 2nd syscall arg */
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movl RDX-ARGOFFSET(%rsp),%edx /* reload 3rd syscall arg */
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movl RSI-ARGOFFSET(%rsp),%ecx /* reload 4th syscall arg */
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movl RDI-ARGOFFSET(%rsp),%r8d /* reload 5th syscall arg */
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.endm
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.macro auditsys_exit exit
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testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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jnz ia32_ret_from_sys_call
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TRACE_IRQS_ON
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sti
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movl %eax,%esi /* second arg, syscall return value */
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cmpl $-MAX_ERRNO,%eax /* is it an error ? */
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jbe 1f
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movslq %eax, %rsi /* if error sign extend to 64 bits */
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1: setbe %al /* 1 if error, 0 if not */
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movzbl %al,%edi /* zero-extend that into %edi */
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call __audit_syscall_exit
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movq RAX-ARGOFFSET(%rsp),%rax /* reload syscall return value */
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movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi
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cli
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TRACE_IRQS_OFF
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testl %edi,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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jz \exit
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CLEAR_RREGS -ARGOFFSET
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jmp int_with_check
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.endm
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sysenter_auditsys:
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CFI_RESTORE_STATE
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auditsys_entry_common
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movl %ebp,%r9d /* reload 6th syscall arg */
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jmp sysenter_dispatch
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sysexit_audit:
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auditsys_exit sysexit_from_sys_call
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#endif
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sysenter_tracesys:
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#ifdef CONFIG_AUDITSYSCALL
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testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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jz sysenter_auditsys
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#endif
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SAVE_REST
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CLEAR_RREGS
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movq $-ENOSYS,RAX(%rsp)/* ptrace can change this for a bad syscall */
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movq %rsp,%rdi /* &pt_regs -> arg1 */
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call syscall_trace_enter
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LOAD_ARGS32 ARGOFFSET /* reload args from stack in case ptrace changed it */
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RESTORE_REST
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cmpq $(IA32_NR_syscalls-1),%rax
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ja int_ret_from_sys_call /* sysenter_tracesys has set RAX(%rsp) */
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jmp sysenter_do_call
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CFI_ENDPROC
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ENDPROC(ia32_sysenter_target)
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/*
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* 32bit SYSCALL instruction entry.
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*
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* Arguments:
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* %eax System call number.
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* %ebx Arg1
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* %ecx return EIP
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* %edx Arg3
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* %esi Arg4
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* %edi Arg5
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* %ebp Arg2 [note: not saved in the stack frame, should not be touched]
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* %esp user stack
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* 0(%esp) Arg6
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*
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* Interrupts off.
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*
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* This is purely a fast path. For anything complicated we use the int 0x80
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* path below. Set up a complete hardware stack frame to share code
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* with the int 0x80 path.
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*/
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ENTRY(ia32_cstar_target)
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CFI_STARTPROC32 simple
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CFI_SIGNAL_FRAME
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CFI_DEF_CFA rsp,KERNEL_STACK_OFFSET
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CFI_REGISTER rip,rcx
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/*CFI_REGISTER rflags,r11*/
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SWAPGS_UNSAFE_STACK
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movl %esp,%r8d
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CFI_REGISTER rsp,r8
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movq PER_CPU_VAR(kernel_stack),%rsp
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/*
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* No need to follow this irqs on/off section: the syscall
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* disabled irqs and here we enable it straight after entry:
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*/
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ENABLE_INTERRUPTS(CLBR_NONE)
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SAVE_ARGS 8,0,0
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movl %eax,%eax /* zero extension */
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movq %rax,ORIG_RAX-ARGOFFSET(%rsp)
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movq %rcx,RIP-ARGOFFSET(%rsp)
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CFI_REL_OFFSET rip,RIP-ARGOFFSET
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movq %rbp,RCX-ARGOFFSET(%rsp) /* this lies slightly to ptrace */
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movl %ebp,%ecx
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movq $__USER32_CS,CS-ARGOFFSET(%rsp)
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movq $__USER32_DS,SS-ARGOFFSET(%rsp)
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movq %r11,EFLAGS-ARGOFFSET(%rsp)
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/*CFI_REL_OFFSET rflags,EFLAGS-ARGOFFSET*/
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movq %r8,RSP-ARGOFFSET(%rsp)
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CFI_REL_OFFSET rsp,RSP-ARGOFFSET
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/* no need to do an access_ok check here because r8 has been
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32bit zero extended */
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/* hardware stack frame is complete now */
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ASM_STAC
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1: movl (%r8),%r9d
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_ASM_EXTABLE(1b,ia32_badarg)
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ASM_CLAC
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orl $TS_COMPAT,TI_status+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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CFI_REMEMBER_STATE
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jnz cstar_tracesys
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cmpq $IA32_NR_syscalls-1,%rax
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ja ia32_badsys
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cstar_do_call:
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IA32_ARG_FIXUP 1
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cstar_dispatch:
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call *ia32_sys_call_table(,%rax,8)
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movq %rax,RAX-ARGOFFSET(%rsp)
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DISABLE_INTERRUPTS(CLBR_NONE)
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TRACE_IRQS_OFF
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testl $_TIF_ALLWORK_MASK,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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jnz sysretl_audit
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sysretl_from_sys_call:
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andl $~TS_COMPAT,TI_status+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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RESTORE_ARGS 0,-ARG_SKIP,0,0,0
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movl RIP-ARGOFFSET(%rsp),%ecx
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CFI_REGISTER rip,rcx
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movl EFLAGS-ARGOFFSET(%rsp),%r11d
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/*CFI_REGISTER rflags,r11*/
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xorq %r10,%r10
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xorq %r9,%r9
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xorq %r8,%r8
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TRACE_IRQS_ON
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movl RSP-ARGOFFSET(%rsp),%esp
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CFI_RESTORE rsp
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USERGS_SYSRET32
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#ifdef CONFIG_AUDITSYSCALL
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cstar_auditsys:
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CFI_RESTORE_STATE
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movl %r9d,R9-ARGOFFSET(%rsp) /* register to be clobbered by call */
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auditsys_entry_common
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movl R9-ARGOFFSET(%rsp),%r9d /* reload 6th syscall arg */
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jmp cstar_dispatch
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sysretl_audit:
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auditsys_exit sysretl_from_sys_call
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#endif
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cstar_tracesys:
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#ifdef CONFIG_AUDITSYSCALL
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testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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jz cstar_auditsys
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#endif
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xchgl %r9d,%ebp
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SAVE_REST
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CLEAR_RREGS 0, r9
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movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */
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movq %rsp,%rdi /* &pt_regs -> arg1 */
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call syscall_trace_enter
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LOAD_ARGS32 ARGOFFSET, 1 /* reload args from stack in case ptrace changed it */
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RESTORE_REST
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xchgl %ebp,%r9d
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cmpq $(IA32_NR_syscalls-1),%rax
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ja int_ret_from_sys_call /* cstar_tracesys has set RAX(%rsp) */
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jmp cstar_do_call
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END(ia32_cstar_target)
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ia32_badarg:
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ASM_CLAC
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movq $-EFAULT,%rax
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jmp ia32_sysret
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CFI_ENDPROC
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/*
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* Emulated IA32 system calls via int 0x80.
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*
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* Arguments:
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* %eax System call number.
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* %ebx Arg1
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* %ecx Arg2
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* %edx Arg3
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* %esi Arg4
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* %edi Arg5
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* %ebp Arg6 [note: not saved in the stack frame, should not be touched]
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*
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* Notes:
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* Uses the same stack frame as the x86-64 version.
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* All registers except %eax must be saved (but ptrace may violate that)
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* Arguments are zero extended. For system calls that want sign extension and
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* take long arguments a wrapper is needed. Most calls can just be called
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* directly.
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* Assumes it is only called from user space and entered with interrupts off.
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*/
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ENTRY(ia32_syscall)
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CFI_STARTPROC32 simple
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CFI_SIGNAL_FRAME
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CFI_DEF_CFA rsp,SS+8-RIP
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/*CFI_REL_OFFSET ss,SS-RIP*/
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CFI_REL_OFFSET rsp,RSP-RIP
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/*CFI_REL_OFFSET rflags,EFLAGS-RIP*/
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/*CFI_REL_OFFSET cs,CS-RIP*/
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CFI_REL_OFFSET rip,RIP-RIP
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PARAVIRT_ADJUST_EXCEPTION_FRAME
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SWAPGS
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/*
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* No need to follow this irqs on/off section: the syscall
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* disabled irqs and here we enable it straight after entry:
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*/
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ENABLE_INTERRUPTS(CLBR_NONE)
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movl %eax,%eax
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pushq_cfi %rax
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cld
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/* note the registers are not zero extended to the sf.
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this could be a problem. */
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SAVE_ARGS 0,1,0
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orl $TS_COMPAT,TI_status+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET)
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jnz ia32_tracesys
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cmpq $(IA32_NR_syscalls-1),%rax
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ja ia32_badsys
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ia32_do_call:
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IA32_ARG_FIXUP
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call *ia32_sys_call_table(,%rax,8) # xxx: rip relative
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ia32_sysret:
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movq %rax,RAX-ARGOFFSET(%rsp)
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ia32_ret_from_sys_call:
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CLEAR_RREGS -ARGOFFSET
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jmp int_ret_from_sys_call
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ia32_tracesys:
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SAVE_REST
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CLEAR_RREGS
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movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */
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movq %rsp,%rdi /* &pt_regs -> arg1 */
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call syscall_trace_enter
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LOAD_ARGS32 ARGOFFSET /* reload args from stack in case ptrace changed it */
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RESTORE_REST
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cmpq $(IA32_NR_syscalls-1),%rax
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ja int_ret_from_sys_call /* ia32_tracesys has set RAX(%rsp) */
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jmp ia32_do_call
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END(ia32_syscall)
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ia32_badsys:
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movq $0,ORIG_RAX-ARGOFFSET(%rsp)
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movq $-ENOSYS,%rax
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jmp ia32_sysret
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CFI_ENDPROC
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.macro PTREGSCALL label, func, arg
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ALIGN
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GLOBAL(\label)
|
|
leaq \func(%rip),%rax
|
|
leaq -ARGOFFSET+8(%rsp),\arg /* 8 for return address */
|
|
jmp ia32_ptregs_common
|
|
.endm
|
|
|
|
CFI_STARTPROC32
|
|
|
|
PTREGSCALL stub32_rt_sigreturn, sys32_rt_sigreturn, %rdi
|
|
PTREGSCALL stub32_sigreturn, sys32_sigreturn, %rdi
|
|
PTREGSCALL stub32_sigaltstack, sys32_sigaltstack, %rdx
|
|
PTREGSCALL stub32_execve, compat_sys_execve, %rcx
|
|
PTREGSCALL stub32_fork, sys_fork, %rdi
|
|
PTREGSCALL stub32_clone, sys32_clone, %rdx
|
|
PTREGSCALL stub32_vfork, sys_vfork, %rdi
|
|
PTREGSCALL stub32_iopl, sys_iopl, %rsi
|
|
|
|
ALIGN
|
|
ia32_ptregs_common:
|
|
popq %r11
|
|
CFI_ENDPROC
|
|
CFI_STARTPROC32 simple
|
|
CFI_SIGNAL_FRAME
|
|
CFI_DEF_CFA rsp,SS+8-ARGOFFSET
|
|
CFI_REL_OFFSET rax,RAX-ARGOFFSET
|
|
CFI_REL_OFFSET rcx,RCX-ARGOFFSET
|
|
CFI_REL_OFFSET rdx,RDX-ARGOFFSET
|
|
CFI_REL_OFFSET rsi,RSI-ARGOFFSET
|
|
CFI_REL_OFFSET rdi,RDI-ARGOFFSET
|
|
CFI_REL_OFFSET rip,RIP-ARGOFFSET
|
|
/* CFI_REL_OFFSET cs,CS-ARGOFFSET*/
|
|
/* CFI_REL_OFFSET rflags,EFLAGS-ARGOFFSET*/
|
|
CFI_REL_OFFSET rsp,RSP-ARGOFFSET
|
|
/* CFI_REL_OFFSET ss,SS-ARGOFFSET*/
|
|
SAVE_REST
|
|
call *%rax
|
|
RESTORE_REST
|
|
jmp ia32_sysret /* misbalances the return cache */
|
|
CFI_ENDPROC
|
|
END(ia32_ptregs_common)
|