| /* |
| * Compatibility mode system call entry point for x86-64. |
| * |
| * Copyright 2000-2002 Andi Kleen, SuSE Labs. |
| */ |
| |
| #include <asm/dwarf2.h> |
| #include <asm/calling.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/current.h> |
| #include <asm/errno.h> |
| #include <asm/ia32_unistd.h> |
| #include <asm/thread_info.h> |
| #include <asm/segment.h> |
| #include <asm/irqflags.h> |
| #include <asm/asm.h> |
| #include <asm/smap.h> |
| #include <linux/linkage.h> |
| #include <linux/err.h> |
| |
| /* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */ |
| #include <linux/elf-em.h> |
| #define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE) |
| #define __AUDIT_ARCH_LE 0x40000000 |
| |
| #ifndef CONFIG_AUDITSYSCALL |
| #define sysexit_audit ia32_ret_from_sys_call |
| #define sysretl_audit ia32_ret_from_sys_call |
| #endif |
| |
| .section .entry.text, "ax" |
| |
| /* clobbers %rax */ |
| .macro CLEAR_RREGS _r9=rax |
| xorl %eax,%eax |
| movq %rax,R11(%rsp) |
| movq %rax,R10(%rsp) |
| movq %\_r9,R9(%rsp) |
| movq %rax,R8(%rsp) |
| .endm |
| |
| /* |
| * Reload arg registers from stack in case ptrace changed them. |
| * We don't reload %eax because syscall_trace_enter() returned |
| * the %rax value we should see. Instead, we just truncate that |
| * value to 32 bits again as we did on entry from user mode. |
| * If it's a new value set by user_regset during entry tracing, |
| * this matches the normal truncation of the user-mode value. |
| * If it's -1 to make us punt the syscall, then (u32)-1 is still |
| * an appropriately invalid value. |
| */ |
| .macro LOAD_ARGS32 _r9=0 |
| .if \_r9 |
| movl R9(%rsp),%r9d |
| .endif |
| movl RCX(%rsp),%ecx |
| movl RDX(%rsp),%edx |
| movl RSI(%rsp),%esi |
| movl RDI(%rsp),%edi |
| movl %eax,%eax /* zero extension */ |
| .endm |
| |
| .macro CFI_STARTPROC32 simple |
| CFI_STARTPROC \simple |
| CFI_UNDEFINED r8 |
| CFI_UNDEFINED r9 |
| CFI_UNDEFINED r10 |
| CFI_UNDEFINED r11 |
| CFI_UNDEFINED r12 |
| CFI_UNDEFINED r13 |
| CFI_UNDEFINED r14 |
| CFI_UNDEFINED r15 |
| .endm |
| |
| #ifdef CONFIG_PARAVIRT |
| ENTRY(native_usergs_sysret32) |
| swapgs |
| sysretl |
| ENDPROC(native_usergs_sysret32) |
| |
| ENTRY(native_irq_enable_sysexit) |
| swapgs |
| sti |
| sysexit |
| ENDPROC(native_irq_enable_sysexit) |
| #endif |
| |
| /* |
| * 32bit SYSENTER instruction entry. |
| * |
| * SYSENTER loads ss, rsp, cs, and rip from previously programmed MSRs. |
| * IF and VM in rflags are cleared (IOW: interrupts are off). |
| * SYSENTER does not save anything on the stack, |
| * and does not save old rip (!!!) and rflags. |
| * |
| * Arguments: |
| * eax system call number |
| * ebx arg1 |
| * ecx arg2 |
| * edx arg3 |
| * esi arg4 |
| * edi arg5 |
| * ebp user stack |
| * 0(%ebp) arg6 |
| * |
| * This is purely a fast path. For anything complicated we use the int 0x80 |
| * path below. We set up a complete hardware stack frame to share code |
| * with the int 0x80 path. |
| */ |
| ENTRY(ia32_sysenter_target) |
| CFI_STARTPROC32 simple |
| CFI_SIGNAL_FRAME |
| CFI_DEF_CFA rsp,0 |
| CFI_REGISTER rsp,rbp |
| |
| /* |
| * Interrupts are off on entry. |
| * We do not frame this tiny irq-off block with TRACE_IRQS_OFF/ON, |
| * it is too small to ever cause noticeable irq latency. |
| */ |
| SWAPGS_UNSAFE_STACK |
| movq PER_CPU_VAR(cpu_tss + TSS_sp0), %rsp |
| ENABLE_INTERRUPTS(CLBR_NONE) |
| |
| /* Zero-extending 32-bit regs, do not remove */ |
| movl %ebp, %ebp |
| movl %eax, %eax |
| |
| movl ASM_THREAD_INFO(TI_sysenter_return, %rsp, 0), %r10d |
| CFI_REGISTER rip,r10 |
| |
| /* Construct struct pt_regs on stack */ |
| pushq_cfi $__USER32_DS /* pt_regs->ss */ |
| pushq_cfi %rbp /* pt_regs->sp */ |
| CFI_REL_OFFSET rsp,0 |
| pushfq_cfi /* pt_regs->flags */ |
| pushq_cfi $__USER32_CS /* pt_regs->cs */ |
| pushq_cfi %r10 /* pt_regs->ip = thread_info->sysenter_return */ |
| CFI_REL_OFFSET rip,0 |
| pushq_cfi_reg rax /* pt_regs->orig_ax */ |
| pushq_cfi_reg rdi /* pt_regs->di */ |
| pushq_cfi_reg rsi /* pt_regs->si */ |
| pushq_cfi_reg rdx /* pt_regs->dx */ |
| pushq_cfi_reg rcx /* pt_regs->cx */ |
| pushq_cfi_reg rax /* pt_regs->ax */ |
| cld |
| sub $(10*8),%rsp /* pt_regs->r8-11,bp,bx,r12-15 not saved */ |
| CFI_ADJUST_CFA_OFFSET 10*8 |
| |
| /* |
| * no need to do an access_ok check here because rbp has been |
| * 32bit zero extended |
| */ |
| ASM_STAC |
| 1: movl (%rbp),%ebp |
| _ASM_EXTABLE(1b,ia32_badarg) |
| ASM_CLAC |
| |
| /* |
| * Sysenter doesn't filter flags, so we need to clear NT |
| * ourselves. To save a few cycles, we can check whether |
| * NT was set instead of doing an unconditional popfq. |
| */ |
| testl $X86_EFLAGS_NT,EFLAGS(%rsp) |
| jnz sysenter_fix_flags |
| sysenter_flags_fixed: |
| |
| orl $TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS) |
| testl $_TIF_WORK_SYSCALL_ENTRY, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS) |
| CFI_REMEMBER_STATE |
| jnz sysenter_tracesys |
| cmpq $(IA32_NR_syscalls-1),%rax |
| ja ia32_badsys |
| sysenter_do_call: |
| /* 32bit syscall -> 64bit C ABI argument conversion */ |
| movl %edi,%r8d /* arg5 */ |
| movl %ebp,%r9d /* arg6 */ |
| xchg %ecx,%esi /* rsi:arg2, rcx:arg4 */ |
| movl %ebx,%edi /* arg1 */ |
| movl %edx,%edx /* arg3 (zero extension) */ |
| sysenter_dispatch: |
| call *ia32_sys_call_table(,%rax,8) |
| movq %rax,RAX(%rsp) |
| DISABLE_INTERRUPTS(CLBR_NONE) |
| TRACE_IRQS_OFF |
| testl $_TIF_ALLWORK_MASK, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS) |
| jnz sysexit_audit |
| sysexit_from_sys_call: |
| /* |
| * NB: SYSEXIT is not obviously safe for 64-bit kernels -- an |
| * NMI between STI and SYSEXIT has poorly specified behavior, |
| * and and NMI followed by an IRQ with usergs is fatal. So |
| * we just pretend we're using SYSEXIT but we really use |
| * SYSRETL instead. |
| * |
| * This code path is still called 'sysexit' because it pairs |
| * with 'sysenter' and it uses the SYSENTER calling convention. |
| */ |
| andl $~TS_COMPAT,ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS) |
| movl RIP(%rsp),%ecx /* User %eip */ |
| CFI_REGISTER rip,rcx |
| RESTORE_RSI_RDI |
| xorl %edx,%edx /* avoid info leaks */ |
| xorq %r8,%r8 |
| xorq %r9,%r9 |
| xorq %r10,%r10 |
| movl EFLAGS(%rsp),%r11d /* User eflags */ |
| /*CFI_RESTORE rflags*/ |
| TRACE_IRQS_ON |
| |
| /* |
| * SYSRETL works even on Intel CPUs. Use it in preference to SYSEXIT, |
| * since it avoids a dicey window with interrupts enabled. |
| */ |
| movl RSP(%rsp),%esp |
| |
| /* |
| * USERGS_SYSRET32 does: |
| * gsbase = user's gs base |
| * eip = ecx |
| * rflags = r11 |
| * cs = __USER32_CS |
| * ss = __USER_DS |
| * |
| * The prologue set RIP(%rsp) to VDSO32_SYSENTER_RETURN, which does: |
| * |
| * pop %ebp |
| * pop %edx |
| * pop %ecx |
| * |
| * Therefore, we invoke SYSRETL with EDX and R8-R10 zeroed to |
| * avoid info leaks. R11 ends up with VDSO32_SYSENTER_RETURN's |
| * address (already known to user code), and R12-R15 are |
| * callee-saved and therefore don't contain any interesting |
| * kernel data. |
| */ |
| USERGS_SYSRET32 |
| |
| CFI_RESTORE_STATE |
| |
| #ifdef CONFIG_AUDITSYSCALL |
| .macro auditsys_entry_common |
| movl %esi,%r8d /* 5th arg: 4th syscall arg */ |
| movl %ecx,%r9d /*swap with edx*/ |
| movl %edx,%ecx /* 4th arg: 3rd syscall arg */ |
| movl %r9d,%edx /* 3rd arg: 2nd syscall arg */ |
| movl %ebx,%esi /* 2nd arg: 1st syscall arg */ |
| movl %eax,%edi /* 1st arg: syscall number */ |
| call __audit_syscall_entry |
| movl RAX(%rsp),%eax /* reload syscall number */ |
| cmpq $(IA32_NR_syscalls-1),%rax |
| ja ia32_badsys |
| movl %ebx,%edi /* reload 1st syscall arg */ |
| movl RCX(%rsp),%esi /* reload 2nd syscall arg */ |
| movl RDX(%rsp),%edx /* reload 3rd syscall arg */ |
| movl RSI(%rsp),%ecx /* reload 4th syscall arg */ |
| movl RDI(%rsp),%r8d /* reload 5th syscall arg */ |
| .endm |
| |
| .macro auditsys_exit exit |
| testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS) |
| jnz ia32_ret_from_sys_call |
| TRACE_IRQS_ON |
| ENABLE_INTERRUPTS(CLBR_NONE) |
| movl %eax,%esi /* second arg, syscall return value */ |
| cmpl $-MAX_ERRNO,%eax /* is it an error ? */ |
| jbe 1f |
| movslq %eax, %rsi /* if error sign extend to 64 bits */ |
| 1: setbe %al /* 1 if error, 0 if not */ |
| movzbl %al,%edi /* zero-extend that into %edi */ |
| call __audit_syscall_exit |
| movq RAX(%rsp),%rax /* reload syscall return value */ |
| movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi |
| DISABLE_INTERRUPTS(CLBR_NONE) |
| TRACE_IRQS_OFF |
| testl %edi, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS) |
| jz \exit |
| CLEAR_RREGS |
| jmp int_with_check |
| .endm |
| |
| sysenter_auditsys: |
| auditsys_entry_common |
| movl %ebp,%r9d /* reload 6th syscall arg */ |
| jmp sysenter_dispatch |
| |
| sysexit_audit: |
| auditsys_exit sysexit_from_sys_call |
| #endif |
| |
| sysenter_fix_flags: |
| pushq_cfi $(X86_EFLAGS_IF|X86_EFLAGS_FIXED) |
| popfq_cfi |
| jmp sysenter_flags_fixed |
| |
| sysenter_tracesys: |
| #ifdef CONFIG_AUDITSYSCALL |
| testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT), ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS) |
| jz sysenter_auditsys |
| #endif |
| SAVE_EXTRA_REGS |
| CLEAR_RREGS |
| movq $-ENOSYS,RAX(%rsp)/* ptrace can change this for a bad syscall */ |
| movq %rsp,%rdi /* &pt_regs -> arg1 */ |
| call syscall_trace_enter |
| LOAD_ARGS32 /* reload args from stack in case ptrace changed it */ |
| RESTORE_EXTRA_REGS |
| cmpq $(IA32_NR_syscalls-1),%rax |
| ja int_ret_from_sys_call /* sysenter_tracesys has set RAX(%rsp) */ |
| jmp sysenter_do_call |
| CFI_ENDPROC |
| ENDPROC(ia32_sysenter_target) |
| |
| /* |
| * 32bit SYSCALL instruction entry. |
| * |
| * 32bit SYSCALL saves rip to rcx, clears rflags.RF, then saves rflags to r11, |
| * then loads new ss, cs, and rip from previously programmed MSRs. |
| * rflags gets masked by a value from another MSR (so CLD and CLAC |
| * are not needed). SYSCALL does not save anything on the stack |
| * and does not change rsp. |
| * |
| * Note: rflags saving+masking-with-MSR happens only in Long mode |
| * (in legacy 32bit mode, IF, RF and VM bits are cleared and that's it). |
| * Don't get confused: rflags saving+masking depends on Long Mode Active bit |
| * (EFER.LMA=1), NOT on bitness of userspace where SYSCALL executes |
| * or target CS descriptor's L bit (SYSCALL does not read segment descriptors). |
| * |
| * Arguments: |
| * eax system call number |
| * ecx return address |
| * ebx arg1 |
| * ebp arg2 (note: not saved in the stack frame, should not be touched) |
| * edx arg3 |
| * esi arg4 |
| * edi arg5 |
| * esp user stack |
| * 0(%esp) arg6 |
| * |
| * This is purely a fast path. For anything complicated we use the int 0x80 |
| * path below. We set up a complete hardware stack frame to share code |
| * with the int 0x80 path. |
| */ |
| ENTRY(ia32_cstar_target) |
| CFI_STARTPROC32 simple |
| CFI_SIGNAL_FRAME |
| CFI_DEF_CFA rsp,0 |
| CFI_REGISTER rip,rcx |
| /*CFI_REGISTER rflags,r11*/ |
| |
| /* |
| * Interrupts are off on entry. |
| * We do not frame this tiny irq-off block with TRACE_IRQS_OFF/ON, |
| * it is too small to ever cause noticeable irq latency. |
| */ |
| SWAPGS_UNSAFE_STACK |
| movl %esp,%r8d |
| CFI_REGISTER rsp,r8 |
| movq PER_CPU_VAR(kernel_stack),%rsp |
| ENABLE_INTERRUPTS(CLBR_NONE) |
| |
| /* Zero-extending 32-bit regs, do not remove */ |
| movl %eax,%eax |
| |
| /* Construct struct pt_regs on stack */ |
| pushq_cfi $__USER32_DS /* pt_regs->ss */ |
| pushq_cfi %r8 /* pt_regs->sp */ |
| CFI_REL_OFFSET rsp,0 |
| pushq_cfi %r11 /* pt_regs->flags */ |
| pushq_cfi $__USER32_CS /* pt_regs->cs */ |
| pushq_cfi %rcx /* pt_regs->ip */ |
| CFI_REL_OFFSET rip,0 |
| pushq_cfi_reg rax /* pt_regs->orig_ax */ |
| pushq_cfi_reg rdi /* pt_regs->di */ |
| pushq_cfi_reg rsi /* pt_regs->si */ |
| pushq_cfi_reg rdx /* pt_regs->dx */ |
| pushq_cfi_reg rbp /* pt_regs->cx */ |
| movl %ebp,%ecx |
| pushq_cfi_reg rax /* pt_regs->ax */ |
| sub $(10*8),%rsp /* pt_regs->r8-11,bp,bx,r12-15 not saved */ |
| CFI_ADJUST_CFA_OFFSET 10*8 |
| |
| /* |
| * no need to do an access_ok check here because r8 has been |
| * 32bit zero extended |
| */ |
| ASM_STAC |
| 1: movl (%r8),%r9d |
| _ASM_EXTABLE(1b,ia32_badarg) |
| ASM_CLAC |
| orl $TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS) |
| testl $_TIF_WORK_SYSCALL_ENTRY, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS) |
| CFI_REMEMBER_STATE |
| jnz cstar_tracesys |
| cmpq $IA32_NR_syscalls-1,%rax |
| ja ia32_badsys |
| cstar_do_call: |
| /* 32bit syscall -> 64bit C ABI argument conversion */ |
| movl %edi,%r8d /* arg5 */ |
| /* r9 already loaded */ /* arg6 */ |
| xchg %ecx,%esi /* rsi:arg2, rcx:arg4 */ |
| movl %ebx,%edi /* arg1 */ |
| movl %edx,%edx /* arg3 (zero extension) */ |
| cstar_dispatch: |
| call *ia32_sys_call_table(,%rax,8) |
| movq %rax,RAX(%rsp) |
| DISABLE_INTERRUPTS(CLBR_NONE) |
| TRACE_IRQS_OFF |
| testl $_TIF_ALLWORK_MASK, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS) |
| jnz sysretl_audit |
| sysretl_from_sys_call: |
| andl $~TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS) |
| RESTORE_RSI_RDI_RDX |
| movl RIP(%rsp),%ecx |
| CFI_REGISTER rip,rcx |
| movl EFLAGS(%rsp),%r11d |
| /*CFI_REGISTER rflags,r11*/ |
| xorq %r10,%r10 |
| xorq %r9,%r9 |
| xorq %r8,%r8 |
| TRACE_IRQS_ON |
| movl RSP(%rsp),%esp |
| CFI_RESTORE rsp |
| /* |
| * 64bit->32bit SYSRET restores eip from ecx, |
| * eflags from r11 (but RF and VM bits are forced to 0), |
| * cs and ss are loaded from MSRs. |
| * (Note: 32bit->32bit SYSRET is different: since r11 |
| * does not exist, it merely sets eflags.IF=1). |
| * |
| * NB: On AMD CPUs with the X86_BUG_SYSRET_SS_ATTRS bug, the ss |
| * descriptor is not reinitialized. This means that we must |
| * avoid SYSRET with SS == NULL, which could happen if we schedule, |
| * exit the kernel, and re-enter using an interrupt vector. (All |
| * interrupt entries on x86_64 set SS to NULL.) We prevent that |
| * from happening by reloading SS in __switch_to. |
| */ |
| USERGS_SYSRET32 |
| |
| #ifdef CONFIG_AUDITSYSCALL |
| cstar_auditsys: |
| CFI_RESTORE_STATE |
| movl %r9d,R9(%rsp) /* register to be clobbered by call */ |
| auditsys_entry_common |
| movl R9(%rsp),%r9d /* reload 6th syscall arg */ |
| jmp cstar_dispatch |
| |
| sysretl_audit: |
| auditsys_exit sysretl_from_sys_call |
| #endif |
| |
| cstar_tracesys: |
| #ifdef CONFIG_AUDITSYSCALL |
| testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT), ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS) |
| jz cstar_auditsys |
| #endif |
| xchgl %r9d,%ebp |
| SAVE_EXTRA_REGS |
| CLEAR_RREGS r9 |
| movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */ |
| movq %rsp,%rdi /* &pt_regs -> arg1 */ |
| call syscall_trace_enter |
| LOAD_ARGS32 1 /* reload args from stack in case ptrace changed it */ |
| RESTORE_EXTRA_REGS |
| xchgl %ebp,%r9d |
| cmpq $(IA32_NR_syscalls-1),%rax |
| ja int_ret_from_sys_call /* cstar_tracesys has set RAX(%rsp) */ |
| jmp cstar_do_call |
| END(ia32_cstar_target) |
| |
| ia32_badarg: |
| ASM_CLAC |
| movq $-EFAULT,%rax |
| jmp ia32_sysret |
| CFI_ENDPROC |
| |
| /* |
| * Emulated IA32 system calls via int 0x80. |
| * |
| * Arguments: |
| * eax system call number |
| * ebx arg1 |
| * ecx arg2 |
| * edx arg3 |
| * esi arg4 |
| * edi arg5 |
| * ebp arg6 (note: not saved in the stack frame, should not be touched) |
| * |
| * Notes: |
| * Uses the same stack frame as the x86-64 version. |
| * All registers except eax must be saved (but ptrace may violate that). |
| * Arguments are zero extended. For system calls that want sign extension and |
| * take long arguments a wrapper is needed. Most calls can just be called |
| * directly. |
| * Assumes it is only called from user space and entered with interrupts off. |
| */ |
| |
| ENTRY(ia32_syscall) |
| CFI_STARTPROC32 simple |
| CFI_SIGNAL_FRAME |
| CFI_DEF_CFA rsp,5*8 |
| /*CFI_REL_OFFSET ss,4*8 */ |
| CFI_REL_OFFSET rsp,3*8 |
| /*CFI_REL_OFFSET rflags,2*8 */ |
| /*CFI_REL_OFFSET cs,1*8 */ |
| CFI_REL_OFFSET rip,0*8 |
| |
| /* |
| * Interrupts are off on entry. |
| * We do not frame this tiny irq-off block with TRACE_IRQS_OFF/ON, |
| * it is too small to ever cause noticeable irq latency. |
| */ |
| PARAVIRT_ADJUST_EXCEPTION_FRAME |
| SWAPGS |
| ENABLE_INTERRUPTS(CLBR_NONE) |
| |
| /* Zero-extending 32-bit regs, do not remove */ |
| movl %eax,%eax |
| |
| /* Construct struct pt_regs on stack (iret frame is already on stack) */ |
| pushq_cfi_reg rax /* pt_regs->orig_ax */ |
| pushq_cfi_reg rdi /* pt_regs->di */ |
| pushq_cfi_reg rsi /* pt_regs->si */ |
| pushq_cfi_reg rdx /* pt_regs->dx */ |
| pushq_cfi_reg rcx /* pt_regs->cx */ |
| pushq_cfi_reg rax /* pt_regs->ax */ |
| cld |
| sub $(10*8),%rsp /* pt_regs->r8-11,bp,bx,r12-15 not saved */ |
| CFI_ADJUST_CFA_OFFSET 10*8 |
| |
| orl $TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS) |
| testl $_TIF_WORK_SYSCALL_ENTRY, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS) |
| jnz ia32_tracesys |
| cmpq $(IA32_NR_syscalls-1),%rax |
| ja ia32_badsys |
| ia32_do_call: |
| /* 32bit syscall -> 64bit C ABI argument conversion */ |
| movl %edi,%r8d /* arg5 */ |
| movl %ebp,%r9d /* arg6 */ |
| xchg %ecx,%esi /* rsi:arg2, rcx:arg4 */ |
| movl %ebx,%edi /* arg1 */ |
| movl %edx,%edx /* arg3 (zero extension) */ |
| call *ia32_sys_call_table(,%rax,8) # xxx: rip relative |
| ia32_sysret: |
| movq %rax,RAX(%rsp) |
| ia32_ret_from_sys_call: |
| CLEAR_RREGS |
| jmp int_ret_from_sys_call |
| |
| ia32_tracesys: |
| SAVE_EXTRA_REGS |
| CLEAR_RREGS |
| movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */ |
| movq %rsp,%rdi /* &pt_regs -> arg1 */ |
| call syscall_trace_enter |
| LOAD_ARGS32 /* reload args from stack in case ptrace changed it */ |
| RESTORE_EXTRA_REGS |
| cmpq $(IA32_NR_syscalls-1),%rax |
| ja int_ret_from_sys_call /* ia32_tracesys has set RAX(%rsp) */ |
| jmp ia32_do_call |
| END(ia32_syscall) |
| |
| ia32_badsys: |
| movq $0,ORIG_RAX(%rsp) |
| movq $-ENOSYS,%rax |
| jmp ia32_sysret |
| |
| CFI_ENDPROC |
| |
| .macro PTREGSCALL label, func |
| ALIGN |
| GLOBAL(\label) |
| leaq \func(%rip),%rax |
| jmp ia32_ptregs_common |
| .endm |
| |
| CFI_STARTPROC32 |
| |
| PTREGSCALL stub32_rt_sigreturn, sys32_rt_sigreturn |
| PTREGSCALL stub32_sigreturn, sys32_sigreturn |
| PTREGSCALL stub32_fork, sys_fork |
| PTREGSCALL stub32_vfork, sys_vfork |
| |
| ALIGN |
| GLOBAL(stub32_clone) |
| leaq sys_clone(%rip),%rax |
| mov %r8, %rcx |
| jmp ia32_ptregs_common |
| |
| ALIGN |
| ia32_ptregs_common: |
| CFI_ENDPROC |
| CFI_STARTPROC32 simple |
| CFI_SIGNAL_FRAME |
| CFI_DEF_CFA rsp,SIZEOF_PTREGS |
| CFI_REL_OFFSET rax,RAX |
| CFI_REL_OFFSET rcx,RCX |
| CFI_REL_OFFSET rdx,RDX |
| CFI_REL_OFFSET rsi,RSI |
| CFI_REL_OFFSET rdi,RDI |
| CFI_REL_OFFSET rip,RIP |
| /* CFI_REL_OFFSET cs,CS*/ |
| /* CFI_REL_OFFSET rflags,EFLAGS*/ |
| CFI_REL_OFFSET rsp,RSP |
| /* CFI_REL_OFFSET ss,SS*/ |
| SAVE_EXTRA_REGS 8 |
| call *%rax |
| RESTORE_EXTRA_REGS 8 |
| ret |
| CFI_ENDPROC |
| END(ia32_ptregs_common) |
