diff options
| -rw-r--r-- | arch/x86/entry/ia32entry.S | 19 |
1 files changed, 8 insertions, 11 deletions
diff --git a/arch/x86/entry/ia32entry.S b/arch/x86/entry/ia32entry.S index 56f819e99258..63219154087e 100644 --- a/arch/x86/entry/ia32entry.S +++ b/arch/x86/entry/ia32entry.S @@ -323,7 +323,7 @@ ENTRY(ia32_cstar_target) * 32bit zero extended */ ASM_STAC -1: movl (%r8),%r9d +1: movl (%r8),%ebp _ASM_EXTABLE(1b,ia32_badarg) ASM_CLAC orl $TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS) @@ -333,7 +333,7 @@ ENTRY(ia32_cstar_target) cstar_do_call: /* 32bit syscall -> 64bit C ABI argument conversion */ movl %edi,%r8d /* arg5 */ - /* r9 already loaded */ /* arg6 */ + movl %ebp,%r9d /* arg6 */ xchg %ecx,%esi /* rsi:arg2, rcx:arg4 */ movl %ebx,%edi /* arg1 */ movl %edx,%edx /* arg3 (zero extension) */ @@ -349,6 +349,7 @@ cstar_dispatch: jnz sysretl_audit sysretl_from_sys_call: andl $~TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS) + movl RCX(%rsp), %ebp RESTORE_RSI_RDI_RDX movl RIP(%rsp),%ecx movl EFLAGS(%rsp),%r11d @@ -375,9 +376,8 @@ sysretl_from_sys_call: #ifdef CONFIG_AUDITSYSCALL cstar_auditsys: - movl %r9d,R9(%rsp) /* register to be clobbered by call */ auditsys_entry_common - movl R9(%rsp),%r9d /* reload 6th syscall arg */ + movl %ebp, %r9d /* reload 6th syscall arg */ jmp cstar_dispatch sysretl_audit: @@ -389,16 +389,14 @@ cstar_tracesys: 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 xorl %eax, %eax /* do not leak kernel information */ movq %rax, R11(%rsp) movq %rax, R10(%rsp) - movq %r9, R9(%rsp) + movq %rax, R9(%rsp) movq %rax, R8(%rsp) - movq %rsp,%rdi /* &pt_regs -> arg1 */ - call syscall_trace_enter - movl R9(%rsp),%r9d + movq %rsp, %rdi /* &pt_regs -> arg1 */ + call syscall_trace_enter /* Reload arg registers from stack. (see sysenter_tracesys) */ movl RCX(%rsp), %ecx @@ -408,8 +406,7 @@ cstar_tracesys: movl %eax, %eax /* zero extension */ RESTORE_EXTRA_REGS - xchgl %ebp,%r9d - jmp cstar_do_call + jmp cstar_do_call END(ia32_cstar_target) ia32_badarg: |