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Date: Sun, 18 Jan 2015 02:17:40 +0100 From: Alexander van Heukelum <heukelum@...tmail.fm> To: Andy Lutomirski <luto@...capital.net>, x86@...nel.org, linux-kernel@...r.kernel.org Cc: Frederic Weisbecker <fweisbec@...il.com>, Oleg Nesterov <oleg@...hat.com>, Borislav Petkov <bp@...e.de>, Rik van Riel <riel@...hat.com> Subject: [PATCH 1/3] x86_64: remove KERNEL_STACK_OFFSET from THREAD_INFO macro In the macro THREAD_INFO(reg,offset), the offset is relative to KERNEL_STACK_OFFSET. Change the macro and all its uses so that offset is given as the current top of stack in the pt_regs frame. The generated code is identical. Signed-off-by: Alexander van Heukelum <heukelum@...tmail.fm> --- arch/x86/ia32/ia32entry.S | 30 +++++++++++++++--------------- arch/x86/include/asm/calling.h | 1 + arch/x86/include/asm/thread_info.h | 2 +- arch/x86/kernel/entry_64.S | 4 ++-- 4 files changed, 19 insertions(+), 18 deletions(-) diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S index 156ebca..1c74f39 100644 --- a/arch/x86/ia32/ia32entry.S +++ b/arch/x86/ia32/ia32entry.S @@ -135,7 +135,7 @@ ENTRY(ia32_sysenter_target) CFI_REL_OFFSET rsp,0 pushfq_cfi /*CFI_REL_OFFSET rflags,0*/ - movl TI_sysenter_return+THREAD_INFO(%rsp,3*8-KERNEL_STACK_OFFSET),%r10d + movl TI_sysenter_return+THREAD_INFO(%rsp,EFLAGS),%r10d CFI_REGISTER rip,r10 pushq_cfi $__USER32_CS /*CFI_REL_OFFSET cs,0*/ @@ -161,8 +161,8 @@ ENTRY(ia32_sysenter_target) jnz sysenter_fix_flags sysenter_flags_fixed: - orl $TS_COMPAT,TI_status+THREAD_INFO(%rsp,RIP-ARGOFFSET) - testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET) + orl $TS_COMPAT,TI_status+THREAD_INFO(%rsp,ARGOFFSET) + testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags+THREAD_INFO(%rsp,ARGOFFSET) CFI_REMEMBER_STATE jnz sysenter_tracesys cmpq $(IA32_NR_syscalls-1),%rax @@ -174,10 +174,10 @@ sysenter_dispatch: movq %rax,RAX-ARGOFFSET(%rsp) DISABLE_INTERRUPTS(CLBR_NONE) TRACE_IRQS_OFF - testl $_TIF_ALLWORK_MASK,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET) + testl $_TIF_ALLWORK_MASK,TI_flags+THREAD_INFO(%rsp,ARGOFFSET) jnz sysexit_audit sysexit_from_sys_call: - andl $~TS_COMPAT,TI_status+THREAD_INFO(%rsp,RIP-ARGOFFSET) + andl $~TS_COMPAT,TI_status+THREAD_INFO(%rsp,ARGOFFSET) /* clear IF, that popfq doesn't enable interrupts early */ andl $~0x200,EFLAGS-ARGOFFSET(%rsp) movl RIP-ARGOFFSET(%rsp),%edx /* User %eip */ @@ -216,7 +216,7 @@ sysexit_from_sys_call: .endm .macro auditsys_exit exit - testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET) + testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),TI_flags+THREAD_INFO(%rsp,ARGOFFSET) jnz ia32_ret_from_sys_call TRACE_IRQS_ON ENABLE_INTERRUPTS(CLBR_NONE) @@ -231,7 +231,7 @@ sysexit_from_sys_call: movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi DISABLE_INTERRUPTS(CLBR_NONE) TRACE_IRQS_OFF - testl %edi,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET) + testl %edi,TI_flags+THREAD_INFO(%rsp,ARGOFFSET) jz \exit CLEAR_RREGS -ARGOFFSET jmp int_with_check @@ -253,7 +253,7 @@ sysenter_fix_flags: sysenter_tracesys: #ifdef CONFIG_AUDITSYSCALL - testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET) + testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags+THREAD_INFO(%rsp,ARGOFFSET) jz sysenter_auditsys #endif SAVE_REST @@ -324,8 +324,8 @@ ENTRY(ia32_cstar_target) 1: movl (%r8),%r9d _ASM_EXTABLE(1b,ia32_badarg) ASM_CLAC - orl $TS_COMPAT,TI_status+THREAD_INFO(%rsp,RIP-ARGOFFSET) - testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET) + orl $TS_COMPAT,TI_status+THREAD_INFO(%rsp,ARGOFFSET) + testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags+THREAD_INFO(%rsp,ARGOFFSET) CFI_REMEMBER_STATE jnz cstar_tracesys cmpq $IA32_NR_syscalls-1,%rax @@ -337,10 +337,10 @@ cstar_dispatch: movq %rax,RAX-ARGOFFSET(%rsp) DISABLE_INTERRUPTS(CLBR_NONE) TRACE_IRQS_OFF - testl $_TIF_ALLWORK_MASK,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET) + testl $_TIF_ALLWORK_MASK,TI_flags+THREAD_INFO(%rsp,ARGOFFSET) jnz sysretl_audit sysretl_from_sys_call: - andl $~TS_COMPAT,TI_status+THREAD_INFO(%rsp,RIP-ARGOFFSET) + andl $~TS_COMPAT,TI_status+THREAD_INFO(%rsp,ARGOFFSET) RESTORE_ARGS 0,-ARG_SKIP,0,0,0 movl RIP-ARGOFFSET(%rsp),%ecx CFI_REGISTER rip,rcx @@ -368,7 +368,7 @@ sysretl_audit: cstar_tracesys: #ifdef CONFIG_AUDITSYSCALL - testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET) + testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT),TI_flags+THREAD_INFO(%rsp,ARGOFFSET) jz cstar_auditsys #endif xchgl %r9d,%ebp @@ -434,8 +434,8 @@ ENTRY(ia32_syscall) /* note the registers are not zero extended to the sf. this could be a problem. */ SAVE_ARGS 0,1,0 - orl $TS_COMPAT,TI_status+THREAD_INFO(%rsp,RIP-ARGOFFSET) - testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET) + orl $TS_COMPAT,TI_status+THREAD_INFO(%rsp,ARGOFFSET) + testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags+THREAD_INFO(%rsp,ARGOFFSET) jnz ia32_tracesys cmpq $(IA32_NR_syscalls-1),%rax ja ia32_badsys diff --git a/arch/x86/include/asm/calling.h b/arch/x86/include/asm/calling.h index 1f1297b..16ab13d 100644 --- a/arch/x86/include/asm/calling.h +++ b/arch/x86/include/asm/calling.h @@ -81,6 +81,7 @@ For 32-bit we have the following conventions - kernel is built with #define EFLAGS 144 #define RSP 152 #define SS 160 +#define PTREGS_SIZE 168 #define ARGOFFSET R11 diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h index e82e95a..471037d 100644 --- a/arch/x86/include/asm/thread_info.h +++ b/arch/x86/include/asm/thread_info.h @@ -190,7 +190,7 @@ static inline unsigned long current_stack_pointer(void) * Same if PER_CPU_VAR(kernel_stack) is, perhaps with some offset, already in * a certain register (to be used in assembler memory operands). */ -#define THREAD_INFO(reg, off) KERNEL_STACK_OFFSET+(off)-THREAD_SIZE(reg) +#define THREAD_INFO(reg, off) PTREGS_SIZE-(off)-THREAD_SIZE(reg) #endif diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index db13655..9f9ca20 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -343,7 +343,7 @@ GLOBAL(system_call_after_swapgs) movq_cfi rax,(ORIG_RAX-ARGOFFSET) movq %rcx,RIP-ARGOFFSET(%rsp) CFI_REL_OFFSET rip,RIP-ARGOFFSET - testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET) + testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags+THREAD_INFO(%rsp,ARGOFFSET) jnz tracesys system_call_fastpath: #if __SYSCALL_MASK == ~0 @@ -361,7 +361,7 @@ system_call_fastpath: * Has incomplete stack frame and undefined top of stack. */ ret_from_sys_call: - testl $_TIF_ALLWORK_MASK,TI_flags+THREAD_INFO(%rsp,RIP-ARGOFFSET) + testl $_TIF_ALLWORK_MASK,TI_flags+THREAD_INFO(%rsp,ARGOFFSET) jnz int_ret_from_sys_call_fixup /* Go the the slow path */ LOCKDEP_SYS_EXIT -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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