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On Wed, Jul 13, 2016 at 04:48:51PM +0200, Sedat Dilek via llvm-dev wrote: > [ CCed all people who were involved in this thread ] > > Hi Tom, > > personally, I am interested to test the prebuilt-toolchains for > Ubuntu/xenial alias 16.04 LTS and Debian/Jessie v8.5.0 AMD64. > The available toolchains are incomplete and thus useless. > > Just as a fact: There is still no

...-rc4-vsyscall-above-stack/include/asm-i386/a.out.h --- linux-2.6.17-rc4/include/asm-i386/a.out.h 2004-02-04 14:43:43.000000000 +1100 +++ working-2.6.17-rc4-vsyscall-above-stack/include/asm-i386/a.out.h 2006-05-16 14:24:47.000000000 +1000 @@ -19,7 +19,7 @@ struct exec #ifdef __KERNEL__ -#define STACK_TOP TASK_SIZE +#define STACK_TOP (TASK_SIZE - 3*PAGE_SIZE) #endif diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.6.17-rc4/include/asm-i386/elf.h working-2.6.17-rc4-vsyscall-above-stack/include/asm-i386/elf.h --- linux-2.6.17-rc4/include/asm-...

...-rc4-vsyscall-above-stack/include/asm-i386/a.out.h --- linux-2.6.17-rc4/include/asm-i386/a.out.h 2004-02-04 14:43:43.000000000 +1100 +++ working-2.6.17-rc4-vsyscall-above-stack/include/asm-i386/a.out.h 2006-05-16 14:24:47.000000000 +1000 @@ -19,7 +19,7 @@ struct exec #ifdef __KERNEL__ -#define STACK_TOP TASK_SIZE +#define STACK_TOP (TASK_SIZE - 3*PAGE_SIZE) #endif diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.6.17-rc4/include/asm-i386/elf.h working-2.6.17-rc4-vsyscall-above-stack/include/asm-i386/elf.h --- linux-2.6.17-rc4/include/asm-...

...truct { */ static inline void native_set_iopl_mask(unsigned mask) { -#ifdef CONFIG_X86_32 +#if defined(CONFIG_X86_IOPORT) && defined(CONFIG_X86_32) unsigned int reg; asm volatile ("pushfl;" @@ -856,6 +868,7 @@ static inline void spin_lock_prefetch(const void *x) #define STACK_TOP TASK_SIZE #define STACK_TOP_MAX STACK_TOP +#ifdef CONFIG_X86_IOPORT #define INIT_THREAD_IO .io_bitmap_ptr = NULL, /* @@ -865,6 +878,10 @@ static inline void spin_lock_prefetch(const void *x) * be within the limit. */ #define INIT_TSS_IO .io_bitmap = { [0 ... IO_BITMAP_LONGS] = ~0 }, +...

...truct { */ static inline void native_set_iopl_mask(unsigned mask) { -#ifdef CONFIG_X86_32 +#if defined(CONFIG_X86_IOPORT) && defined(CONFIG_X86_32) unsigned int reg; asm volatile ("pushfl;" @@ -856,6 +868,7 @@ static inline void spin_lock_prefetch(const void *x) #define STACK_TOP TASK_SIZE #define STACK_TOP_MAX STACK_TOP +#ifdef CONFIG_X86_IOPORT #define INIT_THREAD_IO .io_bitmap_ptr = NULL, /* @@ -865,6 +878,10 @@ static inline void spin_lock_prefetch(const void *x) * be within the limit. */ #define INIT_TSS_IO .io_bitmap = { [0 ... IO_BITMAP_LONGS] = ~0 }, +...

This patch series makes it possible to compile out the userspace IO system calls, iopl and ioperm. The first patch does some 32/64 unification in copy_thread to make subsequent changes easier. The second patch simplifies the complex calculation of the TSS segment limit, which also makes it easier to change in the last patch. Patches 3-9 introduce helpers to make it easier to compile out IO.

This patch series makes it possible to compile out the userspace IO system calls, iopl and ioperm. The first patch does some 32/64 unification in copy_thread to make subsequent changes easier. The second patch simplifies the complex calculation of the TSS segment limit, which also makes it easier to change in the last patch. Patches 3-9 introduce helpers to make it easier to compile out IO.

...signed mask) : "i" (~X86_EFLAGS_IOPL), "r" (mask)); #endif } +#endif /* CONFIG_X86_IOPORT */ static inline void native_load_sp0(struct tss_struct *tss, struct thread_struct *thread) @@ -828,12 +856,8 @@ static inline void spin_lock_prefetch(const void *x) #define STACK_TOP TASK_SIZE #define STACK_TOP_MAX STACK_TOP -#define INIT_THREAD { \ - .sp0 = sizeof(init_stack) + (long)&init_stack, \ - .vm86_info = NULL, \ - .sysenter_cs = __KERNEL_CS, \ - .io_bitmap_ptr = NULL, \ -} +#ifdef CONFIG_X86_IOPORT +#define INIT_THREAD_IO .io_bi...

...signed mask) : "i" (~X86_EFLAGS_IOPL), "r" (mask)); #endif } +#endif /* CONFIG_X86_IOPORT */ static inline void native_load_sp0(struct tss_struct *tss, struct thread_struct *thread) @@ -832,12 +860,8 @@ static inline void spin_lock_prefetch(const void *x) #define STACK_TOP TASK_SIZE #define STACK_TOP_MAX STACK_TOP -#define INIT_THREAD { \ - .sp0 = sizeof(init_stack) + (long)&init_stack, \ - .vm86_info = NULL, \ - .sysenter_cs = __KERNEL_CS, \ - .io_bitmap_ptr = NULL, \ -} +#ifdef CONFIG_X86_IOPORT +#define INIT_THREAD_IO .io_bi...

...(~X86_EFLAGS_IOPL), "r" (mask)); > #endif > } > +#endif /* CONFIG_X86_IOPORT */ > > static inline void > native_load_sp0(struct tss_struct *tss, struct thread_struct *thread) > @@ -828,12 +856,8 @@ static inline void spin_lock_prefetch(const void *x) > #define STACK_TOP TASK_SIZE > #define STACK_TOP_MAX STACK_TOP > > -#define INIT_THREAD { \ > - .sp0 = sizeof(init_stack) + (long)&init_stack, \ > - .vm86_info = NULL,...

...(~X86_EFLAGS_IOPL), "r" (mask)); > #endif > } > +#endif /* CONFIG_X86_IOPORT */ > > static inline void > native_load_sp0(struct tss_struct *tss, struct thread_struct *thread) > @@ -828,12 +856,8 @@ static inline void spin_lock_prefetch(const void *x) > #define STACK_TOP TASK_SIZE > #define STACK_TOP_MAX STACK_TOP > > -#define INIT_THREAD { \ > - .sp0 = sizeof(init_stack) + (long)&init_stack, \ > - .vm86_info = NULL,...

The 32-bit and 64-bit versions of copy_thread have functionally identical handling for copying the I/O bitmap, modulo differences in error handling. Clean up the error paths in both by moving the copy of the I/O bitmap to the end, to eliminate the need to free it if subsequent copy steps fail; move the resulting identical code to a static inline in a common header. Signed-off-by: Josh Triplett

The 32-bit and 64-bit versions of copy_thread have functionally identical handling for copying the I/O bitmap, modulo differences in error handling. Clean up the error paths in both by moving the copy of the I/O bitmap to the end, to eliminate the need to free it if subsequent copy steps fail; move the resulting identical code to a static inline in a common header. Signed-off-by: Josh Triplett

...sk(unsigned mask) > { > -#ifdef CONFIG_X86_32 > +#if defined(CONFIG_X86_IOPORT) && defined(CONFIG_X86_32) > unsigned int reg; > > asm volatile ("pushfl;" > @@ -842,12 +868,8 @@ static inline void spin_lock_prefetch(const void *x) > #define STACK_TOP TASK_SIZE > #define STACK_TOP_MAX STACK_TOP > > -#define INIT_THREAD { \ > - .sp0 = sizeof(init_stack) + (long)&init_stack, \ > - .vm86_info = NULL,...

This patch series makes it possible to compile out the iopl and ioperm system calls, which allow privileged processes to request permission to directly poke I/O ports from userspace. Nothing on a modern Linux system uses these calls anymore, and anything new should be using /dev/port instead, or better yet writing a driver. Copying the bloat-o-meter stats from the final patch: 32-bit

This patch series makes it possible to compile out the iopl and ioperm system calls, which allow privileged processes to request permission to directly poke I/O ports from userspace. Nothing on a modern Linux system uses these calls anymore, and anything new should be using /dev/port instead, or better yet writing a driver. Copying the bloat-o-meter stats from the final patch: 32-bit

...ruct { */ static inline void native_set_iopl_mask(unsigned mask) { -#ifdef CONFIG_X86_32 +#if defined(CONFIG_X86_IOPORT) && defined(CONFIG_X86_32) unsigned int reg; asm volatile ("pushfl;" @@ -842,12 +868,8 @@ static inline void spin_lock_prefetch(const void *x) #define STACK_TOP TASK_SIZE #define STACK_TOP_MAX STACK_TOP -#define INIT_THREAD { \ - .sp0 = sizeof(init_stack) + (long)&init_stack, \ - .vm86_info = NULL, \ - .sysenter_cs = __KERNEL_CS, \ - .io_bitmap_ptr = NULL, \ -} +#ifdef CONFIG_X86_IOPORT +#define INIT_THREAD_IO .io_bi...

...ruct { */ static inline void native_set_iopl_mask(unsigned mask) { -#ifdef CONFIG_X86_32 +#if defined(CONFIG_X86_IOPORT) && defined(CONFIG_X86_32) unsigned int reg; asm volatile ("pushfl;" @@ -842,12 +868,8 @@ static inline void spin_lock_prefetch(const void *x) #define STACK_TOP TASK_SIZE #define STACK_TOP_MAX STACK_TOP -#define INIT_THREAD { \ - .sp0 = sizeof(init_stack) + (long)&init_stack, \ - .vm86_info = NULL, \ - .sysenter_cs = __KERNEL_CS, \ - .io_bitmap_ptr = NULL, \ -} +#ifdef CONFIG_X86_IOPORT +#define INIT_THREAD_IO .io_bi...

...X86_EFLAGS_IOPL), "r" (mask)); > #endif > } > +#endif /* CONFIG_X86_IOPORT */ > > static inline void > native_load_sp0(struct tss_struct *tss, struct thread_struct *thread) > @@ -828,12 +856,8 @@ static inline void spin_lock_prefetch(const void *x) > #define STACK_TOP TASK_SIZE > #define STACK_TOP_MAX STACK_TOP > > -#define INIT_THREAD { \ > - .sp0 = sizeof(init_stack) + (long)&init_stack, \ > - .vm86_info = NULL, \ > - .sysenter_cs = __KERNEL_CS, \ > - .io_bitmap_ptr = NULL, \ > -} > +#ifdef CON...

...X86_EFLAGS_IOPL), "r" (mask)); > #endif > } > +#endif /* CONFIG_X86_IOPORT */ > > static inline void > native_load_sp0(struct tss_struct *tss, struct thread_struct *thread) > @@ -828,12 +856,8 @@ static inline void spin_lock_prefetch(const void *x) > #define STACK_TOP TASK_SIZE > #define STACK_TOP_MAX STACK_TOP > > -#define INIT_THREAD { \ > - .sp0 = sizeof(init_stack) + (long)&init_stack, \ > - .vm86_info = NULL, \ > - .sysenter_cs = __KERNEL_CS, \ > - .io_bitmap_ptr = NULL, \ > -} > +#ifdef CON...