search for: saved_gs

...linux-2.6.14-zach-work/include/asm-i386/desc.h 2005-11-05 00:28:10.000000000 -0800 @@ -158,6 +158,32 @@ static inline unsigned long get_desc_bas return base; } +struct bios_segment_save { + struct desc_struct save_desc_40; + struct desc_struct *gdt; + unsigned short saved_fs; + unsigned short saved_gs; +}; + +static inline void prepare_bios_segments(struct bios_segment_save *save_area) +{ + int cpu = get_cpu(); + struct desc_struct *gdt = get_cpu_gdt_table(cpu); + save_area->gdt = gdt; + savesegment(fs, save_area->saved_fs); + savesegment(gs, save_area->saved_gs); + save_area->save_d...

...linux-2.6.14-zach-work/include/asm-i386/desc.h 2005-11-05 00:28:10.000000000 -0800 @@ -158,6 +158,32 @@ static inline unsigned long get_desc_bas return base; } +struct bios_segment_save { + struct desc_struct save_desc_40; + struct desc_struct *gdt; + unsigned short saved_fs; + unsigned short saved_gs; +}; + +static inline void prepare_bios_segments(struct bios_segment_save *save_area) +{ + int cpu = get_cpu(); + struct desc_struct *gdt = get_cpu_gdt_table(cpu); + save_area->gdt = gdt; + savesegment(fs, save_area->saved_fs); + savesegment(gs, save_area->saved_gs); + save_area->save_d...

...EG(11) + SAVE_GREG(12) + SAVE_GREG(13) + SAVE_GREG(14) + SAVE_GREG(15) + pushfq; + popq SAVED_GREG(flags) + + mov %cr8, GREG(ax) + mov GREG(ax), REF(saved_cr8) + + RDMSR(MSR_FS_BASE, saved_fs_base) + RDMSR(MSR_GS_BASE, saved_gs_base) + RDMSR(MSR_SHADOW_GS_BASE, saved_kernel_gs_base) + +#else /* !defined(__x86_64__) */ + + pushfl; + popl SAVED_GREG(flags) + +#endif + + mov %ds, REF(saved_ds) + mov %es, REF(saved_es) + mov %fs, REF(saved_fs) + mov %gs, REF(...

...tic inline void init_tss_io(struct tss_struct *t) */ for (i = 0; i <= IO_BITMAP_LONGS; i++) t->io_bitmap[i] = ~0UL; +#else + t->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET; +#endif } /* @@ -524,11 +534,13 @@ struct thread_struct { unsigned int saved_fs; unsigned int saved_gs; #endif +#ifdef CONFIG_X86_IOPORT /* IO permissions: */ unsigned long *io_bitmap_ptr; unsigned long iopl; /* Max allowed port in the bitmap, in bytes: */ unsigned io_bitmap_max; +#endif /* CONFIG_X86_IOPORT */ /* * fpu_counter contains the number of consecutive context switches...

...tic inline void init_tss_io(struct tss_struct *t) */ for (i = 0; i <= IO_BITMAP_LONGS; i++) t->io_bitmap[i] = ~0UL; +#else + t->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET; +#endif } /* @@ -524,11 +534,13 @@ struct thread_struct { unsigned int saved_fs; unsigned int saved_gs; #endif +#ifdef CONFIG_X86_IOPORT /* IO permissions: */ unsigned long *io_bitmap_ptr; unsigned long iopl; /* Max allowed port in the bitmap, in bytes: */ unsigned io_bitmap_max; +#endif /* CONFIG_X86_IOPORT */ /* * fpu_counter contains the number of consecutive context switches...

...TMAP_LONGS; i++) + t->io_bitmap[i] = ~0UL; +#else + t->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET; +#endif +} + /* * Save the original ist values for checking stack pointers during debugging */ @@ -484,13 +508,16 @@ struct thread_struct { unsigned int saved_fs; unsigned int saved_gs; #endif +#ifdef CONFIG_X86_IOPORT /* IO permissions: */ unsigned long *io_bitmap_ptr; unsigned long iopl; /* Max allowed port in the bitmap, in bytes: */ unsigned io_bitmap_max; +#endif /* CONFIG_X86_IOPORT */ }; +#ifdef CONFIG_X86_IOPORT /* * Set IOPL bits in EFLAGS from given...

...TMAP_LONGS; i++) + t->io_bitmap[i] = ~0UL; +#else + t->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET; +#endif +} + /* * Save the original ist values for checking stack pointers during debugging */ @@ -502,11 +526,13 @@ struct thread_struct { unsigned int saved_fs; unsigned int saved_gs; #endif +#ifdef CONFIG_X86_IOPORT /* IO permissions: */ unsigned long *io_bitmap_ptr; unsigned long iopl; /* Max allowed port in the bitmap, in bytes: */ unsigned io_bitmap_max; +#endif /* CONFIG_X86_IOPORT */ /* * fpu_counter contains the number of consecutive context switches...

...ap_base = INVALID_IO_BITMAP_OFFSET; > +#endif > +} > + > /* > * Save the original ist values for checking stack pointers during debugging > */ > @@ -484,13 +508,16 @@ struct thread_struct { > unsigned int saved_fs; > unsigned int saved_gs; > #endif > +#ifdef CONFIG_X86_IOPORT > /* IO permissions: */ > unsigned long *io_bitmap_ptr; > unsigned long iopl; > /* Max allowed port in the bitmap, in bytes: */ > unsigned io_bitmap_max; > +#end...

...ap_base = INVALID_IO_BITMAP_OFFSET; > +#endif > +} > + > /* > * Save the original ist values for checking stack pointers during debugging > */ > @@ -484,13 +508,16 @@ struct thread_struct { > unsigned int saved_fs; > unsigned int saved_gs; > #endif > +#ifdef CONFIG_X86_IOPORT > /* IO permissions: */ > unsigned long *io_bitmap_ptr; > unsigned long iopl; > /* Max allowed port in the bitmap, in bytes: */ > unsigned io_bitmap_max; > +#end...

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

...ap_base = INVALID_IO_BITMAP_OFFSET; > +#endif > +} > + > /* > * Save the original ist values for checking stack pointers during debugging > */ > @@ -510,11 +534,13 @@ struct thread_struct { > unsigned int saved_fs; > unsigned int saved_gs; > #endif > +#ifdef CONFIG_X86_IOPORT > /* IO permissions: */ > unsigned long *io_bitmap_ptr; > unsigned long iopl; > /* Max allowed port in the bitmap, in bytes: */ > unsigned io_bitmap_max; > +#end...

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

...TMAP_LONGS; i++) + t->io_bitmap[i] = ~0UL; +#else + t->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET; +#endif +} + /* * Save the original ist values for checking stack pointers during debugging */ @@ -510,11 +534,13 @@ struct thread_struct { unsigned int saved_fs; unsigned int saved_gs; #endif +#ifdef CONFIG_X86_IOPORT /* IO permissions: */ unsigned long *io_bitmap_ptr; unsigned long iopl; /* Max allowed port in the bitmap, in bytes: */ unsigned io_bitmap_max; +#endif /* CONFIG_X86_IOPORT */ /* * fpu_counter contains the number of consecutive context switches...

...TMAP_LONGS; i++) + t->io_bitmap[i] = ~0UL; +#else + t->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET; +#endif +} + /* * Save the original ist values for checking stack pointers during debugging */ @@ -510,11 +534,13 @@ struct thread_struct { unsigned int saved_fs; unsigned int saved_gs; #endif +#ifdef CONFIG_X86_IOPORT /* IO permissions: */ unsigned long *io_bitmap_ptr; unsigned long iopl; /* Max allowed port in the bitmap, in bytes: */ unsigned io_bitmap_max; +#endif /* CONFIG_X86_IOPORT */ /* * fpu_counter contains the number of consecutive context switches...

...lse > + t->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET; > +#endif > +} > + > /* > * Save the original ist values for checking stack pointers during debugging > */ > @@ -484,13 +508,16 @@ struct thread_struct { > unsigned int saved_fs; > unsigned int saved_gs; > #endif > +#ifdef CONFIG_X86_IOPORT > /* IO permissions: */ > unsigned long *io_bitmap_ptr; > unsigned long iopl; > /* Max allowed port in the bitmap, in bytes: */ > unsigned io_bitmap_max; > +#endif /* CONFIG_X86_IOPORT */ > }; > > +#ifdef CONFIG...

...lse > + t->x86_tss.io_bitmap_base = INVALID_IO_BITMAP_OFFSET; > +#endif > +} > + > /* > * Save the original ist values for checking stack pointers during debugging > */ > @@ -484,13 +508,16 @@ struct thread_struct { > unsigned int saved_fs; > unsigned int saved_gs; > #endif > +#ifdef CONFIG_X86_IOPORT > /* IO permissions: */ > unsigned long *io_bitmap_ptr; > unsigned long iopl; > /* Max allowed port in the bitmap, in bytes: */ > unsigned io_bitmap_max; > +#endif /* CONFIG_X86_IOPORT */ > }; > > +#ifdef CONFIG...

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