GitHub-Mirror/linux-bl808
2
0
Fork 0
mirror of https://github.com/Fishwaldo/linux-bl808.git synced 2025-06-17 20:25:19 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

MIPS: Preliminary VDSO

Browse source 
This is a preliminary patch to add a vdso to all user processes.  Still
missing are ELF headers and .eh_frame information.  But it is enough to
allow us to move signal trampolines off of the stack.  Note that emulation
of branch delay slots in the FPU emulator still requires the stack.

We allocate a single page (the vdso) and write all possible signal
trampolines into it.  The stack is moved down by one page and the vdso is
mapped into this space.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/975/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney 2010-02-18 16:13:04 -08:00 • committed by Ralf Baechle
parent 58b9e2239f
commit c52d0d30ae
8 changed files with 165 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

6
arch/mips/kernel/syscall.c
View file

@ -79,7 +79,11 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
int do_color_align;
unsigned long task_size;
task_size = STACK_TOP;
#ifdef CONFIG_32BIT
task_size = TASK_SIZE;
#else /* Must be CONFIG_64BIT*/
task_size = test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE;
#endif
if (len > task_size)
return -ENOMEM;