diff options
Diffstat (limited to 'arch/arm/kernel/sigreturn_codes.S')
| -rw-r--r-- | arch/arm/kernel/sigreturn_codes.S | 56 |
1 files changed, 51 insertions, 5 deletions
diff --git a/arch/arm/kernel/sigreturn_codes.S b/arch/arm/kernel/sigreturn_codes.S index b84d0cb13682..2c7b22e32152 100644 --- a/arch/arm/kernel/sigreturn_codes.S +++ b/arch/arm/kernel/sigreturn_codes.S @@ -14,6 +14,8 @@ * GNU General Public License for more details. */ +#include <asm/assembler.h> +#include <asm/asm-offsets.h> #include <asm/unistd.h> /* @@ -51,6 +53,17 @@ ARM_OK( .arm ) .thumb .endm + .macro arm_fdpic_slot n + .org sigreturn_codes + 24 + 20 * (\n) +ARM_OK( .arm ) + .endm + + .macro thumb_fdpic_slot n + .org sigreturn_codes + 24 + 20 * (\n) + 12 + .thumb + .endm + + #if __LINUX_ARM_ARCH__ <= 4 /* * Note we manually set minimally required arch that supports @@ -90,13 +103,46 @@ ARM_OK( swi #(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE) ) movs r7, #(__NR_rt_sigreturn - __NR_SYSCALL_BASE) swi #0 + /* ARM sigreturn restorer FDPIC bounce code snippet */ + arm_fdpic_slot 0 +ARM_OK( ldr r3, [sp, #SIGFRAME_RC3_OFFSET] ) +ARM_OK( ldmia r3, {r3, r9} ) +#ifdef CONFIG_ARM_THUMB +ARM_OK( bx r3 ) +#else +ARM_OK( ret r3 ) +#endif + + /* Thumb sigreturn restorer FDPIC bounce code snippet */ + thumb_fdpic_slot 0 + ldr r3, [sp, #SIGFRAME_RC3_OFFSET] + ldmia r3, {r2, r3} + mov r9, r3 + bx r2 + + /* ARM sigreturn_rt restorer FDPIC bounce code snippet */ + arm_fdpic_slot 1 +ARM_OK( ldr r3, [sp, #RT_SIGFRAME_RC3_OFFSET] ) +ARM_OK( ldmia r3, {r3, r9} ) +#ifdef CONFIG_ARM_THUMB +ARM_OK( bx r3 ) +#else +ARM_OK( ret r3 ) +#endif + + /* Thumb sigreturn_rt restorer FDPIC bounce code snippet */ + thumb_fdpic_slot 1 + ldr r3, [sp, #RT_SIGFRAME_RC3_OFFSET] + ldmia r3, {r2, r3} + mov r9, r3 + bx r2 + /* - * Note on addtional space: setup_return in signal.c - * algorithm uses two words copy regardless whether - * it is thumb case or not, so we need additional - * word after real last entry. + * Note on additional space: setup_return in signal.c + * always copies the same number of words regardless whether + * it is thumb case or not, so we need one additional padding + * word after the last entry. */ - arm_slot 2 .space 4 .size sigreturn_codes, . - sigreturn_codes |