diff options
Diffstat (limited to 'recipes/uclibc/uclibc-0.9.28/thumb-call-via-rx.patch')
| -rw-r--r-- | recipes/uclibc/uclibc-0.9.28/thumb-call-via-rx.patch | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/recipes/uclibc/uclibc-0.9.28/thumb-call-via-rx.patch b/recipes/uclibc/uclibc-0.9.28/thumb-call-via-rx.patch new file mode 100644 index 0000000000..eae54f37e5 --- /dev/null +++ b/recipes/uclibc/uclibc-0.9.28/thumb-call-via-rx.patch @@ -0,0 +1,207 @@ +# Put the call_via_rx code into each executable - call_via_ip cannot +# possibly work if called through the PLT! ldso requires this code +# too as it is not linked with the crt stuff and thumb ldso does +# make calls via a register. +# +# The patch puts the code into crti.S so that it is linked into +# every normally built application (if thumb or interworking is +# selected). This is only 30 extra bytes and it works - the previous +# code did not because nothing both implemented and exported the +# APIs (they were in libgcc, but not in the version script). +# +# crti.S and crtn.S is also brought up to date with GCC 3.4.4 - this +# is essential for thumb support because the .init and .fini sections +# must use arm or thumb code to match the compilation of the libraries. +# +# Note that code which pushes stuff into .init or .fini must be +# compiled with or without -mthumb to match the uclibc compilation - +# and gcc itself (which does do this) must therefore be compiled to +# match. +# +--- uClibc-0.9.28/.pc/thumb-call-via-rx.patch/libc/sysdeps/linux/arm/crti.S 2005-08-17 15:49:41.000000000 -0700 ++++ uClibc-0.9.28/libc/sysdeps/linux/arm/crti.S 2005-09-21 19:15:19.996721584 -0700 +@@ -1,26 +1,86 @@ + .file "initfini.c" + + .section .init +- .align 2 + .global _init + .type _init, %function ++#if defined __thumb__ ++ .align 1 ++ .thumb ++ .thumb_func + _init: +- @ args = 0, pretend = 0, frame = 0 +- @ frame_needed = 0, uses_anonymous_args = 0 +- str lr, [sp, #-4]! +- +- .align 2 +- +- +- .section .fini ++ push {r4-r7, lr} ++#else + .align 2 ++ .arm ++_init: ++ @ gcc 3.3.2 didn't create a stack frame, gcc 3.4.4 does - ++ @ presumably 3.4.4 can put stuff into .init which requires ++ @ the arguments to be saved. This code is copied from 3.4.4 ++ mov ip, sp ++ stmdb sp!, {r4, r5, r6, r7, r8, r9, sl, fp, ip, lr, pc} ++ sub fp, ip, #4 ++#endif ++ ++ ++ .section .fini + .global _fini + .type _fini, %function ++#if defined __thumb__ ++ .align 1 ++ .thumb ++ .thumb_func + _fini: +- @ args = 0, pretend = 0, frame = 0 +- @ frame_needed = 0, uses_anonymous_args = 0 +- str lr, [sp, #-4]! +- .align 2 +- +- ++ push {r4-r7, lr} ++#else ++ .align 2 ++ .arm ++_fini: ++ mov ip, sp ++ stmdb sp!, {r4, r5, r6, r7, r8, r9, sl, fp, ip, lr, pc} ++ sub fp, ip, #4 ++#endif ++ ++ ++#if (defined __thumb__ || defined __THUMB_INTERWORK__) && (defined __ARM_ARCH_4T__ || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__) ++ @ To support thumb code it is currently necessary to have the _call_via_rX ++ @ functions exposed to the linker for any program or shared library. PLT ++ @ references are inadequate - the PLT zaps ip and therefore breaks _call_via_ip ++ @ (and the compiler does generate this). It is simpler to put all the ++ @ required code in here - it only amounts to 60 bytes overhead. ++ @NOTE: it would be better to have the compiler generate this stuff as ++ @ required... ++ .section ".text" ++ .align 0 ++ .force_thumb ++ ++.macro call_via register ++ .global _call_via_\register ++ .type _call_via_\register, %function ++ .weak _call_via_\register ++ .hidden _call_via_\register ++ .thumb_func ++_call_via_\register: ++ bx \register ++ nop ++ .size _call_via_\register, . - _call_via_\register ++.endm ++ ++ @ and calls for the 15 general purpose registers (2 bytes each). ++ call_via r0 ++ call_via r1 ++ call_via r2 ++ call_via r3 ++ call_via r4 ++ call_via r5 ++ call_via r6 ++ call_via r7 ++ call_via r8 ++ call_via r9 ++ call_via sl ++ call_via fp ++ call_via ip ++ call_via sp ++ call_via lr ++#endif ++ + .ident "GCC: (GNU) 3.3.2 20031005 (Debian prerelease)" +--- uClibc-0.9.28/libc/sysdeps/linux/arm/crtn.S.orig 2005-09-20 16:39:20.010925582 -0700 ++++ uClibc-0.9.28/libc/sysdeps/linux/arm/crtn.S 2005-09-20 17:00:51.700206464 -0700 +@@ -1,17 +1,34 @@ + .file "initfini.c" + + .section .init +- .align 2 + .global _init + .type _init, %function +- ldr pc, [sp], #4 ++#if defined __thumb__ ++ .align 1 ++ .thumb ++ @ this will not work on ARMv4T, but lots of stuff ++ @ in here won't work there anyway... ++ pop {r4-r7, pc} ++#else ++ .align 2 ++ .arm ++ ldmdb fp, {r4, r5, r6, r7, r8, r9, sl, fp, sp, pc} ++#endif + .size _init, .-_init + + .section .fini +- .align 2 + .global _fini + .type _fini, %function +- ldr pc, [sp], #4 ++#if defined __thumb__ ++ .align 1 ++ .thumb ++ pop {r4-r7, pc} ++#else ++ .align 2 ++ .arm ++ ldmdb fp, {r4, r5, r6, r7, r8, r9, sl, fp, sp, pc} ++#endif + .size _fini, .-_fini + ++ @ In fact this is modified to 3.4.4 + .ident "GCC: (GNU) 3.3.2 20031005 (Debian prerelease)" +--- uClibc-0.9.28/.pc/thumb-call-via-rx.patch/ldso/ldso/arm/dl-syscalls.h 2005-08-17 15:49:41.000000000 -0700 ++++ uClibc-0.9.28/ldso/ldso/arm/dl-syscalls.h 2005-09-21 19:17:01.143086323 -0700 +@@ -4,3 +4,39 @@ + #define __set_errno(X) {(_dl_errno) = (X);} + #include "sys/syscall.h" + ++/* _call_via_rX calls are used in thumb ldso because of calls via ++ * function pointers, but ldso is not linked with anything which ++ * provides them, so define them here (only required for thumb). ++ */ ++#if defined(__thumb__) ++asm( ++ ".macro call_via register\n" ++ " .global _call_via_\\register\n" ++ " .hidden _call_via_\\register\n" ++ " .type _call_via_\\register, %function\n" ++ " .thumb_func\n" ++ "_call_via_\\register:\n" ++ " bx \\register\n" ++ " .size _call_via_\\register, . - _call_via_\\register\n" ++ ".endm\n" ++ ++ ".text\n" ++ ".thumb\n" ++ ".align 1\n" ++ " call_via r0\n" ++ " call_via r1\n" ++ " call_via r2\n" ++ " call_via r3\n" ++ " call_via r4\n" ++ " call_via r5\n" ++ " call_via r6\n" ++ " call_via r7\n" ++ " call_via r8\n" ++ " call_via r9\n" ++ " call_via r10\n" ++ " call_via r11\n" ++ " call_via r12\n" ++ " call_via r13\n" ++ " call_via r14\n" ++); ++#endif |