diff options
Diffstat (limited to 'arm-unknown-riscos/recipes/patches/gcc4/unixlib-ldrex-strex.p')
| -rw-r--r-- | arm-unknown-riscos/recipes/patches/gcc4/unixlib-ldrex-strex.p | 304 |
1 files changed, 0 insertions, 304 deletions
diff --git a/arm-unknown-riscos/recipes/patches/gcc4/unixlib-ldrex-strex.p b/arm-unknown-riscos/recipes/patches/gcc4/unixlib-ldrex-strex.p deleted file mode 100644 index 045a0b8..0000000 --- a/arm-unknown-riscos/recipes/patches/gcc4/unixlib-ldrex-strex.p +++ /dev/null @@ -1,304 +0,0 @@ -Backport r7043 from upstream: partially replaces use of SWP with LDREX/STREX -on systems where SWP is no longer available. This fix is incomplete, -but sufficient for our purposes. - -Fri Mar 11 14:51:54 GMT 2016 Lee Noar <leenoar@sky.com> - - * sys/_cpucaps.s: New file. Provide functions to probe the - OS for details of the CPU (currently SWP, LDREX/STREX - availability). - * Makefile.am: Add above file. - * include/unixlib/local.h: Add declarations for user facing - functions provided above. - * incl-local/internal/asm_dec.s(__ul_global): Add entry to - record CPU flags. - * incl-local/internal/unix.h: Likewise. - * pthread/_ints.s(__pthread_disable_ints,__pthread_protect_unsafe): - Use CPU flags to determine whether to use the SWP instruction or - LRDEX/STREX. - * sys/_syslib.s(__main): Add call to __probe_cpu_caps. - (__unixlib_fatal): Use CPU flags to determine whether to use the - SWP instruction or LRDEX/STREX. - - -Index: gcc4/recipe/files/gcc/libunixlib/pthread/_ints.s -=================================================================== ---- gcc4/recipe/files/gcc/libunixlib/pthread/_ints.s (revision 7042) -+++ gcc4/recipe/files/gcc/libunixlib/pthread/_ints.s (revision 7043) -@@ -2,7 +2,7 @@ - @ disable_ints can be called multiple times, provided enable_ints is - @ subsequently called an equal number of times - @ Written by Martin Piper and Alex Waugh --@ Copyright (c) 2002-2008 UnixLib Developers -+@ Copyright (c) 2002-2016 UnixLib Developers - - #include "internal/asm_dec.s" - -@@ -20,15 +20,26 @@ - PICEQ "LDR a2, [a2, #0]" - PICEQ "LDR a2, [a2, #__GOTT_INDEX__]" @ a2 = GOT ptr - -- LDR a1, .L0 @=__ul_global -+ LDR a1, .L0 @ =__ul_global - PICEQ "LDR a1, [a2, a1]" -+ LDR a4, [a1, #GBL_CPU_FLAGS] - ADD a1, a1, #GBL_PTH_WORKSEMAPHORE -+ TST a4, #__CPUCAP_HAVE_SWP -+ @ From this point onwards we will not be interrupted by the callback -+ BEQ 0f -+ - MOV a3, #1 - SWP a2, a3, [a1] -- @ From this point onwards we will not be interrupted by the callback - ADD a2, a2, #1 - STR a2, [a1] - MOV pc, lr -+0: -+ LDREX a2, [a1] -+ ADD a2, a2, #1 -+ STREX a3, a2, [a1] -+ TEQ a3, #1 -+ BEQ 0b -+ MOV pc, lr - .L0: - WORD __ul_global - DECLARE_FUNCTION __pthread_disable_ints -@@ -78,18 +89,32 @@ - PICEQ "LDR a1, [a1, #0]" - PICEQ "LDR a1, [a1, #__GOTT_INDEX__]" @ a1 = GOT ptr - -- LDR a4, .L2 @=__ul_global -+ LDR a4, .L2 @ =__ul_global - PICEQ "LDR a4, [a1, a4]" -+ LDR a2, [a4, #GBL_CPU_FLAGS] - ADD a1, a4, #GBL_PTH_WORKSEMAPHORE -+ TST a2, #__CPUCAP_HAVE_SWP -+ @ From this point onwards we cannot be interrupted by the callback -+ BEQ 0f -+ - MOV a2, #1 - SWP a3, a2, [a1] -- @ From this point onwards we cannot be interrupted by the callback - CMP a3, #0 -- STRNE a3, [a1, #0] @ Restore original value -+ BEQ 1f -+ STR a3, [a1, #0] @ Restore original value - @ Return, as if ints are disabled on entry to the - @ calling function then they should not be reenabled - @ until the calling function has returned -+ MOV pc, lr -+0: -+ LDREX a3, [a1] -+ MOV ip, #1 -+ STREX a2, ip, [a1] -+ TEQ a2, #1 -+ BEQ 0b -+ TEQ a3, #0 - MOVNE pc, lr -+1: - - #if __UNIXLIB_PARANOID - LDR a3, [a4, #GBL_PTH_RETURN_ADDRESS] -Index: gcc4/recipe/files/gcc/libunixlib/include/unixlib/local.h -=================================================================== ---- gcc4/recipe/files/gcc/libunixlib/include/unixlib/local.h (revision 7042) -+++ gcc4/recipe/files/gcc/libunixlib/include/unixlib/local.h (revision 7043) -@@ -133,6 +133,16 @@ - socket. Is -1 when socket handle is not valid. */ - extern int __get_ro_socket (int __sockfd); - -+/* Return 1 if the SWP instruction is available, otherwise 0. */ -+extern unsigned int __cpucap_have_swp (void); -+ -+/* Return 1 if the LDREX/STREX instructions are available, otherwise 0. */ -+extern unsigned int __cpucap_have_rex (void); -+ -+/* Return 1 if the LDREX/STREX instructions that operate on bytes, half-words -+ and double words are available, otherwise 0. */ -+extern unsigned int __cpucap_have_rexbhd (void); -+ - __END_DECLS - - #endif - * incl-local/internal/asm_dec.s(XSOM_DeregisterClient): Add -Index: gcc4/recipe/files/gcc/libunixlib/Makefile.am -=================================================================== ---- gcc4/recipe/files/gcc/libunixlib/Makefile.am (revision 7042) -+++ gcc4/recipe/files/gcc/libunixlib/Makefile.am (revision 7043) -@@ -1027,6 +1027,7 @@ - sys/sigsetjmp.c \ - sys/stackalloc.c \ - sys/vfork.c \ -+ sys/_cpucaps.s \ - sys/_getcpuarch.s \ - sys/_jmp.s \ - sys/_mman.s \ -Index: gcc4/recipe/files/gcc/libunixlib/incl-local/internal/asm_dec.s -=================================================================== ---- gcc4/recipe/files/gcc/libunixlib/incl-local/internal/asm_dec.s (revision 7042) -+++ gcc4/recipe/files/gcc/libunixlib/incl-local/internal/asm_dec.s (revision 7043) -@@ -269,8 +269,10 @@ - .set GBL_FLS_LBSTM_ON_RD, 108 @ = __ul_global.fls_lbstm_on_rd - .set GBL_PTH_CALLEVERY_RMA, 112 @ = __ul_global.pthread_callevery_rma - -+.set GBL_CPU_FLAGS, 116 @ = __ul_global.cpu_flags -+ - #if !defined(__SOFTFP__) && defined(__VFP_FP__) --.set GBL_VFP_REGCOUNT, 116 @ = __ul_global.vfp_regcount -+.set GBL_VFP_REGCOUNT, 120 @ = __ul_global.vfp_regcount - #endif - - @ Entries in the __ul_memory table. Must be kept in sync with -@@ -322,3 +324,7 @@ - .set CRT1_LIB_FINI, 32 @ Ptr to function to finalise shared libraries - @ at program exit - can be NULL. - #endif -+ -+#define __CPUCAP_HAVE_SWP 0x1 -+#define __CPUCAP_HAVE_REX 0x2 -+#define __CPUCAP_HAVE_REXBHD 0x4 -Index: gcc4/recipe/files/gcc/libunixlib/incl-local/internal/unix.h -=================================================================== ---- gcc4/recipe/files/gcc/libunixlib/incl-local/internal/unix.h (revision 7042) -+++ gcc4/recipe/files/gcc/libunixlib/incl-local/internal/unix.h (revision 7043) -@@ -197,6 +197,8 @@ - the life of the program. This block is passed to the call_every handler in - r12. */ - -+ unsigned int cpu_flags; /* Flags indicating the capabilities of the CPU. */ -+ - #if !defined(__SOFTFP__) && defined(__VFP_FP__) - int vfp_regcount; /* Number of doubleword registers we should request for - VFP contexts */ -Index: gcc4/recipe/files/gcc/libunixlib/sys/_cpucaps.s -=================================================================== ---- gcc4/recipe/files/gcc/libunixlib/sys/_cpucaps.s (revision 0) -+++ gcc4/recipe/files/gcc/libunixlib/sys/_cpucaps.s (revision 7043) -@@ -0,0 +1,91 @@ -+@ Determine the capabilities of the CPU and allow callers to enquire -+@ what they are. -+@ Copyright (c) 2016 UnixLib Developers. -+@ Written by Lee Noar. -+ -+#include "internal/asm_dec.s" -+ -+ .text -+ -+@ Determine what the CPU capabilities are, and record them. -+@ Called early on during program initialisation in _syslib.s. -+ .global __probe_cpu_caps -+ NAME __probe_cpu_caps -+__probe_cpu_caps: -+ MOV r0, #0 -+ SWI XOS_PlatformFeatures -+ MOVVS r0, #0 -+ -+ MOV r2, #0 -+ @ The OS flag is set to 1 to indicate _no_ SWP instruction available (for -+ @ backwards compatibility). We reverse it here and set our flag to 1 to -+ @ indicate that SWP _is_ available. -+ TST r0, #1<<11 @ SWP{B} not available -+ ORREQ r2, r2, #__CPUCAP_HAVE_SWP -+ TST r0, #1<<12 @ LDREX/STREX available -+ ORRNE r2, r2, #__CPUCAP_HAVE_REX -+ TST r0, #1<<13 @ LDREX/STREX{B/H/D} available -+ ORRNE r2, r2, #__CPUCAP_HAVE_REXBHD -+ -+ PICEQ "LDR r0, =__GOTT_BASE__" -+ PICEQ "LDR r0, [r0, #0]" -+ PICEQ "LDR r0, [r0, #__GOTT_INDEX__]" @ r0 = GOT ptr -+ LDR r1, .L0 @ =__ul_global -+ PICEQ "LDR r1, [r0, r1]" -+ STR r2, [r1, #GBL_CPU_FLAGS] -+ -+ MOV pc, lr -+.L0: -+ WORD __ul_global -+ DECLARE_FUNCTION __probe_cpu_caps -+ -+ .global __cpucap_have_swp -+ NAME __cpucap_have_swp -+__cpucap_have_swp: -+ PICEQ "LDR r0, =__GOTT_BASE__" -+ PICEQ "LDR r0, [r0, #0]" -+ PICEQ "LDR r0, [r0, #__GOTT_INDEX__]" @ r0 = GOT ptr -+ LDR r1, .L0 @ =__ul_global -+ PICEQ "LDR r1, [r0, r1]" -+ LDR r0, [r1, #GBL_CPU_FLAGS] -+ TST r0, #__CPUCAP_HAVE_SWP -+ MOVEQ r0, #0 -+ MOVNE r0, #1 -+ -+ MOV pc, lr -+ DECLARE_FUNCTION __cpucap_have_swp -+ -+@ Return 1 if LDREX/STREX instructions are available on the CPU, otherwise 0. -+ .global __cpucap_have_rex -+ NAME __cpucap_have_rex -+__cpucap_have_rex: -+ PICEQ "LDR r0, =__GOTT_BASE__" -+ PICEQ "LDR r0, [r0, #0]" -+ PICEQ "LDR r0, [r0, #__GOTT_INDEX__]" @ r0 = GOT ptr -+ LDR r1, .L0 @ =__ul_global -+ PICEQ "LDR r1, [r0, r1]" -+ LDR r0, [r1, #GBL_CPU_FLAGS] -+ TST r0, #__CPUCAP_HAVE_REX -+ MOVEQ r0, #0 -+ MOVNE r0, #1 -+ -+ MOV pc, lr -+ DECLARE_FUNCTION __cpucap_have_rex -+ -+@ Return 1 if LDREX/STREX instructions that work on non-32 bit data sizes -+@ are available on the CPU, otherwise 0. -+ .global __cpucap_have_rexbhd -+ NAME __cpucap_have_rexbhd -+__cpucap_have_rexbhd: -+ PICEQ "LDR r0, =__GOTT_BASE__" -+ PICEQ "LDR r0, [r0, #0]" -+ PICEQ "LDR r0, [r0, #__GOTT_INDEX__]" @ r0 = GOT ptr -+ LDR r1, .L0 @ =__ul_global -+ PICEQ "LDR r1, [r0, r1]" -+ LDR r0, [r1, #GBL_CPU_FLAGS] -+ TST r0, #__CPUCAP_HAVE_REXBHD -+ MOVEQ r0, #0 -+ MOVNE r0, #1 -+ -+ MOV pc, lr -+ DECLARE_FUNCTION __cpucap_have_rexbhd -Index: gcc4/recipe/files/gcc/libunixlib/sys/_syslib.s -=================================================================== ---- gcc4/recipe/files/gcc/libunixlib/sys/_syslib.s (revision 7042) -+++ gcc4/recipe/files/gcc/libunixlib/sys/_syslib.s (revision 7043) -@@ -255,6 +255,8 @@ - BCC __exit_with_error_num - unknown_cpu_arch: - -+ BL __probe_cpu_caps -+ - @ Use of DAs explicitly overridden if __dynamic_no_da is declared - MOV lr, #-1 - STR lr, [ip, #GBL_DYNAMIC_NUM] -@@ -1286,9 +1288,21 @@ - @ error handling. As last resort to avoid an infinite loop - @ we go for a straight OS_Exit scenario. Anything better we - @ can do ? -+ ADD a3, a4, #GBL_PANIC_MODE -+ LDR a2, [a4, #GBL_CPU_FLAGS] -+ TST a2, #__CPUCAP_HAVE_SWP -+ BEQ 0f -+ - MOV a2, #1 -- ADD a3, a4, #GBL_PANIC_MODE - SWP a2, a2, [a3] -+ B 1f -+0: -+ LDREX a2, [a3] -+ MOV ip, #1 -+ STREX lr, ip, [a3] -+ TEQ lr, #1 -+ BEQ 0b -+1: - TEQ a2, #0 - BEQ __unixlib_fatal_cont1 - |