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| author | Catalin Marinas <catalin.marinas@arm.com> | 2009-05-30 14:00:18 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2009-05-30 14:00:18 +0100 |
| commit | 26584853a44c58f3d6ac7360d697a2ddcd1a3efa (patch) | |
| tree | a47156d781c6207d316746a056a81ca82b90d452 /arch/arm/include | |
| parent | ee8c9571191e588ede9a220ded807e33c4897d91 (diff) | |
| download | linux-26584853a44c58f3d6ac7360d697a2ddcd1a3efa.tar.gz linux-26584853a44c58f3d6ac7360d697a2ddcd1a3efa.tar.bz2 linux-26584853a44c58f3d6ac7360d697a2ddcd1a3efa.zip | |
Add core support for ARMv6/v7 big-endian
Starting with ARMv6, the CPUs support the BE-8 variant of big-endian
(byte-invariant). This patch adds the core support:
- setting of the BE-8 mode via the CPSR.E register for both kernel and
user threads
- big-endian page table walking
- REV used to rotate instructions read from memory during fault
processing as they are still little-endian format
- Kconfig and Makefile support for BE-8. The --be8 option must be passed
to the final linking stage to convert the instructions to
little-endian
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm/include')
| -rw-r--r-- | arch/arm/include/asm/processor.h | 1 | ||||
| -rw-r--r-- | arch/arm/include/asm/ptrace.h | 10 |
2 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm/include/asm/processor.h b/arch/arm/include/asm/processor.h index 1845892260e7..6a89567ffc5b 100644 --- a/arch/arm/include/asm/processor.h +++ b/arch/arm/include/asm/processor.h @@ -71,6 +71,7 @@ struct thread_struct { regs->ARM_cpsr = USR26_MODE; \ if (elf_hwcap & HWCAP_THUMB && pc & 1) \ regs->ARM_cpsr |= PSR_T_BIT; \ + regs->ARM_cpsr |= PSR_ENDSTATE; \ regs->ARM_pc = pc & ~1; /* pc */ \ regs->ARM_sp = sp; /* sp */ \ regs->ARM_r2 = stack[2]; /* r2 (envp) */ \ diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h index 4a4290f7b4a2..67b833c9b6b9 100644 --- a/arch/arm/include/asm/ptrace.h +++ b/arch/arm/include/asm/ptrace.h @@ -50,6 +50,7 @@ #define PSR_F_BIT 0x00000040 #define PSR_I_BIT 0x00000080 #define PSR_A_BIT 0x00000100 +#define PSR_E_BIT 0x00000200 #define PSR_J_BIT 0x01000000 #define PSR_Q_BIT 0x08000000 #define PSR_V_BIT 0x10000000 @@ -72,6 +73,15 @@ #define PSR_IT_MASK 0x0600fc00 /* If-Then execution state mask */ #define PSR_ENDIAN_MASK 0x00000200 /* Endianness state mask */ +/* + * Default endianness state + */ +#ifdef CONFIG_CPU_ENDIAN_BE8 +#define PSR_ENDSTATE PSR_E_BIT +#else +#define PSR_ENDSTATE 0 +#endif + #ifndef __ASSEMBLY__ /* |