diff options
| -rw-r--r-- | include/asm-powerpc/system.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/include/asm-powerpc/system.h b/include/asm-powerpc/system.h index 5b2ecbc4790..b5da0b851e0 100644 --- a/include/asm-powerpc/system.h +++ b/include/asm-powerpc/system.h @@ -359,5 +359,53 @@ extern void reloc_got2(unsigned long); #define PTRRELOC(x) ((typeof(x)) add_reloc_offset((unsigned long)(x))) +static inline void create_instruction(unsigned long addr, unsigned int instr) +{ + unsigned int *p; + p = (unsigned int *)addr; + *p = instr; + asm ("dcbst 0, %0; sync; icbi 0,%0; sync; isync" : : "r" (p)); +} + +/* Flags for create_branch: + * "b" == create_branch(addr, target, 0); + * "ba" == create_branch(addr, target, BRANCH_ABSOLUTE); + * "bl" == create_branch(addr, target, BRANCH_SET_LINK); + * "bla" == create_branch(addr, target, BRANCH_ABSOLUTE | BRANCH_SET_LINK); + */ +#define BRANCH_SET_LINK 0x1 +#define BRANCH_ABSOLUTE 0x2 + +static inline void create_branch(unsigned long addr, + unsigned long target, int flags) +{ + unsigned int instruction; + + if (! (flags & BRANCH_ABSOLUTE)) + target = target - addr; + + /* Mask out the flags and target, so they don't step on each other. */ + instruction = 0x48000000 | (flags & 0x3) | (target & 0x03FFFFFC); + + create_instruction(addr, instruction); +} + +static inline void create_function_call(unsigned long addr, void * func) +{ + unsigned long func_addr; + +#ifdef CONFIG_PPC64 + /* + * On PPC64 the function pointer actually points to the function's + * descriptor. The first entry in the descriptor is the address + * of the function text. + */ + func_addr = *(unsigned long *)func; +#else + func_addr = (unsigned long)func; +#endif + create_branch(addr, func_addr, BRANCH_SET_LINK); +} + #endif /* __KERNEL__ */ #endif /* _ASM_POWERPC_SYSTEM_H */ |