diff options
Diffstat (limited to 'arch/powerpc/lib/code-patching.c')
| -rw-r--r-- | arch/powerpc/lib/code-patching.c | 314 |
1 files changed, 186 insertions, 128 deletions
diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c index 3345f039a876..e64546b8875c 100644 --- a/arch/powerpc/lib/code-patching.c +++ b/arch/powerpc/lib/code-patching.c @@ -17,13 +17,19 @@ #include <asm/page.h> #include <asm/code-patching.h> #include <asm/setup.h> +#include <asm/inst.h> -static int __patch_instruction(unsigned int *exec_addr, unsigned int instr, - unsigned int *patch_addr) +static int __patch_instruction(struct ppc_inst *exec_addr, struct ppc_inst instr, + struct ppc_inst *patch_addr) { int err = 0; - __put_user_asm(instr, patch_addr, err, "stw"); + if (!ppc_inst_prefixed(instr)) { + __put_user_asm(ppc_inst_val(instr), patch_addr, err, "stw"); + } else { + __put_user_asm(ppc_inst_as_u64(instr), patch_addr, err, "std"); + } + if (err) return err; @@ -33,7 +39,7 @@ static int __patch_instruction(unsigned int *exec_addr, unsigned int instr, return 0; } -int raw_patch_instruction(unsigned int *addr, unsigned int instr) +int raw_patch_instruction(struct ppc_inst *addr, struct ppc_inst instr) { return __patch_instruction(addr, instr, addr); } @@ -107,13 +113,18 @@ static inline int unmap_patch_area(unsigned long addr) pte_t *ptep; pmd_t *pmdp; pud_t *pudp; + p4d_t *p4dp; pgd_t *pgdp; pgdp = pgd_offset_k(addr); if (unlikely(!pgdp)) return -EINVAL; - pudp = pud_offset(pgdp, addr); + p4dp = p4d_offset(pgdp, addr); + if (unlikely(!p4dp)) + return -EINVAL; + + pudp = pud_offset(p4dp, addr); if (unlikely(!pudp)) return -EINVAL; @@ -136,10 +147,10 @@ static inline int unmap_patch_area(unsigned long addr) return 0; } -static int do_patch_instruction(unsigned int *addr, unsigned int instr) +static int do_patch_instruction(struct ppc_inst *addr, struct ppc_inst instr) { int err; - unsigned int *patch_addr = NULL; + struct ppc_inst *patch_addr = NULL; unsigned long flags; unsigned long text_poke_addr; unsigned long kaddr = (unsigned long)addr; @@ -160,8 +171,7 @@ static int do_patch_instruction(unsigned int *addr, unsigned int instr) goto out; } - patch_addr = (unsigned int *)(text_poke_addr) + - ((kaddr & ~PAGE_MASK) / sizeof(unsigned int)); + patch_addr = (struct ppc_inst *)(text_poke_addr + (kaddr & ~PAGE_MASK)); __patch_instruction(addr, instr, patch_addr); @@ -176,14 +186,14 @@ out: } #else /* !CONFIG_STRICT_KERNEL_RWX */ -static int do_patch_instruction(unsigned int *addr, unsigned int instr) +static int do_patch_instruction(struct ppc_inst *addr, struct ppc_inst instr) { return raw_patch_instruction(addr, instr); } #endif /* CONFIG_STRICT_KERNEL_RWX */ -int patch_instruction(unsigned int *addr, unsigned int instr) +int patch_instruction(struct ppc_inst *addr, struct ppc_inst instr) { /* Make sure we aren't patching a freed init section */ if (init_mem_is_free && init_section_contains(addr, 4)) { @@ -194,9 +204,12 @@ int patch_instruction(unsigned int *addr, unsigned int instr) } NOKPROBE_SYMBOL(patch_instruction); -int patch_branch(unsigned int *addr, unsigned long target, int flags) +int patch_branch(struct ppc_inst *addr, unsigned long target, int flags) { - return patch_instruction(addr, create_branch(addr, target, flags)); + struct ppc_inst instr; + + create_branch(&instr, addr, target, flags); + return patch_instruction(addr, instr); } bool is_offset_in_branch_range(long offset) @@ -225,14 +238,14 @@ bool is_offset_in_branch_range(long offset) * Helper to check if a given instruction is a conditional branch * Derived from the conditional checks in analyse_instr() */ -bool is_conditional_branch(unsigned int instr) +bool is_conditional_branch(struct ppc_inst instr) { - unsigned int opcode = instr >> 26; + unsigned int opcode = ppc_inst_primary_opcode(instr); if (opcode == 16) /* bc, bca, bcl, bcla */ return true; if (opcode == 19) { - switch ((instr >> 1) & 0x3ff) { + switch ((ppc_inst_val(instr) >> 1) & 0x3ff) { case 16: /* bclr, bclrl */ case 528: /* bcctr, bcctrl */ case 560: /* bctar, bctarl */ @@ -243,30 +256,30 @@ bool is_conditional_branch(unsigned int instr) } NOKPROBE_SYMBOL(is_conditional_branch); -unsigned int create_branch(const unsigned int *addr, - unsigned long target, int flags) +int create_branch(struct ppc_inst *instr, + const struct ppc_inst *addr, + unsigned long target, int flags) { - unsigned int instruction; long offset; + *instr = ppc_inst(0); offset = target; if (! (flags & BRANCH_ABSOLUTE)) offset = offset - (unsigned long)addr; /* Check we can represent the target in the instruction format */ if (!is_offset_in_branch_range(offset)) - return 0; + return 1; /* Mask out the flags and target, so they don't step on each other. */ - instruction = 0x48000000 | (flags & 0x3) | (offset & 0x03FFFFFC); + *instr = ppc_inst(0x48000000 | (flags & 0x3) | (offset & 0x03FFFFFC)); - return instruction; + return 0; } -unsigned int create_cond_branch(const unsigned int *addr, - unsigned long target, int flags) +int create_cond_branch(struct ppc_inst *instr, const struct ppc_inst *addr, + unsigned long target, int flags) { - unsigned int instruction; long offset; offset = target; @@ -275,104 +288,107 @@ unsigned int create_cond_branch(const unsigned int *addr, /* Check we can represent the target in the instruction format */ if (offset < -0x8000 || offset > 0x7FFF || offset & 0x3) - return 0; + return 1; /* Mask out the flags and target, so they don't step on each other. */ - instruction = 0x40000000 | (flags & 0x3FF0003) | (offset & 0xFFFC); + *instr = ppc_inst(0x40000000 | (flags & 0x3FF0003) | (offset & 0xFFFC)); - return instruction; + return 0; } -static unsigned int branch_opcode(unsigned int instr) +static unsigned int branch_opcode(struct ppc_inst instr) { - return (instr >> 26) & 0x3F; + return ppc_inst_primary_opcode(instr) & 0x3F; } -static int instr_is_branch_iform(unsigned int instr) +static int instr_is_branch_iform(struct ppc_inst instr) { return branch_opcode(instr) == 18; } -static int instr_is_branch_bform(unsigned int instr) +static int instr_is_branch_bform(struct ppc_inst instr) { return branch_opcode(instr) == 16; } -int instr_is_relative_branch(unsigned int instr) +int instr_is_relative_branch(struct ppc_inst instr) { - if (instr & BRANCH_ABSOLUTE) + if (ppc_inst_val(instr) & BRANCH_ABSOLUTE) return 0; return instr_is_branch_iform(instr) || instr_is_branch_bform(instr); } -int instr_is_relative_link_branch(unsigned int instr) +int instr_is_relative_link_branch(struct ppc_inst instr) { - return instr_is_relative_branch(instr) && (instr & BRANCH_SET_LINK); + return instr_is_relative_branch(instr) && (ppc_inst_val(instr) & BRANCH_SET_LINK); } -static unsigned long branch_iform_target(const unsigned int *instr) +static unsigned long branch_iform_target(const struct ppc_inst *instr) { signed long imm; - imm = *instr & 0x3FFFFFC; + imm = ppc_inst_val(*instr) & 0x3FFFFFC; /* If the top bit of the immediate value is set this is negative */ if (imm & 0x2000000) imm -= 0x4000000; - if ((*instr & BRANCH_ABSOLUTE) == 0) + if ((ppc_inst_val(*instr) & BRANCH_ABSOLUTE) == 0) imm += (unsigned long)instr; return (unsigned long)imm; } -static unsigned long branch_bform_target(const unsigned int *instr) +static unsigned long branch_bform_target(const struct ppc_inst *instr) { signed long imm; - imm = *instr & 0xFFFC; + imm = ppc_inst_val(*instr) & 0xFFFC; /* If the top bit of the immediate value is set this is negative */ if (imm & 0x8000) imm -= 0x10000; - if ((*instr & BRANCH_ABSOLUTE) == 0) + if ((ppc_inst_val(*instr) & BRANCH_ABSOLUTE) == 0) imm += (unsigned long)instr; return (unsigned long)imm; } -unsigned long branch_target(const unsigned int *instr) +unsigned long branch_target(const struct ppc_inst *instr) { - if (instr_is_branch_iform(*instr)) + if (instr_is_branch_iform(ppc_inst_read(instr))) return branch_iform_target(instr); - else if (instr_is_branch_bform(*instr)) + else if (instr_is_branch_bform(ppc_inst_read(instr))) return branch_bform_target(instr); return 0; } -int instr_is_branch_to_addr(const unsigned int *instr, unsigned long addr) +int instr_is_branch_to_addr(const struct ppc_inst *instr, unsigned long addr) { - if (instr_is_branch_iform(*instr) || instr_is_branch_bform(*instr)) + if (instr_is_branch_iform(ppc_inst_read(instr)) || + instr_is_branch_bform(ppc_inst_read(instr))) return branch_target(instr) == addr; return 0; } -unsigned int translate_branch(const unsigned int *dest, const unsigned int *src) +int translate_branch(struct ppc_inst *instr, const struct ppc_inst *dest, + const struct ppc_inst *src) { unsigned long target; - target = branch_target(src); - if (instr_is_branch_iform(*src)) - return create_branch(dest, target, *src); - else if (instr_is_branch_bform(*src)) - return create_cond_branch(dest, target, *src); + if (instr_is_branch_iform(ppc_inst_read(src))) + return create_branch(instr, dest, target, + ppc_inst_val(ppc_inst_read(src))); + else if (instr_is_branch_bform(ppc_inst_read(src))) + return create_cond_branch(instr, dest, target, + ppc_inst_val(ppc_inst_read(src))); - return 0; + return 1; } #ifdef CONFIG_PPC_BOOK3E_64 @@ -387,7 +403,7 @@ void __patch_exception(int exc, unsigned long addr) * instruction of the exception, not the first one */ - patch_branch(ibase + (exc / 4) + 1, addr, 0); + patch_branch((struct ppc_inst *)(ibase + (exc / 4) + 1), addr, 0); } #endif @@ -403,165 +419,171 @@ static void __init test_trampoline(void) static void __init test_branch_iform(void) { - unsigned int instr; + int err; + struct ppc_inst instr; unsigned long addr; addr = (unsigned long)&instr; /* The simplest case, branch to self, no flags */ - check(instr_is_branch_iform(0x48000000)); + check(instr_is_branch_iform(ppc_inst(0x48000000))); /* All bits of target set, and flags */ - check(instr_is_branch_iform(0x4bffffff)); + check(instr_is_branch_iform(ppc_inst(0x4bffffff))); /* High bit of opcode set, which is wrong */ - check(!instr_is_branch_iform(0xcbffffff)); + check(!instr_is_branch_iform(ppc_inst(0xcbffffff))); /* Middle bits of opcode set, which is wrong */ - check(!instr_is_branch_iform(0x7bffffff)); + check(!instr_is_branch_iform(ppc_inst(0x7bffffff))); /* Simplest case, branch to self with link */ - check(instr_is_branch_iform(0x48000001)); + check(instr_is_branch_iform(ppc_inst(0x48000001))); /* All bits of targets set */ - check(instr_is_branch_iform(0x4bfffffd)); + check(instr_is_branch_iform(ppc_inst(0x4bfffffd))); /* Some bits of targets set */ - check(instr_is_branch_iform(0x4bff00fd)); + check(instr_is_branch_iform(ppc_inst(0x4bff00fd))); /* Must be a valid branch to start with */ - check(!instr_is_branch_iform(0x7bfffffd)); + check(!instr_is_branch_iform(ppc_inst(0x7bfffffd))); /* Absolute branch to 0x100 */ - instr = 0x48000103; + instr = ppc_inst(0x48000103); check(instr_is_branch_to_addr(&instr, 0x100)); /* Absolute branch to 0x420fc */ - instr = 0x480420ff; + instr = ppc_inst(0x480420ff); check(instr_is_branch_to_addr(&instr, 0x420fc)); /* Maximum positive relative branch, + 20MB - 4B */ - instr = 0x49fffffc; + instr = ppc_inst(0x49fffffc); check(instr_is_branch_to_addr(&instr, addr + 0x1FFFFFC)); /* Smallest negative relative branch, - 4B */ - instr = 0x4bfffffc; + instr = ppc_inst(0x4bfffffc); check(instr_is_branch_to_addr(&instr, addr - 4)); /* Largest negative relative branch, - 32 MB */ - instr = 0x4a000000; + instr = ppc_inst(0x4a000000); check(instr_is_branch_to_addr(&instr, addr - 0x2000000)); /* Branch to self, with link */ - instr = create_branch(&instr, addr, BRANCH_SET_LINK); + err = create_branch(&instr, &instr, addr, BRANCH_SET_LINK); check(instr_is_branch_to_addr(&instr, addr)); /* Branch to self - 0x100, with link */ - instr = create_branch(&instr, addr - 0x100, BRANCH_SET_LINK); + err = create_branch(&instr, &instr, addr - 0x100, BRANCH_SET_LINK); check(instr_is_branch_to_addr(&instr, addr - 0x100)); /* Branch to self + 0x100, no link */ - instr = create_branch(&instr, addr + 0x100, 0); + err = create_branch(&instr, &instr, addr + 0x100, 0); check(instr_is_branch_to_addr(&instr, addr + 0x100)); /* Maximum relative negative offset, - 32 MB */ - instr = create_branch(&instr, addr - 0x2000000, BRANCH_SET_LINK); + err = create_branch(&instr, &instr, addr - 0x2000000, BRANCH_SET_LINK); check(instr_is_branch_to_addr(&instr, addr - 0x2000000)); /* Out of range relative negative offset, - 32 MB + 4*/ - instr = create_branch(&instr, addr - 0x2000004, BRANCH_SET_LINK); - check(instr == 0); + err = create_branch(&instr, &instr, addr - 0x2000004, BRANCH_SET_LINK); + check(err); /* Out of range relative positive offset, + 32 MB */ - instr = create_branch(&instr, addr + 0x2000000, BRANCH_SET_LINK); - check(instr == 0); + err = create_branch(&instr, &instr, addr + 0x2000000, BRANCH_SET_LINK); + check(err); /* Unaligned target */ - instr = create_branch(&instr, addr + 3, BRANCH_SET_LINK); - check(instr == 0); + err = create_branch(&instr, &instr, addr + 3, BRANCH_SET_LINK); + check(err); /* Check flags are masked correctly */ - instr = create_branch(&instr, addr, 0xFFFFFFFC); + err = create_branch(&instr, &instr, addr, 0xFFFFFFFC); check(instr_is_branch_to_addr(&instr, addr)); - check(instr == 0x48000000); + check(ppc_inst_equal(instr, ppc_inst(0x48000000))); } static void __init test_create_function_call(void) { - unsigned int *iptr; + struct ppc_inst *iptr; unsigned long dest; + struct ppc_inst instr; /* Check we can create a function call */ - iptr = (unsigned int *)ppc_function_entry(test_trampoline); + iptr = (struct ppc_inst *)ppc_function_entry(test_trampoline); dest = ppc_function_entry(test_create_function_call); - patch_instruction(iptr, create_branch(iptr, dest, BRANCH_SET_LINK)); + create_branch(&instr, iptr, dest, BRANCH_SET_LINK); + patch_instruction(iptr, instr); check(instr_is_branch_to_addr(iptr, dest)); } static void __init test_branch_bform(void) { + int err; unsigned long addr; - unsigned int *iptr, instr, flags; + struct ppc_inst *iptr, instr; + unsigned int flags; iptr = &instr; addr = (unsigned long)iptr; /* The simplest case, branch to self, no flags */ - check(instr_is_branch_bform(0x40000000)); + check(instr_is_branch_bform(ppc_inst(0x40000000))); /* All bits of target set, and flags */ - check(instr_is_branch_bform(0x43ffffff)); + check(instr_is_branch_bform(ppc_inst(0x43ffffff))); /* High bit of opcode set, which is wrong */ - check(!instr_is_branch_bform(0xc3ffffff)); + check(!instr_is_branch_bform(ppc_inst(0xc3ffffff))); /* Middle bits of opcode set, which is wrong */ - check(!instr_is_branch_bform(0x7bffffff)); + check(!instr_is_branch_bform(ppc_inst(0x7bffffff))); /* Absolute conditional branch to 0x100 */ - instr = 0x43ff0103; + instr = ppc_inst(0x43ff0103); check(instr_is_branch_to_addr(&instr, 0x100)); /* Absolute conditional branch to 0x20fc */ - instr = 0x43ff20ff; + instr = ppc_inst(0x43ff20ff); check(instr_is_branch_to_addr(&instr, 0x20fc)); /* Maximum positive relative conditional branch, + 32 KB - 4B */ - instr = 0x43ff7ffc; + instr = ppc_inst(0x43ff7ffc); check(instr_is_branch_to_addr(&instr, addr + 0x7FFC)); /* Smallest negative relative conditional branch, - 4B */ - instr = 0x43fffffc; + instr = ppc_inst(0x43fffffc); check(instr_is_branch_to_addr(&instr, addr - 4)); /* Largest negative relative conditional branch, - 32 KB */ - instr = 0x43ff8000; + instr = ppc_inst(0x43ff8000); check(instr_is_branch_to_addr(&instr, addr - 0x8000)); /* All condition code bits set & link */ flags = 0x3ff000 | BRANCH_SET_LINK; /* Branch to self */ - instr = create_cond_branch(iptr, addr, flags); + err = create_cond_branch(&instr, iptr, addr, flags); check(instr_is_branch_to_addr(&instr, addr)); /* Branch to self - 0x100 */ - instr = create_cond_branch(iptr, addr - 0x100, flags); + err = create_cond_branch(&instr, iptr, addr - 0x100, flags); check(instr_is_branch_to_addr(&instr, addr - 0x100)); /* Branch to self + 0x100 */ - instr = create_cond_branch(iptr, addr + 0x100, flags); + err = create_cond_branch(&instr, iptr, addr + 0x100, flags); check(instr_is_branch_to_addr(&instr, addr + 0x100)); /* Maximum relative negative offset, - 32 KB */ - instr = create_cond_branch(iptr, addr - 0x8000, flags); + err = create_cond_branch(&instr, iptr, addr - 0x8000, flags); check(instr_is_branch_to_addr(&instr, addr - 0x8000)); /* Out of range relative negative offset, - 32 KB + 4*/ - instr = create_cond_branch(iptr, addr - 0x8004, flags); - check(instr == 0); + err = create_cond_branch(&instr, iptr, addr - 0x8004, flags); + check(err); /* Out of range relative positive offset, + 32 KB */ - instr = create_cond_branch(iptr, addr + 0x8000, flags); - check(instr == 0); + err = create_cond_branch(&instr, iptr, addr + 0x8000, flags); + check(err); /* Unaligned target */ - instr = create_cond_branch(iptr, addr + 3, flags); - check(instr == 0); + err = create_cond_branch(&instr, iptr, addr + 3, flags); + check(err); /* Check flags are masked correctly */ - instr = create_cond_branch(iptr, addr, 0xFFFFFFFC); + err = create_cond_branch(&instr, iptr, addr, 0xFFFFFFFC); check(instr_is_branch_to_addr(&instr, addr)); - check(instr == 0x43FF0000); + check(ppc_inst_equal(instr, ppc_inst(0x43FF0000))); } static void __init test_translate_branch(void) { unsigned long addr; - unsigned int *p, *q; + void *p, *q; + struct ppc_inst instr; void *buf; buf = vmalloc(PAGE_ALIGN(0x2000000 + 1)); @@ -574,8 +596,9 @@ static void __init test_translate_branch(void) addr = (unsigned long)p; patch_branch(p, addr, 0); check(instr_is_branch_to_addr(p, addr)); - q = p + 1; - patch_instruction(q, translate_branch(q, p)); + q = p + 4; + translate_branch(&instr, q, p); + patch_instruction(q, instr); check(instr_is_branch_to_addr(q, addr)); /* Maximum negative case, move b . to addr + 32 MB */ @@ -583,27 +606,30 @@ static void __init test_translate_branch(void) addr = (unsigned long)p; patch_branch(p, addr, 0); q = buf + 0x2000000; - patch_instruction(q, translate_branch(q, p)); + translate_branch(&instr, q, p); + patch_instruction(q, instr); check(instr_is_branch_to_addr(p, addr)); check(instr_is_branch_to_addr(q, addr)); - check(*q == 0x4a000000); + check(ppc_inst_equal(ppc_inst_read(q), ppc_inst(0x4a000000))); /* Maximum positive case, move x to x - 32 MB + 4 */ p = buf + 0x2000000; addr = (unsigned long)p; patch_branch(p, addr, 0); q = buf + 4; - patch_instruction(q, translate_branch(q, p)); + translate_branch(&instr, q, p); + patch_instruction(q, instr); check(instr_is_branch_to_addr(p, addr)); check(instr_is_branch_to_addr(q, addr)); - check(*q == 0x49fffffc); + check(ppc_inst_equal(ppc_inst_read(q), ppc_inst(0x49fffffc))); /* Jump to x + 16 MB moved to x + 20 MB */ p = buf; addr = 0x1000000 + (unsigned long)buf; patch_branch(p, addr, BRANCH_SET_LINK); q = buf + 0x1400000; - patch_instruction(q, translate_branch(q, p)); + translate_branch(&instr, q, p); + patch_instruction(q, instr); check(instr_is_branch_to_addr(p, addr)); check(instr_is_branch_to_addr(q, addr)); @@ -612,7 +638,8 @@ static void __init test_translate_branch(void) addr = 0x2000000 + (unsigned long)buf; patch_branch(p, addr, 0); q = buf + 4; - patch_instruction(q, translate_branch(q, p)); + translate_branch(&instr, q, p); + patch_instruction(q, instr); check(instr_is_branch_to_addr(p, addr)); check(instr_is_branch_to_addr(q, addr)); @@ -622,47 +649,57 @@ static void __init test_translate_branch(void) /* Simple case, branch to self moved a little */ p = buf; addr = (unsigned long)p; - patch_instruction(p, create_cond_branch(p, addr, 0)); + create_cond_branch(&instr, p, addr, 0); + patch_instruction(p, instr); check(instr_is_branch_to_addr(p, addr)); - q = p + 1; - patch_instruction(q, translate_branch(q, p)); + q = buf + 4; + translate_branch(&instr, q, p); + patch_instruction(q, instr); check(instr_is_branch_to_addr(q, addr)); /* Maximum negative case, move b . to addr + 32 KB */ p = buf; addr = (unsigned long)p; - patch_instruction(p, create_cond_branch(p, addr, 0xFFFFFFFC)); + create_cond_branch(&instr, p, addr, 0xFFFFFFFC); + patch_instruction(p, instr); q = buf + 0x8000; - patch_instruction(q, translate_branch(q, p)); + translate_branch(&instr, q, p); + patch_instruction(q, instr); check(instr_is_branch_to_addr(p, addr)); check(instr_is_branch_to_addr(q, addr)); - check(*q == 0x43ff8000); + check(ppc_inst_equal(ppc_inst_read(q), ppc_inst(0x43ff8000))); /* Maximum positive case, move x to x - 32 KB + 4 */ p = buf + 0x8000; addr = (unsigned long)p; - patch_instruction(p, create_cond_branch(p, addr, 0xFFFFFFFC)); + create_cond_branch(&instr, p, addr, 0xFFFFFFFC); + patch_instruction(p, instr); q = buf + 4; - patch_instruction(q, translate_branch(q, p)); + translate_branch(&instr, q, p); + patch_instruction(q, instr); check(instr_is_branch_to_addr(p, addr)); check(instr_is_branch_to_addr(q, addr)); - check(*q == 0x43ff7ffc); + check(ppc_inst_equal(ppc_inst_read(q), ppc_inst(0x43ff7ffc))); /* Jump to x + 12 KB moved to x + 20 KB */ p = buf; addr = 0x3000 + (unsigned long)buf; - patch_instruction(p, create_cond_branch(p, addr, BRANCH_SET_LINK)); + create_cond_branch(&instr, p, addr, BRANCH_SET_LINK); + patch_instruction(p, instr); q = buf + 0x5000; - patch_instruction(q, translate_branch(q, p)); + translate_branch(&instr, q, p); + patch_instruction(q, instr); check(instr_is_branch_to_addr(p, addr)); check(instr_is_branch_to_addr(q, addr)); /* Jump to x + 8 KB moved to x - 8 KB + 4 */ p = buf + 0x2000; addr = 0x4000 + (unsigned long)buf; - patch_instruction(p, create_cond_branch(p, addr, 0)); + create_cond_branch(&instr, p, addr, 0); + patch_instruction(p, instr); q = buf + 4; - patch_instruction(q, translate_branch(q, p)); + translate_branch(&instr, q, p); + patch_instruction(q, instr); check(instr_is_branch_to_addr(p, addr)); check(instr_is_branch_to_addr(q, addr)); @@ -670,6 +707,26 @@ static void __init test_translate_branch(void) vfree(buf); } +#ifdef CONFIG_PPC64 +static void __init test_prefixed_patching(void) +{ + extern unsigned int code_patching_test1[]; + extern unsigned int code_patching_test1_expected[]; + extern unsigned int end_code_patching_test1[]; + + __patch_instruction((struct ppc_inst *)code_patching_test1, + ppc_inst_prefix(OP_PREFIX << 26, 0x00000000), + (struct ppc_inst *)code_patching_test1); + + check(!memcmp(code_patching_test1, + code_patching_test1_expected, + sizeof(unsigned int) * + (end_code_patching_test1 - code_patching_test1))); +} +#else +static inline void test_prefixed_patching(void) {} +#endif + static int __init test_code_patching(void) { printk(KERN_DEBUG "Running code patching self-tests ...\n"); @@ -678,6 +735,7 @@ static int __init test_code_patching(void) test_branch_bform(); test_create_function_call(); test_translate_branch(); + test_prefixed_patching(); return 0; } |