[PATCH v8 10/30] powerpc: Introduce functions for instruction equality
From: Jordan Niethe <hidden>
Date: 2020-05-06 04:03:12
Subsystem:
function hooks (ftrace), linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Steven Rostedt, Masami Hiramatsu, Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
In preparation for an instruction data type that can not be directly
used with the '==' operator use functions for checking equality.
Reviewed-by: Balamuruhan S <redacted>
Signed-off-by: Jordan Niethe <redacted>
---
v5: Remove ppc_inst_null()
v7: Fix compilation issue in expected_nop_sequence() when no
CONFIG_MPROFILE_KERNEL
---
arch/powerpc/include/asm/inst.h | 5 +++++
arch/powerpc/kernel/trace/ftrace.c | 15 ++++++++-------
arch/powerpc/lib/code-patching.c | 12 ++++++------
arch/powerpc/xmon/xmon.c | 4 ++--
4 files changed, 21 insertions(+), 15 deletions(-)
diff --git a/arch/powerpc/include/asm/inst.h b/arch/powerpc/include/asm/inst.h
index 23fd57a86b03..0c5dc539160a 100644
--- a/arch/powerpc/include/asm/inst.h
+++ b/arch/powerpc/include/asm/inst.h@@ -23,4 +23,9 @@ static inline u32 ppc_inst_swab(u32 x) return ppc_inst(swab32(ppc_inst_val(x))); } +static inline bool ppc_inst_equal(u32 x, u32 y) +{ + return x == y; +} + #endif /* _ASM_INST_H */
diff --git a/arch/powerpc/kernel/trace/ftrace.c b/arch/powerpc/kernel/trace/ftrace.c
index cc23c63f3769..cbb19af4a72a 100644
--- a/arch/powerpc/kernel/trace/ftrace.c
+++ b/arch/powerpc/kernel/trace/ftrace.c@@ -72,7 +72,7 @@ ftrace_modify_code(unsigned long ip, unsigned int old, unsigned int new) return -EFAULT; /* Make sure it is what we expect it to be */ - if (replaced != old) { + if (!ppc_inst_equal(replaced, old)) { pr_err("%p: replaced (%#x) != old (%#x)", (void *)ip, ppc_inst_val(replaced), ppc_inst_val(old)); return -EINVAL;
@@ -170,7 +170,8 @@ __ftrace_make_nop(struct module *mod, } /* We expect either a mflr r0, or a std r0, LRSAVE(r1) */ - if (op != ppc_inst(PPC_INST_MFLR) && op != ppc_inst(PPC_INST_STD_LR)) { + if (!ppc_inst_equal(op, ppc_inst(PPC_INST_MFLR)) && + !ppc_inst_equal(op, ppc_inst(PPC_INST_STD_LR))) { pr_err("Unexpected instruction %08x around bl _mcount\n", ppc_inst_val(op)); return -EINVAL;
@@ -201,7 +202,7 @@ __ftrace_make_nop(struct module *mod, return -EFAULT; } - if (op != ppc_inst(PPC_INST_LD_TOC)) { + if (!ppc_inst_equal(op, ppc_inst(PPC_INST_LD_TOC))) { pr_err("Expected %08x found %08x\n", PPC_INST_LD_TOC, ppc_inst_val(op)); return -EINVAL; }
@@ -498,7 +499,7 @@ expected_nop_sequence(void *ip, unsigned int op0, unsigned int op1) * The load offset is different depending on the ABI. For simplicity * just mask it out when doing the compare. */ - if (op0 != ppc_inst(0x48000008) || + if (!ppc_inst_equal(op0, ppc_inst(0x48000008)) || (ppc_inst_val(op1) & 0xffff0000) != 0xe8410000) return 0; return 1;
@@ -508,7 +509,7 @@ static int expected_nop_sequence(void *ip, unsigned int op0, unsigned int op1) { /* look for patched "NOP" on ppc64 with -mprofile-kernel */ - if (op0 != ppc_inst(PPC_INST_NOP)) + if (!ppc_inst_equal(op0, ppc_inst(PPC_INST_NOP))) return 0; return 1; }
@@ -591,7 +592,7 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr) return -EFAULT; /* It should be pointing to a nop */ - if (op != ppc_inst(PPC_INST_NOP)) { + if (!ppc_inst_equal(op, ppc_inst(PPC_INST_NOP))) { pr_err("Expected NOP but have %x\n", ppc_inst_val(op)); return -EINVAL; }
@@ -648,7 +649,7 @@ static int __ftrace_make_call_kernel(struct dyn_ftrace *rec, unsigned long addr) return -EFAULT; } - if (op != ppc_inst(PPC_INST_NOP)) { + if (!ppc_inst_equal(op, ppc_inst(PPC_INST_NOP))) { pr_err("Unexpected call sequence at %p: %x\n", ip, ppc_inst_val(op)); return -EINVAL; }
diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c
index f5c6dcbac44b..d298bb16936e 100644
--- a/arch/powerpc/lib/code-patching.c
+++ b/arch/powerpc/lib/code-patching.c@@ -479,7 +479,7 @@ static void __init test_branch_iform(void) /* Check flags are masked correctly */ err = create_branch(&instr, &instr, addr, 0xFFFFFFFC); check(instr_is_branch_to_addr(&instr, addr)); - check(instr == ppc_inst(0x48000000)); + check(ppc_inst_equal(instr, ppc_inst(0x48000000))); } static void __init test_create_function_call(void)
@@ -564,7 +564,7 @@ static void __init test_branch_bform(void) /* Check flags are masked correctly */ err = create_cond_branch(&instr, iptr, addr, 0xFFFFFFFC); check(instr_is_branch_to_addr(&instr, addr)); - check(instr == ppc_inst(0x43FF0000)); + check(ppc_inst_equal(instr, ppc_inst(0x43FF0000))); } static void __init test_translate_branch(void)
@@ -598,7 +598,7 @@ static void __init test_translate_branch(void) patch_instruction(q, instr); check(instr_is_branch_to_addr(p, addr)); check(instr_is_branch_to_addr(q, addr)); - check(*q == ppc_inst(0x4a000000)); + check(ppc_inst_equal(*q, ppc_inst(0x4a000000))); /* Maximum positive case, move x to x - 32 MB + 4 */ p = buf + 0x2000000;
@@ -609,7 +609,7 @@ static void __init test_translate_branch(void) patch_instruction(q, instr); check(instr_is_branch_to_addr(p, addr)); check(instr_is_branch_to_addr(q, addr)); - check(*q == ppc_inst(0x49fffffc)); + check(ppc_inst_equal(*q, ppc_inst(0x49fffffc))); /* Jump to x + 16 MB moved to x + 20 MB */ p = buf;
@@ -655,7 +655,7 @@ static void __init test_translate_branch(void) patch_instruction(q, instr); check(instr_is_branch_to_addr(p, addr)); check(instr_is_branch_to_addr(q, addr)); - check(*q == ppc_inst(0x43ff8000)); + check(ppc_inst_equal(*q, ppc_inst(0x43ff8000))); /* Maximum positive case, move x to x - 32 KB + 4 */ p = buf + 0x8000;
@@ -667,7 +667,7 @@ static void __init test_translate_branch(void) patch_instruction(q, instr); check(instr_is_branch_to_addr(p, addr)); check(instr_is_branch_to_addr(q, addr)); - check(*q == ppc_inst(0x43ff7ffc)); + check(ppc_inst_equal(*q, ppc_inst(0x43ff7ffc))); /* Jump to x + 12 KB moved to x + 20 KB */ p = buf;
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 99ba585a769b..2e8ed8cdcf28 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c@@ -947,7 +947,7 @@ static void remove_bpts(void) if ((bp->enabled & (BP_TRAP|BP_CIABR)) != BP_TRAP) continue; if (mread(bp->address, &instr, 4) == 4 - && instr == ppc_inst(bpinstr) + && ppc_inst_equal(instr, ppc_inst(bpinstr)) && patch_instruction( (unsigned int *)bp->address, bp->instr[0]) != 0) printf("Couldn't remove breakpoint at %lx\n",
@@ -2862,7 +2862,7 @@ generic_inst_dump(unsigned long adr, long count, int praddr, break; } inst = ppc_inst(GETWORD(val)); - if (adr > first_adr && inst == last_inst) { + if (adr > first_adr && ppc_inst_equal(inst, last_inst)) { if (!dotted) { printf(" ...\n"); dotted = 1;
--
2.17.1