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362 lines
11 KiB
362 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright 2008 Michael Ellerman, IBM Corporation. |
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*/ |
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#include <linux/vmalloc.h> |
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#include <linux/init.h> |
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#include <asm/code-patching.h> |
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static int __init instr_is_branch_to_addr(const u32 *instr, unsigned long addr) |
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{ |
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if (instr_is_branch_iform(ppc_inst_read(instr)) || |
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instr_is_branch_bform(ppc_inst_read(instr))) |
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return branch_target(instr) == addr; |
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return 0; |
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} |
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static void __init test_trampoline(void) |
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{ |
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asm ("nop;nop;\n"); |
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} |
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#define check(x) do { \ |
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if (!(x)) \ |
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pr_err("code-patching: test failed at line %d\n", __LINE__); \ |
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} while (0) |
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static void __init test_branch_iform(void) |
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{ |
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int err; |
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ppc_inst_t instr; |
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u32 tmp[2]; |
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u32 *iptr = tmp; |
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unsigned long addr = (unsigned long)tmp; |
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/* The simplest case, branch to self, no flags */ |
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check(instr_is_branch_iform(ppc_inst(0x48000000))); |
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/* All bits of target set, and flags */ |
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check(instr_is_branch_iform(ppc_inst(0x4bffffff))); |
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/* High bit of opcode set, which is wrong */ |
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check(!instr_is_branch_iform(ppc_inst(0xcbffffff))); |
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/* Middle bits of opcode set, which is wrong */ |
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check(!instr_is_branch_iform(ppc_inst(0x7bffffff))); |
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/* Simplest case, branch to self with link */ |
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check(instr_is_branch_iform(ppc_inst(0x48000001))); |
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/* All bits of targets set */ |
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check(instr_is_branch_iform(ppc_inst(0x4bfffffd))); |
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/* Some bits of targets set */ |
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check(instr_is_branch_iform(ppc_inst(0x4bff00fd))); |
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/* Must be a valid branch to start with */ |
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check(!instr_is_branch_iform(ppc_inst(0x7bfffffd))); |
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/* Absolute branch to 0x100 */ |
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ppc_inst_write(iptr, ppc_inst(0x48000103)); |
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check(instr_is_branch_to_addr(iptr, 0x100)); |
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/* Absolute branch to 0x420fc */ |
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ppc_inst_write(iptr, ppc_inst(0x480420ff)); |
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check(instr_is_branch_to_addr(iptr, 0x420fc)); |
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/* Maximum positive relative branch, + 20MB - 4B */ |
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ppc_inst_write(iptr, ppc_inst(0x49fffffc)); |
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check(instr_is_branch_to_addr(iptr, addr + 0x1FFFFFC)); |
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/* Smallest negative relative branch, - 4B */ |
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ppc_inst_write(iptr, ppc_inst(0x4bfffffc)); |
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check(instr_is_branch_to_addr(iptr, addr - 4)); |
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/* Largest negative relative branch, - 32 MB */ |
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ppc_inst_write(iptr, ppc_inst(0x4a000000)); |
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check(instr_is_branch_to_addr(iptr, addr - 0x2000000)); |
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/* Branch to self, with link */ |
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err = create_branch(&instr, iptr, addr, BRANCH_SET_LINK); |
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ppc_inst_write(iptr, instr); |
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check(instr_is_branch_to_addr(iptr, addr)); |
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/* Branch to self - 0x100, with link */ |
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err = create_branch(&instr, iptr, addr - 0x100, BRANCH_SET_LINK); |
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ppc_inst_write(iptr, instr); |
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check(instr_is_branch_to_addr(iptr, addr - 0x100)); |
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/* Branch to self + 0x100, no link */ |
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err = create_branch(&instr, iptr, addr + 0x100, 0); |
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ppc_inst_write(iptr, instr); |
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check(instr_is_branch_to_addr(iptr, addr + 0x100)); |
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/* Maximum relative negative offset, - 32 MB */ |
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err = create_branch(&instr, iptr, addr - 0x2000000, BRANCH_SET_LINK); |
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ppc_inst_write(iptr, instr); |
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check(instr_is_branch_to_addr(iptr, addr - 0x2000000)); |
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/* Out of range relative negative offset, - 32 MB + 4*/ |
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err = create_branch(&instr, iptr, addr - 0x2000004, BRANCH_SET_LINK); |
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check(err); |
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/* Out of range relative positive offset, + 32 MB */ |
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err = create_branch(&instr, iptr, addr + 0x2000000, BRANCH_SET_LINK); |
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check(err); |
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/* Unaligned target */ |
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err = create_branch(&instr, iptr, addr + 3, BRANCH_SET_LINK); |
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check(err); |
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/* Check flags are masked correctly */ |
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err = create_branch(&instr, iptr, addr, 0xFFFFFFFC); |
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ppc_inst_write(iptr, instr); |
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check(instr_is_branch_to_addr(iptr, addr)); |
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check(ppc_inst_equal(instr, ppc_inst(0x48000000))); |
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} |
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static void __init test_create_function_call(void) |
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{ |
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u32 *iptr; |
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unsigned long dest; |
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ppc_inst_t instr; |
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/* Check we can create a function call */ |
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iptr = (u32 *)ppc_function_entry(test_trampoline); |
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dest = ppc_function_entry(test_create_function_call); |
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create_branch(&instr, iptr, dest, BRANCH_SET_LINK); |
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patch_instruction(iptr, instr); |
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check(instr_is_branch_to_addr(iptr, dest)); |
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} |
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static void __init test_branch_bform(void) |
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{ |
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int err; |
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unsigned long addr; |
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ppc_inst_t instr; |
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u32 tmp[2]; |
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u32 *iptr = tmp; |
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unsigned int flags; |
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addr = (unsigned long)iptr; |
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/* The simplest case, branch to self, no flags */ |
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check(instr_is_branch_bform(ppc_inst(0x40000000))); |
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/* All bits of target set, and flags */ |
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check(instr_is_branch_bform(ppc_inst(0x43ffffff))); |
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/* High bit of opcode set, which is wrong */ |
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check(!instr_is_branch_bform(ppc_inst(0xc3ffffff))); |
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/* Middle bits of opcode set, which is wrong */ |
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check(!instr_is_branch_bform(ppc_inst(0x7bffffff))); |
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/* Absolute conditional branch to 0x100 */ |
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ppc_inst_write(iptr, ppc_inst(0x43ff0103)); |
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check(instr_is_branch_to_addr(iptr, 0x100)); |
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/* Absolute conditional branch to 0x20fc */ |
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ppc_inst_write(iptr, ppc_inst(0x43ff20ff)); |
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check(instr_is_branch_to_addr(iptr, 0x20fc)); |
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/* Maximum positive relative conditional branch, + 32 KB - 4B */ |
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ppc_inst_write(iptr, ppc_inst(0x43ff7ffc)); |
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check(instr_is_branch_to_addr(iptr, addr + 0x7FFC)); |
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/* Smallest negative relative conditional branch, - 4B */ |
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ppc_inst_write(iptr, ppc_inst(0x43fffffc)); |
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check(instr_is_branch_to_addr(iptr, addr - 4)); |
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/* Largest negative relative conditional branch, - 32 KB */ |
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ppc_inst_write(iptr, ppc_inst(0x43ff8000)); |
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check(instr_is_branch_to_addr(iptr, addr - 0x8000)); |
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/* All condition code bits set & link */ |
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flags = 0x3ff000 | BRANCH_SET_LINK; |
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/* Branch to self */ |
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err = create_cond_branch(&instr, iptr, addr, flags); |
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ppc_inst_write(iptr, instr); |
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check(instr_is_branch_to_addr(iptr, addr)); |
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/* Branch to self - 0x100 */ |
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err = create_cond_branch(&instr, iptr, addr - 0x100, flags); |
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ppc_inst_write(iptr, instr); |
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check(instr_is_branch_to_addr(iptr, addr - 0x100)); |
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/* Branch to self + 0x100 */ |
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err = create_cond_branch(&instr, iptr, addr + 0x100, flags); |
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ppc_inst_write(iptr, instr); |
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check(instr_is_branch_to_addr(iptr, addr + 0x100)); |
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/* Maximum relative negative offset, - 32 KB */ |
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err = create_cond_branch(&instr, iptr, addr - 0x8000, flags); |
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ppc_inst_write(iptr, instr); |
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check(instr_is_branch_to_addr(iptr, addr - 0x8000)); |
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/* Out of range relative negative offset, - 32 KB + 4*/ |
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err = create_cond_branch(&instr, iptr, addr - 0x8004, flags); |
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check(err); |
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/* Out of range relative positive offset, + 32 KB */ |
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err = create_cond_branch(&instr, iptr, addr + 0x8000, flags); |
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check(err); |
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/* Unaligned target */ |
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err = create_cond_branch(&instr, iptr, addr + 3, flags); |
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check(err); |
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/* Check flags are masked correctly */ |
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err = create_cond_branch(&instr, iptr, addr, 0xFFFFFFFC); |
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ppc_inst_write(iptr, instr); |
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check(instr_is_branch_to_addr(iptr, addr)); |
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check(ppc_inst_equal(instr, ppc_inst(0x43FF0000))); |
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} |
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static void __init test_translate_branch(void) |
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{ |
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unsigned long addr; |
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void *p, *q; |
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ppc_inst_t instr; |
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void *buf; |
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buf = vmalloc(PAGE_ALIGN(0x2000000 + 1)); |
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check(buf); |
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if (!buf) |
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return; |
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/* Simple case, branch to self moved a little */ |
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p = buf; |
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addr = (unsigned long)p; |
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create_branch(&instr, p, addr, 0); |
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ppc_inst_write(p, instr); |
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check(instr_is_branch_to_addr(p, addr)); |
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q = p + 4; |
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translate_branch(&instr, q, p); |
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ppc_inst_write(q, instr); |
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check(instr_is_branch_to_addr(q, addr)); |
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/* Maximum negative case, move b . to addr + 32 MB */ |
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p = buf; |
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addr = (unsigned long)p; |
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create_branch(&instr, p, addr, 0); |
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ppc_inst_write(p, instr); |
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q = buf + 0x2000000; |
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translate_branch(&instr, q, p); |
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ppc_inst_write(q, instr); |
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check(instr_is_branch_to_addr(p, addr)); |
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check(instr_is_branch_to_addr(q, addr)); |
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check(ppc_inst_equal(ppc_inst_read(q), ppc_inst(0x4a000000))); |
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/* Maximum positive case, move x to x - 32 MB + 4 */ |
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p = buf + 0x2000000; |
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addr = (unsigned long)p; |
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create_branch(&instr, p, addr, 0); |
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ppc_inst_write(p, instr); |
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q = buf + 4; |
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translate_branch(&instr, q, p); |
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ppc_inst_write(q, instr); |
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check(instr_is_branch_to_addr(p, addr)); |
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check(instr_is_branch_to_addr(q, addr)); |
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check(ppc_inst_equal(ppc_inst_read(q), ppc_inst(0x49fffffc))); |
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/* Jump to x + 16 MB moved to x + 20 MB */ |
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p = buf; |
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addr = 0x1000000 + (unsigned long)buf; |
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create_branch(&instr, p, addr, BRANCH_SET_LINK); |
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ppc_inst_write(p, instr); |
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q = buf + 0x1400000; |
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translate_branch(&instr, q, p); |
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ppc_inst_write(q, instr); |
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check(instr_is_branch_to_addr(p, addr)); |
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check(instr_is_branch_to_addr(q, addr)); |
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/* Jump to x + 16 MB moved to x - 16 MB + 4 */ |
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p = buf + 0x1000000; |
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addr = 0x2000000 + (unsigned long)buf; |
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create_branch(&instr, p, addr, 0); |
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ppc_inst_write(p, instr); |
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q = buf + 4; |
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translate_branch(&instr, q, p); |
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ppc_inst_write(q, instr); |
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check(instr_is_branch_to_addr(p, addr)); |
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check(instr_is_branch_to_addr(q, addr)); |
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/* Conditional branch tests */ |
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/* Simple case, branch to self moved a little */ |
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p = buf; |
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addr = (unsigned long)p; |
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create_cond_branch(&instr, p, addr, 0); |
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ppc_inst_write(p, instr); |
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check(instr_is_branch_to_addr(p, addr)); |
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q = buf + 4; |
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translate_branch(&instr, q, p); |
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ppc_inst_write(q, instr); |
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check(instr_is_branch_to_addr(q, addr)); |
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/* Maximum negative case, move b . to addr + 32 KB */ |
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p = buf; |
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addr = (unsigned long)p; |
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create_cond_branch(&instr, p, addr, 0xFFFFFFFC); |
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ppc_inst_write(p, instr); |
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q = buf + 0x8000; |
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translate_branch(&instr, q, p); |
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ppc_inst_write(q, instr); |
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check(instr_is_branch_to_addr(p, addr)); |
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check(instr_is_branch_to_addr(q, addr)); |
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check(ppc_inst_equal(ppc_inst_read(q), ppc_inst(0x43ff8000))); |
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/* Maximum positive case, move x to x - 32 KB + 4 */ |
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p = buf + 0x8000; |
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addr = (unsigned long)p; |
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create_cond_branch(&instr, p, addr, 0xFFFFFFFC); |
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ppc_inst_write(p, instr); |
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q = buf + 4; |
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translate_branch(&instr, q, p); |
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ppc_inst_write(q, instr); |
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check(instr_is_branch_to_addr(p, addr)); |
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check(instr_is_branch_to_addr(q, addr)); |
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check(ppc_inst_equal(ppc_inst_read(q), ppc_inst(0x43ff7ffc))); |
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/* Jump to x + 12 KB moved to x + 20 KB */ |
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p = buf; |
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addr = 0x3000 + (unsigned long)buf; |
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create_cond_branch(&instr, p, addr, BRANCH_SET_LINK); |
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ppc_inst_write(p, instr); |
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q = buf + 0x5000; |
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translate_branch(&instr, q, p); |
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ppc_inst_write(q, instr); |
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check(instr_is_branch_to_addr(p, addr)); |
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check(instr_is_branch_to_addr(q, addr)); |
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/* Jump to x + 8 KB moved to x - 8 KB + 4 */ |
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p = buf + 0x2000; |
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addr = 0x4000 + (unsigned long)buf; |
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create_cond_branch(&instr, p, addr, 0); |
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ppc_inst_write(p, instr); |
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q = buf + 4; |
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translate_branch(&instr, q, p); |
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ppc_inst_write(q, instr); |
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check(instr_is_branch_to_addr(p, addr)); |
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check(instr_is_branch_to_addr(q, addr)); |
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/* Free the buffer we were using */ |
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vfree(buf); |
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} |
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static void __init test_prefixed_patching(void) |
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{ |
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u32 *iptr = (u32 *)ppc_function_entry(test_trampoline); |
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u32 expected[2] = {OP_PREFIX << 26, 0}; |
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ppc_inst_t inst = ppc_inst_prefix(OP_PREFIX << 26, 0); |
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if (!IS_ENABLED(CONFIG_PPC64)) |
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return; |
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patch_instruction(iptr, inst); |
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check(!memcmp(iptr, expected, sizeof(expected))); |
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} |
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static int __init test_code_patching(void) |
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{ |
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pr_info("Running code patching self-tests ...\n"); |
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test_branch_iform(); |
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test_branch_bform(); |
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test_create_function_call(); |
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test_translate_branch(); |
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test_prefixed_patching(); |
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return 0; |
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} |
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late_initcall(test_code_patching);
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