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161 lines
3.4 KiB
161 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Common helper functions for kprobes and uprobes |
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* |
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* Copyright IBM Corp. 2014 |
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*/ |
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#include <linux/errno.h> |
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#include <asm/kprobes.h> |
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#include <asm/dis.h> |
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int probe_is_prohibited_opcode(u16 *insn) |
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{ |
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if (!is_known_insn((unsigned char *)insn)) |
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return -EINVAL; |
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switch (insn[0] >> 8) { |
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case 0x0c: /* bassm */ |
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case 0x0b: /* bsm */ |
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case 0x83: /* diag */ |
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case 0x44: /* ex */ |
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case 0xac: /* stnsm */ |
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case 0xad: /* stosm */ |
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return -EINVAL; |
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case 0xc6: |
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switch (insn[0] & 0x0f) { |
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case 0x00: /* exrl */ |
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return -EINVAL; |
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} |
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} |
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switch (insn[0]) { |
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case 0x0101: /* pr */ |
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case 0xb25a: /* bsa */ |
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case 0xb240: /* bakr */ |
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case 0xb258: /* bsg */ |
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case 0xb218: /* pc */ |
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case 0xb228: /* pt */ |
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case 0xb98d: /* epsw */ |
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case 0xe560: /* tbegin */ |
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case 0xe561: /* tbeginc */ |
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case 0xb2f8: /* tend */ |
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return -EINVAL; |
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} |
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return 0; |
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} |
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int probe_get_fixup_type(u16 *insn) |
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{ |
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/* default fixup method */ |
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int fixup = FIXUP_PSW_NORMAL; |
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switch (insn[0] >> 8) { |
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case 0x05: /* balr */ |
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case 0x0d: /* basr */ |
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fixup = FIXUP_RETURN_REGISTER; |
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/* if r2 = 0, no branch will be taken */ |
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if ((insn[0] & 0x0f) == 0) |
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fixup |= FIXUP_BRANCH_NOT_TAKEN; |
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break; |
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case 0x06: /* bctr */ |
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case 0x07: /* bcr */ |
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fixup = FIXUP_BRANCH_NOT_TAKEN; |
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break; |
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case 0x45: /* bal */ |
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case 0x4d: /* bas */ |
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fixup = FIXUP_RETURN_REGISTER; |
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break; |
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case 0x47: /* bc */ |
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case 0x46: /* bct */ |
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case 0x86: /* bxh */ |
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case 0x87: /* bxle */ |
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fixup = FIXUP_BRANCH_NOT_TAKEN; |
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break; |
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case 0x82: /* lpsw */ |
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fixup = FIXUP_NOT_REQUIRED; |
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break; |
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case 0xb2: /* lpswe */ |
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if ((insn[0] & 0xff) == 0xb2) |
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fixup = FIXUP_NOT_REQUIRED; |
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break; |
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case 0xa7: /* bras */ |
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if ((insn[0] & 0x0f) == 0x05) |
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fixup |= FIXUP_RETURN_REGISTER; |
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break; |
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case 0xc0: |
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if ((insn[0] & 0x0f) == 0x05) /* brasl */ |
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fixup |= FIXUP_RETURN_REGISTER; |
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break; |
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case 0xeb: |
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switch (insn[2] & 0xff) { |
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case 0x44: /* bxhg */ |
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case 0x45: /* bxleg */ |
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fixup = FIXUP_BRANCH_NOT_TAKEN; |
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break; |
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} |
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break; |
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case 0xe3: /* bctg */ |
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if ((insn[2] & 0xff) == 0x46) |
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fixup = FIXUP_BRANCH_NOT_TAKEN; |
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break; |
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case 0xec: |
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switch (insn[2] & 0xff) { |
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case 0xe5: /* clgrb */ |
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case 0xe6: /* cgrb */ |
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case 0xf6: /* crb */ |
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case 0xf7: /* clrb */ |
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case 0xfc: /* cgib */ |
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case 0xfd: /* cglib */ |
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case 0xfe: /* cib */ |
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case 0xff: /* clib */ |
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fixup = FIXUP_BRANCH_NOT_TAKEN; |
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break; |
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} |
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break; |
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} |
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return fixup; |
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} |
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int probe_is_insn_relative_long(u16 *insn) |
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{ |
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/* Check if we have a RIL-b or RIL-c format instruction which |
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* we need to modify in order to avoid instruction emulation. */ |
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switch (insn[0] >> 8) { |
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case 0xc0: |
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if ((insn[0] & 0x0f) == 0x00) /* larl */ |
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return true; |
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break; |
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case 0xc4: |
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switch (insn[0] & 0x0f) { |
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case 0x02: /* llhrl */ |
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case 0x04: /* lghrl */ |
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case 0x05: /* lhrl */ |
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case 0x06: /* llghrl */ |
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case 0x07: /* sthrl */ |
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case 0x08: /* lgrl */ |
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case 0x0b: /* stgrl */ |
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case 0x0c: /* lgfrl */ |
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case 0x0d: /* lrl */ |
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case 0x0e: /* llgfrl */ |
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case 0x0f: /* strl */ |
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return true; |
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} |
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break; |
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case 0xc6: |
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switch (insn[0] & 0x0f) { |
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case 0x02: /* pfdrl */ |
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case 0x04: /* cghrl */ |
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case 0x05: /* chrl */ |
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case 0x06: /* clghrl */ |
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case 0x07: /* clhrl */ |
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case 0x08: /* cgrl */ |
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case 0x0a: /* clgrl */ |
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case 0x0c: /* cgfrl */ |
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case 0x0d: /* crl */ |
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case 0x0e: /* clgfrl */ |
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case 0x0f: /* clrl */ |
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return true; |
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} |
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break; |
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} |
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return false; |
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}
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