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-rw-r--r--arch/arm/kernel/uprobes-arm.c234
1 files changed, 0 insertions, 234 deletions
diff --git a/arch/arm/kernel/uprobes-arm.c b/arch/arm/kernel/uprobes-arm.c
deleted file mode 100644
index d3b655ff17da..000000000000
--- a/arch/arm/kernel/uprobes-arm.c
+++ /dev/null
@@ -1,234 +0,0 @@
-/*
- * Copyright (C) 2012 Rabin Vincent <rabin at rab.in>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/stddef.h>
-#include <linux/wait.h>
-#include <linux/uprobes.h>
-#include <linux/module.h>
-
-#include "probes.h"
-#include "probes-arm.h"
-#include "uprobes.h"
-
-static int uprobes_substitute_pc(unsigned long *pinsn, u32 oregs)
-{
- probes_opcode_t insn = __mem_to_opcode_arm(*pinsn);
- probes_opcode_t temp;
- probes_opcode_t mask;
- int freereg;
- u32 free = 0xffff;
- u32 regs;
-
- for (regs = oregs; regs; regs >>= 4, insn >>= 4) {
- if ((regs & 0xf) == REG_TYPE_NONE)
- continue;
-
- free &= ~(1 << (insn & 0xf));
- }
-
- /* No PC, no problem */
- if (free & (1 << 15))
- return 15;
-
- if (!free)
- return -1;
-
- /*
- * fls instead of ffs ensures that for "ldrd r0, r1, [pc]" we would
- * pick LR instead of R1.
- */
- freereg = free = fls(free) - 1;
-
- temp = __mem_to_opcode_arm(*pinsn);
- insn = temp;
- regs = oregs;
- mask = 0xf;
-
- for (; regs; regs >>= 4, mask <<= 4, free <<= 4, temp >>= 4) {
- if ((regs & 0xf) == REG_TYPE_NONE)
- continue;
-
- if ((temp & 0xf) != 15)
- continue;
-
- insn &= ~mask;
- insn |= free & mask;
- }
-
- *pinsn = __opcode_to_mem_arm(insn);
- return freereg;
-}
-
-static void uprobe_set_pc(struct arch_uprobe *auprobe,
- struct arch_uprobe_task *autask,
- struct pt_regs *regs)
-{
- u32 pcreg = auprobe->pcreg;
-
- autask->backup = regs->uregs[pcreg];
- regs->uregs[pcreg] = regs->ARM_pc + 8;
-}
-
-static void uprobe_unset_pc(struct arch_uprobe *auprobe,
- struct arch_uprobe_task *autask,
- struct pt_regs *regs)
-{
- /* PC will be taken care of by common code */
- regs->uregs[auprobe->pcreg] = autask->backup;
-}
-
-static void uprobe_aluwrite_pc(struct arch_uprobe *auprobe,
- struct arch_uprobe_task *autask,
- struct pt_regs *regs)
-{
- u32 pcreg = auprobe->pcreg;
-
- alu_write_pc(regs->uregs[pcreg], regs);
- regs->uregs[pcreg] = autask->backup;
-}
-
-static void uprobe_write_pc(struct arch_uprobe *auprobe,
- struct arch_uprobe_task *autask,
- struct pt_regs *regs)
-{
- u32 pcreg = auprobe->pcreg;
-
- load_write_pc(regs->uregs[pcreg], regs);
- regs->uregs[pcreg] = autask->backup;
-}
-
-enum probes_insn
-decode_pc_ro(probes_opcode_t insn, struct arch_probes_insn *asi,
- const struct decode_header *d)
-{
- struct arch_uprobe *auprobe = container_of(asi, struct arch_uprobe,
- asi);
- struct decode_emulate *decode = (struct decode_emulate *) d;
- u32 regs = decode->header.type_regs.bits >> DECODE_TYPE_BITS;
- int reg;
-
- reg = uprobes_substitute_pc(&auprobe->ixol[0], regs);
- if (reg == 15)
- return INSN_GOOD;
-
- if (reg == -1)
- return INSN_REJECTED;
-
- auprobe->pcreg = reg;
- auprobe->prehandler = uprobe_set_pc;
- auprobe->posthandler = uprobe_unset_pc;
-
- return INSN_GOOD;
-}
-
-enum probes_insn
-decode_wb_pc(probes_opcode_t insn, struct arch_probes_insn *asi,
- const struct decode_header *d, bool alu)
-{
- struct arch_uprobe *auprobe = container_of(asi, struct arch_uprobe,
- asi);
- enum probes_insn ret = decode_pc_ro(insn, asi, d);
-
- if (((insn >> 12) & 0xf) == 15)
- auprobe->posthandler = alu ? uprobe_aluwrite_pc
- : uprobe_write_pc;
-
- return ret;
-}
-
-enum probes_insn
-decode_rd12rn16rm0rs8_rwflags(probes_opcode_t insn,
- struct arch_probes_insn *asi,
- const struct decode_header *d)
-{
- return decode_wb_pc(insn, asi, d, true);
-}
-
-enum probes_insn
-decode_ldr(probes_opcode_t insn, struct arch_probes_insn *asi,
- const struct decode_header *d)
-{
- return decode_wb_pc(insn, asi, d, false);
-}
-
-enum probes_insn
-uprobe_decode_ldmstm(probes_opcode_t insn,
- struct arch_probes_insn *asi,
- const struct decode_header *d)
-{
- struct arch_uprobe *auprobe = container_of(asi, struct arch_uprobe,
- asi);
- unsigned reglist = insn & 0xffff;
- int rn = (insn >> 16) & 0xf;
- int lbit = insn & (1 << 20);
- unsigned used = reglist | (1 << rn);
-
- if (rn == 15)
- return INSN_REJECTED;
-
- if (!(used & (1 << 15)))
- return INSN_GOOD;
-
- if (used & (1 << 14))
- return INSN_REJECTED;
-
- /* Use LR instead of PC */
- insn ^= 0xc000;
-
- auprobe->pcreg = 14;
- auprobe->ixol[0] = __opcode_to_mem_arm(insn);
-
- auprobe->prehandler = uprobe_set_pc;
- if (lbit)
- auprobe->posthandler = uprobe_write_pc;
- else
- auprobe->posthandler = uprobe_unset_pc;
-
- return INSN_GOOD;
-}
-
-const union decode_action uprobes_probes_actions[] = {
- [PROBES_EMULATE_NONE] = {.handler = probes_simulate_nop},
- [PROBES_SIMULATE_NOP] = {.handler = probes_simulate_nop},
- [PROBES_PRELOAD_IMM] = {.handler = probes_simulate_nop},
- [PROBES_PRELOAD_REG] = {.handler = probes_simulate_nop},
- [PROBES_BRANCH_IMM] = {.handler = simulate_blx1},
- [PROBES_MRS] = {.handler = simulate_mrs},
- [PROBES_BRANCH_REG] = {.handler = simulate_blx2bx},
- [PROBES_CLZ] = {.handler = probes_simulate_nop},
- [PROBES_SATURATING_ARITHMETIC] = {.handler = probes_simulate_nop},
- [PROBES_MUL1] = {.handler = probes_simulate_nop},
- [PROBES_MUL2] = {.handler = probes_simulate_nop},
- [PROBES_SWP] = {.handler = probes_simulate_nop},
- [PROBES_LDRSTRD] = {.decoder = decode_pc_ro},
- [PROBES_LOAD_EXTRA] = {.decoder = decode_pc_ro},
- [PROBES_LOAD] = {.decoder = decode_ldr},
- [PROBES_STORE_EXTRA] = {.decoder = decode_pc_ro},
- [PROBES_STORE] = {.decoder = decode_pc_ro},
- [PROBES_MOV_IP_SP] = {.handler = simulate_mov_ipsp},
- [PROBES_DATA_PROCESSING_REG] = {
- .decoder = decode_rd12rn16rm0rs8_rwflags},
- [PROBES_DATA_PROCESSING_IMM] = {
- .decoder = decode_rd12rn16rm0rs8_rwflags},
- [PROBES_MOV_HALFWORD] = {.handler = probes_simulate_nop},
- [PROBES_SEV] = {.handler = probes_simulate_nop},
- [PROBES_WFE] = {.handler = probes_simulate_nop},
- [PROBES_SATURATE] = {.handler = probes_simulate_nop},
- [PROBES_REV] = {.handler = probes_simulate_nop},
- [PROBES_MMI] = {.handler = probes_simulate_nop},
- [PROBES_PACK] = {.handler = probes_simulate_nop},
- [PROBES_EXTEND] = {.handler = probes_simulate_nop},
- [PROBES_EXTEND_ADD] = {.handler = probes_simulate_nop},
- [PROBES_MUL_ADD_LONG] = {.handler = probes_simulate_nop},
- [PROBES_MUL_ADD] = {.handler = probes_simulate_nop},
- [PROBES_BITFIELD] = {.handler = probes_simulate_nop},
- [PROBES_BRANCH] = {.handler = simulate_bbl},
- [PROBES_LDMSTM] = {.decoder = uprobe_decode_ldmstm}
-};
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.