From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- arch/arm/probes/kprobes/actions-thumb.c | 675 ++++++++++++++++++++++++++++++++ 1 file changed, 675 insertions(+) create mode 100644 arch/arm/probes/kprobes/actions-thumb.c (limited to 'arch/arm/probes/kprobes/actions-thumb.c') diff --git a/arch/arm/probes/kprobes/actions-thumb.c b/arch/arm/probes/kprobes/actions-thumb.c new file mode 100644 index 000000000..51624fc26 --- /dev/null +++ b/arch/arm/probes/kprobes/actions-thumb.c @@ -0,0 +1,675 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * arch/arm/probes/kprobes/actions-thumb.c + * + * Copyright (C) 2011 Jon Medhurst . + */ + +#include +#include +#include +#include + +#include "../decode-thumb.h" +#include "core.h" +#include "checkers.h" + +/* These emulation encodings are functionally equivalent... */ +#define t32_emulate_rd8rn16rm0ra12_noflags \ + t32_emulate_rdlo12rdhi8rn16rm0_noflags + +/* t32 thumb actions */ + +static void __kprobes +t32_simulate_table_branch(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + unsigned long pc = regs->ARM_pc; + int rn = (insn >> 16) & 0xf; + int rm = insn & 0xf; + + unsigned long rnv = (rn == 15) ? pc : regs->uregs[rn]; + unsigned long rmv = regs->uregs[rm]; + unsigned int halfwords; + + if (insn & 0x10) /* TBH */ + halfwords = ((u16 *)rnv)[rmv]; + else /* TBB */ + halfwords = ((u8 *)rnv)[rmv]; + + regs->ARM_pc = pc + 2 * halfwords; +} + +static void __kprobes +t32_simulate_mrs(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + int rd = (insn >> 8) & 0xf; + unsigned long mask = 0xf8ff03df; /* Mask out execution state */ + regs->uregs[rd] = regs->ARM_cpsr & mask; +} + +static void __kprobes +t32_simulate_cond_branch(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + unsigned long pc = regs->ARM_pc; + + long offset = insn & 0x7ff; /* imm11 */ + offset += (insn & 0x003f0000) >> 5; /* imm6 */ + offset += (insn & 0x00002000) << 4; /* J1 */ + offset += (insn & 0x00000800) << 7; /* J2 */ + offset -= (insn & 0x04000000) >> 7; /* Apply sign bit */ + + regs->ARM_pc = pc + (offset * 2); +} + +static enum probes_insn __kprobes +t32_decode_cond_branch(probes_opcode_t insn, struct arch_probes_insn *asi, + const struct decode_header *d) +{ + int cc = (insn >> 22) & 0xf; + asi->insn_check_cc = probes_condition_checks[cc]; + asi->insn_handler = t32_simulate_cond_branch; + return INSN_GOOD_NO_SLOT; +} + +static void __kprobes +t32_simulate_branch(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + unsigned long pc = regs->ARM_pc; + + long offset = insn & 0x7ff; /* imm11 */ + offset += (insn & 0x03ff0000) >> 5; /* imm10 */ + offset += (insn & 0x00002000) << 9; /* J1 */ + offset += (insn & 0x00000800) << 10; /* J2 */ + if (insn & 0x04000000) + offset -= 0x00800000; /* Apply sign bit */ + else + offset ^= 0x00600000; /* Invert J1 and J2 */ + + if (insn & (1 << 14)) { + /* BL or BLX */ + regs->ARM_lr = regs->ARM_pc | 1; + if (!(insn & (1 << 12))) { + /* BLX so switch to ARM mode */ + regs->ARM_cpsr &= ~PSR_T_BIT; + pc &= ~3; + } + } + + regs->ARM_pc = pc + (offset * 2); +} + +static void __kprobes +t32_simulate_ldr_literal(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + unsigned long addr = regs->ARM_pc & ~3; + int rt = (insn >> 12) & 0xf; + unsigned long rtv; + + long offset = insn & 0xfff; + if (insn & 0x00800000) + addr += offset; + else + addr -= offset; + + if (insn & 0x00400000) { + /* LDR */ + rtv = *(unsigned long *)addr; + if (rt == 15) { + bx_write_pc(rtv, regs); + return; + } + } else if (insn & 0x00200000) { + /* LDRH */ + if (insn & 0x01000000) + rtv = *(s16 *)addr; + else + rtv = *(u16 *)addr; + } else { + /* LDRB */ + if (insn & 0x01000000) + rtv = *(s8 *)addr; + else + rtv = *(u8 *)addr; + } + + regs->uregs[rt] = rtv; +} + +static enum probes_insn __kprobes +t32_decode_ldmstm(probes_opcode_t insn, struct arch_probes_insn *asi, + const struct decode_header *d) +{ + enum probes_insn ret = kprobe_decode_ldmstm(insn, asi, d); + + /* Fixup modified instruction to have halfwords in correct order...*/ + insn = __mem_to_opcode_arm(asi->insn[0]); + ((u16 *)asi->insn)[0] = __opcode_to_mem_thumb16(insn >> 16); + ((u16 *)asi->insn)[1] = __opcode_to_mem_thumb16(insn & 0xffff); + + return ret; +} + +static void __kprobes +t32_emulate_ldrdstrd(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + unsigned long pc = regs->ARM_pc & ~3; + int rt1 = (insn >> 12) & 0xf; + int rt2 = (insn >> 8) & 0xf; + int rn = (insn >> 16) & 0xf; + + register unsigned long rt1v asm("r0") = regs->uregs[rt1]; + register unsigned long rt2v asm("r1") = regs->uregs[rt2]; + register unsigned long rnv asm("r2") = (rn == 15) ? pc + : regs->uregs[rn]; + + __asm__ __volatile__ ( + "blx %[fn]" + : "=r" (rt1v), "=r" (rt2v), "=r" (rnv) + : "0" (rt1v), "1" (rt2v), "2" (rnv), [fn] "r" (asi->insn_fn) + : "lr", "memory", "cc" + ); + + if (rn != 15) + regs->uregs[rn] = rnv; /* Writeback base register */ + regs->uregs[rt1] = rt1v; + regs->uregs[rt2] = rt2v; +} + +static void __kprobes +t32_emulate_ldrstr(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + int rt = (insn >> 12) & 0xf; + int rn = (insn >> 16) & 0xf; + int rm = insn & 0xf; + + register unsigned long rtv asm("r0") = regs->uregs[rt]; + register unsigned long rnv asm("r2") = regs->uregs[rn]; + register unsigned long rmv asm("r3") = regs->uregs[rm]; + + __asm__ __volatile__ ( + "blx %[fn]" + : "=r" (rtv), "=r" (rnv) + : "0" (rtv), "1" (rnv), "r" (rmv), [fn] "r" (asi->insn_fn) + : "lr", "memory", "cc" + ); + + regs->uregs[rn] = rnv; /* Writeback base register */ + if (rt == 15) /* Can't be true for a STR as they aren't allowed */ + bx_write_pc(rtv, regs); + else + regs->uregs[rt] = rtv; +} + +static void __kprobes +t32_emulate_rd8rn16rm0_rwflags(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + int rd = (insn >> 8) & 0xf; + int rn = (insn >> 16) & 0xf; + int rm = insn & 0xf; + + register unsigned long rdv asm("r1") = regs->uregs[rd]; + register unsigned long rnv asm("r2") = regs->uregs[rn]; + register unsigned long rmv asm("r3") = regs->uregs[rm]; + unsigned long cpsr = regs->ARM_cpsr; + + __asm__ __volatile__ ( + "msr cpsr_fs, %[cpsr] \n\t" + "blx %[fn] \n\t" + "mrs %[cpsr], cpsr \n\t" + : "=r" (rdv), [cpsr] "=r" (cpsr) + : "0" (rdv), "r" (rnv), "r" (rmv), + "1" (cpsr), [fn] "r" (asi->insn_fn) + : "lr", "memory", "cc" + ); + + regs->uregs[rd] = rdv; + regs->ARM_cpsr = (regs->ARM_cpsr & ~APSR_MASK) | (cpsr & APSR_MASK); +} + +static void __kprobes +t32_emulate_rd8pc16_noflags(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + unsigned long pc = regs->ARM_pc; + int rd = (insn >> 8) & 0xf; + + register unsigned long rdv asm("r1") = regs->uregs[rd]; + register unsigned long rnv asm("r2") = pc & ~3; + + __asm__ __volatile__ ( + "blx %[fn]" + : "=r" (rdv) + : "0" (rdv), "r" (rnv), [fn] "r" (asi->insn_fn) + : "lr", "memory", "cc" + ); + + regs->uregs[rd] = rdv; +} + +static void __kprobes +t32_emulate_rd8rn16_noflags(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + int rd = (insn >> 8) & 0xf; + int rn = (insn >> 16) & 0xf; + + register unsigned long rdv asm("r1") = regs->uregs[rd]; + register unsigned long rnv asm("r2") = regs->uregs[rn]; + + __asm__ __volatile__ ( + "blx %[fn]" + : "=r" (rdv) + : "0" (rdv), "r" (rnv), [fn] "r" (asi->insn_fn) + : "lr", "memory", "cc" + ); + + regs->uregs[rd] = rdv; +} + +static void __kprobes +t32_emulate_rdlo12rdhi8rn16rm0_noflags(probes_opcode_t insn, + struct arch_probes_insn *asi, + struct pt_regs *regs) +{ + int rdlo = (insn >> 12) & 0xf; + int rdhi = (insn >> 8) & 0xf; + int rn = (insn >> 16) & 0xf; + int rm = insn & 0xf; + + register unsigned long rdlov asm("r0") = regs->uregs[rdlo]; + register unsigned long rdhiv asm("r1") = regs->uregs[rdhi]; + register unsigned long rnv asm("r2") = regs->uregs[rn]; + register unsigned long rmv asm("r3") = regs->uregs[rm]; + + __asm__ __volatile__ ( + "blx %[fn]" + : "=r" (rdlov), "=r" (rdhiv) + : "0" (rdlov), "1" (rdhiv), "r" (rnv), "r" (rmv), + [fn] "r" (asi->insn_fn) + : "lr", "memory", "cc" + ); + + regs->uregs[rdlo] = rdlov; + regs->uregs[rdhi] = rdhiv; +} +/* t16 thumb actions */ + +static void __kprobes +t16_simulate_bxblx(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + unsigned long pc = regs->ARM_pc + 2; + int rm = (insn >> 3) & 0xf; + unsigned long rmv = (rm == 15) ? pc : regs->uregs[rm]; + + if (insn & (1 << 7)) /* BLX ? */ + regs->ARM_lr = regs->ARM_pc | 1; + + bx_write_pc(rmv, regs); +} + +static void __kprobes +t16_simulate_ldr_literal(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + unsigned long *base = (unsigned long *)((regs->ARM_pc + 2) & ~3); + long index = insn & 0xff; + int rt = (insn >> 8) & 0x7; + regs->uregs[rt] = base[index]; +} + +static void __kprobes +t16_simulate_ldrstr_sp_relative(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + unsigned long* base = (unsigned long *)regs->ARM_sp; + long index = insn & 0xff; + int rt = (insn >> 8) & 0x7; + if (insn & 0x800) /* LDR */ + regs->uregs[rt] = base[index]; + else /* STR */ + base[index] = regs->uregs[rt]; +} + +static void __kprobes +t16_simulate_reladr(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + unsigned long base = (insn & 0x800) ? regs->ARM_sp + : ((regs->ARM_pc + 2) & ~3); + long offset = insn & 0xff; + int rt = (insn >> 8) & 0x7; + regs->uregs[rt] = base + offset * 4; +} + +static void __kprobes +t16_simulate_add_sp_imm(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + long imm = insn & 0x7f; + if (insn & 0x80) /* SUB */ + regs->ARM_sp -= imm * 4; + else /* ADD */ + regs->ARM_sp += imm * 4; +} + +static void __kprobes +t16_simulate_cbz(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + int rn = insn & 0x7; + probes_opcode_t nonzero = regs->uregs[rn] ? insn : ~insn; + if (nonzero & 0x800) { + long i = insn & 0x200; + long imm5 = insn & 0xf8; + unsigned long pc = regs->ARM_pc + 2; + regs->ARM_pc = pc + (i >> 3) + (imm5 >> 2); + } +} + +static void __kprobes +t16_simulate_it(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + /* + * The 8 IT state bits are split into two parts in CPSR: + * ITSTATE<1:0> are in CPSR<26:25> + * ITSTATE<7:2> are in CPSR<15:10> + * The new IT state is in the lower byte of insn. + */ + unsigned long cpsr = regs->ARM_cpsr; + cpsr &= ~PSR_IT_MASK; + cpsr |= (insn & 0xfc) << 8; + cpsr |= (insn & 0x03) << 25; + regs->ARM_cpsr = cpsr; +} + +static void __kprobes +t16_singlestep_it(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + regs->ARM_pc += 2; + t16_simulate_it(insn, asi, regs); +} + +static enum probes_insn __kprobes +t16_decode_it(probes_opcode_t insn, struct arch_probes_insn *asi, + const struct decode_header *d) +{ + asi->insn_singlestep = t16_singlestep_it; + return INSN_GOOD_NO_SLOT; +} + +static void __kprobes +t16_simulate_cond_branch(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + unsigned long pc = regs->ARM_pc + 2; + long offset = insn & 0x7f; + offset -= insn & 0x80; /* Apply sign bit */ + regs->ARM_pc = pc + (offset * 2); +} + +static enum probes_insn __kprobes +t16_decode_cond_branch(probes_opcode_t insn, struct arch_probes_insn *asi, + const struct decode_header *d) +{ + int cc = (insn >> 8) & 0xf; + asi->insn_check_cc = probes_condition_checks[cc]; + asi->insn_handler = t16_simulate_cond_branch; + return INSN_GOOD_NO_SLOT; +} + +static void __kprobes +t16_simulate_branch(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + unsigned long pc = regs->ARM_pc + 2; + long offset = insn & 0x3ff; + offset -= insn & 0x400; /* Apply sign bit */ + regs->ARM_pc = pc + (offset * 2); +} + +static unsigned long __kprobes +t16_emulate_loregs(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + unsigned long oldcpsr = regs->ARM_cpsr; + unsigned long newcpsr; + + __asm__ __volatile__ ( + "msr cpsr_fs, %[oldcpsr] \n\t" + "mov r11, r7 \n\t" + "ldmia %[regs], {r0-r7} \n\t" + "blx %[fn] \n\t" + "stmia %[regs], {r0-r7} \n\t" + "mov r7, r11 \n\t" + "mrs %[newcpsr], cpsr \n\t" + : [newcpsr] "=r" (newcpsr) + : [oldcpsr] "r" (oldcpsr), [regs] "r" (regs), + [fn] "r" (asi->insn_fn) + : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r11", + "lr", "memory", "cc" + ); + + return (oldcpsr & ~APSR_MASK) | (newcpsr & APSR_MASK); +} + +static void __kprobes +t16_emulate_loregs_rwflags(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + regs->ARM_cpsr = t16_emulate_loregs(insn, asi, regs); +} + +static void __kprobes +t16_emulate_loregs_noitrwflags(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + unsigned long cpsr = t16_emulate_loregs(insn, asi, regs); + if (!in_it_block(cpsr)) + regs->ARM_cpsr = cpsr; +} + +static void __kprobes +t16_emulate_hiregs(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + unsigned long pc = regs->ARM_pc + 2; + int rdn = (insn & 0x7) | ((insn & 0x80) >> 4); + int rm = (insn >> 3) & 0xf; + + register unsigned long rdnv asm("r1"); + register unsigned long rmv asm("r0"); + unsigned long cpsr = regs->ARM_cpsr; + + rdnv = (rdn == 15) ? pc : regs->uregs[rdn]; + rmv = (rm == 15) ? pc : regs->uregs[rm]; + + __asm__ __volatile__ ( + "msr cpsr_fs, %[cpsr] \n\t" + "blx %[fn] \n\t" + "mrs %[cpsr], cpsr \n\t" + : "=r" (rdnv), [cpsr] "=r" (cpsr) + : "0" (rdnv), "r" (rmv), "1" (cpsr), [fn] "r" (asi->insn_fn) + : "lr", "memory", "cc" + ); + + if (rdn == 15) + rdnv &= ~1; + + regs->uregs[rdn] = rdnv; + regs->ARM_cpsr = (regs->ARM_cpsr & ~APSR_MASK) | (cpsr & APSR_MASK); +} + +static enum probes_insn __kprobes +t16_decode_hiregs(probes_opcode_t insn, struct arch_probes_insn *asi, + const struct decode_header *d) +{ + insn &= ~0x00ff; + insn |= 0x001; /* Set Rdn = R1 and Rm = R0 */ + ((u16 *)asi->insn)[0] = __opcode_to_mem_thumb16(insn); + asi->insn_handler = t16_emulate_hiregs; + return INSN_GOOD; +} + +static void __kprobes +t16_emulate_push(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + __asm__ __volatile__ ( + "mov r11, r7 \n\t" + "ldr r9, [%[regs], #13*4] \n\t" + "ldr r8, [%[regs], #14*4] \n\t" + "ldmia %[regs], {r0-r7} \n\t" + "blx %[fn] \n\t" + "str r9, [%[regs], #13*4] \n\t" + "mov r7, r11 \n\t" + : + : [regs] "r" (regs), [fn] "r" (asi->insn_fn) + : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r8", "r9", "r11", + "lr", "memory", "cc" + ); +} + +static enum probes_insn __kprobes +t16_decode_push(probes_opcode_t insn, struct arch_probes_insn *asi, + const struct decode_header *d) +{ + /* + * To simulate a PUSH we use a Thumb-2 "STMDB R9!, {registers}" + * and call it with R9=SP and LR in the register list represented + * by R8. + */ + /* 1st half STMDB R9!,{} */ + ((u16 *)asi->insn)[0] = __opcode_to_mem_thumb16(0xe929); + /* 2nd half (register list) */ + ((u16 *)asi->insn)[1] = __opcode_to_mem_thumb16(insn & 0x1ff); + asi->insn_handler = t16_emulate_push; + return INSN_GOOD; +} + +static void __kprobes +t16_emulate_pop_nopc(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + __asm__ __volatile__ ( + "mov r11, r7 \n\t" + "ldr r9, [%[regs], #13*4] \n\t" + "ldmia %[regs], {r0-r7} \n\t" + "blx %[fn] \n\t" + "stmia %[regs], {r0-r7} \n\t" + "str r9, [%[regs], #13*4] \n\t" + "mov r7, r11 \n\t" + : + : [regs] "r" (regs), [fn] "r" (asi->insn_fn) + : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r9", "r11", + "lr", "memory", "cc" + ); +} + +static void __kprobes +t16_emulate_pop_pc(probes_opcode_t insn, + struct arch_probes_insn *asi, struct pt_regs *regs) +{ + register unsigned long pc asm("r8"); + + __asm__ __volatile__ ( + "mov r11, r7 \n\t" + "ldr r9, [%[regs], #13*4] \n\t" + "ldmia %[regs], {r0-r7} \n\t" + "blx %[fn] \n\t" + "stmia %[regs], {r0-r7} \n\t" + "str r9, [%[regs], #13*4] \n\t" + "mov r7, r11 \n\t" + : "=r" (pc) + : [regs] "r" (regs), [fn] "r" (asi->insn_fn) + : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r9", "r11", + "lr", "memory", "cc" + ); + + bx_write_pc(pc, regs); +} + +static enum probes_insn __kprobes +t16_decode_pop(probes_opcode_t insn, struct arch_probes_insn *asi, + const struct decode_header *d) +{ + /* + * To simulate a POP we use a Thumb-2 "LDMDB R9!, {registers}" + * and call it with R9=SP and PC in the register list represented + * by R8. + */ + /* 1st half LDMIA R9!,{} */ + ((u16 *)asi->insn)[0] = __opcode_to_mem_thumb16(0xe8b9); + /* 2nd half (register list) */ + ((u16 *)asi->insn)[1] = __opcode_to_mem_thumb16(insn & 0x1ff); + asi->insn_handler = insn & 0x100 ? t16_emulate_pop_pc + : t16_emulate_pop_nopc; + return INSN_GOOD; +} + +const union decode_action kprobes_t16_actions[NUM_PROBES_T16_ACTIONS] = { + [PROBES_T16_ADD_SP] = {.handler = t16_simulate_add_sp_imm}, + [PROBES_T16_CBZ] = {.handler = t16_simulate_cbz}, + [PROBES_T16_SIGN_EXTEND] = {.handler = t16_emulate_loregs_rwflags}, + [PROBES_T16_PUSH] = {.decoder = t16_decode_push}, + [PROBES_T16_POP] = {.decoder = t16_decode_pop}, + [PROBES_T16_SEV] = {.handler = probes_emulate_none}, + [PROBES_T16_WFE] = {.handler = probes_simulate_nop}, + [PROBES_T16_IT] = {.decoder = t16_decode_it}, + [PROBES_T16_CMP] = {.handler = t16_emulate_loregs_rwflags}, + [PROBES_T16_ADDSUB] = {.handler = t16_emulate_loregs_noitrwflags}, + [PROBES_T16_LOGICAL] = {.handler = t16_emulate_loregs_noitrwflags}, + [PROBES_T16_LDR_LIT] = {.handler = t16_simulate_ldr_literal}, + [PROBES_T16_BLX] = {.handler = t16_simulate_bxblx}, + [PROBES_T16_HIREGOPS] = {.decoder = t16_decode_hiregs}, + [PROBES_T16_LDRHSTRH] = {.handler = t16_emulate_loregs_rwflags}, + [PROBES_T16_LDRSTR] = {.handler = t16_simulate_ldrstr_sp_relative}, + [PROBES_T16_ADR] = {.handler = t16_simulate_reladr}, + [PROBES_T16_LDMSTM] = {.handler = t16_emulate_loregs_rwflags}, + [PROBES_T16_BRANCH_COND] = {.decoder = t16_decode_cond_branch}, + [PROBES_T16_BRANCH] = {.handler = t16_simulate_branch}, +}; + +const union decode_action kprobes_t32_actions[NUM_PROBES_T32_ACTIONS] = { + [PROBES_T32_LDMSTM] = {.decoder = t32_decode_ldmstm}, + [PROBES_T32_LDRDSTRD] = {.handler = t32_emulate_ldrdstrd}, + [PROBES_T32_TABLE_BRANCH] = {.handler = t32_simulate_table_branch}, + [PROBES_T32_TST] = {.handler = t32_emulate_rd8rn16rm0_rwflags}, + [PROBES_T32_MOV] = {.handler = t32_emulate_rd8rn16rm0_rwflags}, + [PROBES_T32_ADDSUB] = {.handler = t32_emulate_rd8rn16rm0_rwflags}, + [PROBES_T32_LOGICAL] = {.handler = t32_emulate_rd8rn16rm0_rwflags}, + [PROBES_T32_CMP] = {.handler = t32_emulate_rd8rn16rm0_rwflags}, + [PROBES_T32_ADDWSUBW_PC] = {.handler = t32_emulate_rd8pc16_noflags,}, + [PROBES_T32_ADDWSUBW] = {.handler = t32_emulate_rd8rn16_noflags}, + [PROBES_T32_MOVW] = {.handler = t32_emulate_rd8rn16_noflags}, + [PROBES_T32_SAT] = {.handler = t32_emulate_rd8rn16rm0_rwflags}, + [PROBES_T32_BITFIELD] = {.handler = t32_emulate_rd8rn16_noflags}, + [PROBES_T32_SEV] = {.handler = probes_emulate_none}, + [PROBES_T32_WFE] = {.handler = probes_simulate_nop}, + [PROBES_T32_MRS] = {.handler = t32_simulate_mrs}, + [PROBES_T32_BRANCH_COND] = {.decoder = t32_decode_cond_branch}, + [PROBES_T32_BRANCH] = {.handler = t32_simulate_branch}, + [PROBES_T32_PLDI] = {.handler = probes_simulate_nop}, + [PROBES_T32_LDR_LIT] = {.handler = t32_simulate_ldr_literal}, + [PROBES_T32_LDRSTR] = {.handler = t32_emulate_ldrstr}, + [PROBES_T32_SIGN_EXTEND] = {.handler = t32_emulate_rd8rn16rm0_rwflags}, + [PROBES_T32_MEDIA] = {.handler = t32_emulate_rd8rn16rm0_rwflags}, + [PROBES_T32_REVERSE] = {.handler = t32_emulate_rd8rn16_noflags}, + [PROBES_T32_MUL_ADD] = {.handler = t32_emulate_rd8rn16rm0_rwflags}, + [PROBES_T32_MUL_ADD2] = {.handler = t32_emulate_rd8rn16rm0ra12_noflags}, + [PROBES_T32_MUL_ADD_LONG] = { + .handler = t32_emulate_rdlo12rdhi8rn16rm0_noflags}, +}; + +const struct decode_checker *kprobes_t32_checkers[] = {t32_stack_checker, NULL}; +const struct decode_checker *kprobes_t16_checkers[] = {t16_stack_checker, NULL}; -- cgit v1.2.3