mirror of https://gitee.com/openkylin/linux.git
826 lines
23 KiB
C
826 lines
23 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* rseq-arm.h
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*
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* (C) Copyright 2016-2018 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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*/
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/*
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* - ARM little endian
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*
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* RSEQ_SIG uses the udf A32 instruction with an uncommon immediate operand
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* value 0x5de3. This traps if user-space reaches this instruction by mistake,
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* and the uncommon operand ensures the kernel does not move the instruction
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* pointer to attacker-controlled code on rseq abort.
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*
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* The instruction pattern in the A32 instruction set is:
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*
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* e7f5def3 udf #24035 ; 0x5de3
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*
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* This translates to the following instruction pattern in the T16 instruction
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* set:
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*
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* little endian:
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* def3 udf #243 ; 0xf3
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* e7f5 b.n <7f5>
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*
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* - ARMv6+ big endian (BE8):
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*
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* ARMv6+ -mbig-endian generates mixed endianness code vs data: little-endian
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* code and big-endian data. The data value of the signature needs to have its
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* byte order reversed to generate the trap instruction:
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*
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* Data: 0xf3def5e7
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*
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* Translates to this A32 instruction pattern:
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*
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* e7f5def3 udf #24035 ; 0x5de3
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*
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* Translates to this T16 instruction pattern:
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*
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* def3 udf #243 ; 0xf3
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* e7f5 b.n <7f5>
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*
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* - Prior to ARMv6 big endian (BE32):
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*
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* Prior to ARMv6, -mbig-endian generates big-endian code and data
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* (which match), so the endianness of the data representation of the
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* signature should not be reversed. However, the choice between BE32
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* and BE8 is done by the linker, so we cannot know whether code and
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* data endianness will be mixed before the linker is invoked. So rather
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* than try to play tricks with the linker, the rseq signature is simply
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* data (not a trap instruction) prior to ARMv6 on big endian. This is
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* why the signature is expressed as data (.word) rather than as
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* instruction (.inst) in assembler.
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*/
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#ifdef __ARMEB__
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#define RSEQ_SIG 0xf3def5e7 /* udf #24035 ; 0x5de3 (ARMv6+) */
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#else
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#define RSEQ_SIG 0xe7f5def3 /* udf #24035 ; 0x5de3 */
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#endif
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#define rseq_smp_mb() __asm__ __volatile__ ("dmb" ::: "memory", "cc")
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#define rseq_smp_rmb() __asm__ __volatile__ ("dmb" ::: "memory", "cc")
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#define rseq_smp_wmb() __asm__ __volatile__ ("dmb" ::: "memory", "cc")
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#define rseq_smp_load_acquire(p) \
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__extension__ ({ \
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__typeof(*p) ____p1 = RSEQ_READ_ONCE(*p); \
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rseq_smp_mb(); \
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____p1; \
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})
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#define rseq_smp_acquire__after_ctrl_dep() rseq_smp_rmb()
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#define rseq_smp_store_release(p, v) \
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do { \
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rseq_smp_mb(); \
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RSEQ_WRITE_ONCE(*p, v); \
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} while (0)
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#ifdef RSEQ_SKIP_FASTPATH
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#include "rseq-skip.h"
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#else /* !RSEQ_SKIP_FASTPATH */
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#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, start_ip, \
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post_commit_offset, abort_ip) \
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".pushsection __rseq_cs, \"aw\"\n\t" \
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".balign 32\n\t" \
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__rseq_str(label) ":\n\t" \
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".word " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
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".word " __rseq_str(start_ip) ", 0x0, " __rseq_str(post_commit_offset) ", 0x0, " __rseq_str(abort_ip) ", 0x0\n\t" \
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".popsection\n\t" \
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".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
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".word " __rseq_str(label) "b, 0x0\n\t" \
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".popsection\n\t"
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#define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip) \
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__RSEQ_ASM_DEFINE_TABLE(label, 0x0, 0x0, start_ip, \
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(post_commit_ip - start_ip), abort_ip)
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/*
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* Exit points of a rseq critical section consist of all instructions outside
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* of the critical section where a critical section can either branch to or
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* reach through the normal course of its execution. The abort IP and the
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* post-commit IP are already part of the __rseq_cs section and should not be
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* explicitly defined as additional exit points. Knowing all exit points is
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* useful to assist debuggers stepping over the critical section.
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*/
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#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \
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".pushsection __rseq_exit_point_array, \"aw\"\n\t" \
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".word " __rseq_str(start_ip) ", 0x0, " __rseq_str(exit_ip) ", 0x0\n\t" \
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".popsection\n\t"
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#define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \
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RSEQ_INJECT_ASM(1) \
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"adr r0, " __rseq_str(cs_label) "\n\t" \
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"str r0, %[" __rseq_str(rseq_cs) "]\n\t" \
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__rseq_str(label) ":\n\t"
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#define RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, label) \
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RSEQ_INJECT_ASM(2) \
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"ldr r0, %[" __rseq_str(current_cpu_id) "]\n\t" \
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"cmp %[" __rseq_str(cpu_id) "], r0\n\t" \
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"bne " __rseq_str(label) "\n\t"
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#define __RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown, \
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abort_label, version, flags, \
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start_ip, post_commit_offset, abort_ip) \
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".balign 32\n\t" \
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__rseq_str(table_label) ":\n\t" \
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".word " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
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".word " __rseq_str(start_ip) ", 0x0, " __rseq_str(post_commit_offset) ", 0x0, " __rseq_str(abort_ip) ", 0x0\n\t" \
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".word " __rseq_str(RSEQ_SIG) "\n\t" \
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__rseq_str(label) ":\n\t" \
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teardown \
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"b %l[" __rseq_str(abort_label) "]\n\t"
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#define RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown, abort_label, \
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start_ip, post_commit_ip, abort_ip) \
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__RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown, \
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abort_label, 0x0, 0x0, start_ip, \
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(post_commit_ip - start_ip), abort_ip)
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#define RSEQ_ASM_DEFINE_CMPFAIL(label, teardown, cmpfail_label) \
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__rseq_str(label) ":\n\t" \
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teardown \
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"b %l[" __rseq_str(cmpfail_label) "]\n\t"
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#define rseq_workaround_gcc_asm_size_guess() __asm__ __volatile__("")
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static inline __attribute__((always_inline))
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int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu)
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{
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RSEQ_INJECT_C(9)
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rseq_workaround_gcc_asm_size_guess();
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__asm__ __volatile__ goto (
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RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
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#ifdef RSEQ_COMPARE_TWICE
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
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#endif
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/* Start rseq by storing table entry pointer into rseq_cs. */
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RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
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RSEQ_INJECT_ASM(3)
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"ldr r0, %[v]\n\t"
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"cmp %[expect], r0\n\t"
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"bne %l[cmpfail]\n\t"
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RSEQ_INJECT_ASM(4)
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#ifdef RSEQ_COMPARE_TWICE
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
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"ldr r0, %[v]\n\t"
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"cmp %[expect], r0\n\t"
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"bne %l[error2]\n\t"
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#endif
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/* final store */
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"str %[newv], %[v]\n\t"
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"2:\n\t"
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RSEQ_INJECT_ASM(5)
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"b 5f\n\t"
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RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
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"5:\n\t"
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: /* gcc asm goto does not allow outputs */
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: [cpu_id] "r" (cpu),
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[current_cpu_id] "m" (__rseq_abi.cpu_id),
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[rseq_cs] "m" (__rseq_abi.rseq_cs),
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[v] "m" (*v),
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[expect] "r" (expect),
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[newv] "r" (newv)
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RSEQ_INJECT_INPUT
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: "r0", "memory", "cc"
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RSEQ_INJECT_CLOBBER
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: abort, cmpfail
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#ifdef RSEQ_COMPARE_TWICE
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, error1, error2
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#endif
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);
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rseq_workaround_gcc_asm_size_guess();
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return 0;
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abort:
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rseq_workaround_gcc_asm_size_guess();
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RSEQ_INJECT_FAILED
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return -1;
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cmpfail:
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rseq_workaround_gcc_asm_size_guess();
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return 1;
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#ifdef RSEQ_COMPARE_TWICE
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error1:
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rseq_bug("cpu_id comparison failed");
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error2:
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rseq_bug("expected value comparison failed");
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#endif
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}
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static inline __attribute__((always_inline))
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int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,
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off_t voffp, intptr_t *load, int cpu)
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{
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RSEQ_INJECT_C(9)
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rseq_workaround_gcc_asm_size_guess();
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__asm__ __volatile__ goto (
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RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
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#ifdef RSEQ_COMPARE_TWICE
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
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#endif
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/* Start rseq by storing table entry pointer into rseq_cs. */
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RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
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RSEQ_INJECT_ASM(3)
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"ldr r0, %[v]\n\t"
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"cmp %[expectnot], r0\n\t"
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"beq %l[cmpfail]\n\t"
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RSEQ_INJECT_ASM(4)
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#ifdef RSEQ_COMPARE_TWICE
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
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"ldr r0, %[v]\n\t"
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"cmp %[expectnot], r0\n\t"
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"beq %l[error2]\n\t"
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#endif
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"str r0, %[load]\n\t"
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"add r0, %[voffp]\n\t"
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"ldr r0, [r0]\n\t"
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/* final store */
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"str r0, %[v]\n\t"
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"2:\n\t"
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RSEQ_INJECT_ASM(5)
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"b 5f\n\t"
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RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
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"5:\n\t"
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: /* gcc asm goto does not allow outputs */
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: [cpu_id] "r" (cpu),
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[current_cpu_id] "m" (__rseq_abi.cpu_id),
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[rseq_cs] "m" (__rseq_abi.rseq_cs),
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/* final store input */
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[v] "m" (*v),
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[expectnot] "r" (expectnot),
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[voffp] "Ir" (voffp),
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[load] "m" (*load)
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RSEQ_INJECT_INPUT
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: "r0", "memory", "cc"
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RSEQ_INJECT_CLOBBER
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: abort, cmpfail
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#ifdef RSEQ_COMPARE_TWICE
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, error1, error2
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#endif
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);
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rseq_workaround_gcc_asm_size_guess();
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return 0;
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abort:
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rseq_workaround_gcc_asm_size_guess();
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RSEQ_INJECT_FAILED
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return -1;
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cmpfail:
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rseq_workaround_gcc_asm_size_guess();
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return 1;
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#ifdef RSEQ_COMPARE_TWICE
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error1:
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rseq_bug("cpu_id comparison failed");
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error2:
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rseq_bug("expected value comparison failed");
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#endif
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}
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static inline __attribute__((always_inline))
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int rseq_addv(intptr_t *v, intptr_t count, int cpu)
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{
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RSEQ_INJECT_C(9)
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rseq_workaround_gcc_asm_size_guess();
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__asm__ __volatile__ goto (
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RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
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#ifdef RSEQ_COMPARE_TWICE
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
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#endif
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/* Start rseq by storing table entry pointer into rseq_cs. */
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RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
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RSEQ_INJECT_ASM(3)
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#ifdef RSEQ_COMPARE_TWICE
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
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#endif
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"ldr r0, %[v]\n\t"
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"add r0, %[count]\n\t"
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/* final store */
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"str r0, %[v]\n\t"
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"2:\n\t"
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RSEQ_INJECT_ASM(4)
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"b 5f\n\t"
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RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
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"5:\n\t"
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: /* gcc asm goto does not allow outputs */
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: [cpu_id] "r" (cpu),
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[current_cpu_id] "m" (__rseq_abi.cpu_id),
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[rseq_cs] "m" (__rseq_abi.rseq_cs),
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[v] "m" (*v),
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[count] "Ir" (count)
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RSEQ_INJECT_INPUT
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: "r0", "memory", "cc"
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RSEQ_INJECT_CLOBBER
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: abort
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#ifdef RSEQ_COMPARE_TWICE
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, error1
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#endif
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);
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rseq_workaround_gcc_asm_size_guess();
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return 0;
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abort:
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rseq_workaround_gcc_asm_size_guess();
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RSEQ_INJECT_FAILED
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return -1;
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#ifdef RSEQ_COMPARE_TWICE
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error1:
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rseq_bug("cpu_id comparison failed");
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#endif
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}
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static inline __attribute__((always_inline))
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int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect,
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intptr_t *v2, intptr_t newv2,
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intptr_t newv, int cpu)
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{
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RSEQ_INJECT_C(9)
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rseq_workaround_gcc_asm_size_guess();
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__asm__ __volatile__ goto (
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RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
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#ifdef RSEQ_COMPARE_TWICE
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
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RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
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#endif
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/* Start rseq by storing table entry pointer into rseq_cs. */
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RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
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RSEQ_INJECT_ASM(3)
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"ldr r0, %[v]\n\t"
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"cmp %[expect], r0\n\t"
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"bne %l[cmpfail]\n\t"
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RSEQ_INJECT_ASM(4)
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#ifdef RSEQ_COMPARE_TWICE
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RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
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"ldr r0, %[v]\n\t"
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"cmp %[expect], r0\n\t"
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"bne %l[error2]\n\t"
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#endif
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/* try store */
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"str %[newv2], %[v2]\n\t"
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RSEQ_INJECT_ASM(5)
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/* final store */
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"str %[newv], %[v]\n\t"
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"2:\n\t"
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RSEQ_INJECT_ASM(6)
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"b 5f\n\t"
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RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
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"5:\n\t"
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: /* gcc asm goto does not allow outputs */
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: [cpu_id] "r" (cpu),
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[current_cpu_id] "m" (__rseq_abi.cpu_id),
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[rseq_cs] "m" (__rseq_abi.rseq_cs),
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/* try store input */
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[v2] "m" (*v2),
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[newv2] "r" (newv2),
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/* final store input */
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[v] "m" (*v),
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[expect] "r" (expect),
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[newv] "r" (newv)
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RSEQ_INJECT_INPUT
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: "r0", "memory", "cc"
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RSEQ_INJECT_CLOBBER
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: abort, cmpfail
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#ifdef RSEQ_COMPARE_TWICE
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, error1, error2
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#endif
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);
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rseq_workaround_gcc_asm_size_guess();
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return 0;
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abort:
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rseq_workaround_gcc_asm_size_guess();
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RSEQ_INJECT_FAILED
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return -1;
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cmpfail:
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rseq_workaround_gcc_asm_size_guess();
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return 1;
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#ifdef RSEQ_COMPARE_TWICE
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error1:
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rseq_bug("cpu_id comparison failed");
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error2:
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rseq_bug("expected value comparison failed");
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#endif
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}
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static inline __attribute__((always_inline))
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int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect,
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intptr_t *v2, intptr_t newv2,
|
|
intptr_t newv, int cpu)
|
|
{
|
|
RSEQ_INJECT_C(9)
|
|
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
__asm__ __volatile__ goto (
|
|
RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
|
|
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
|
|
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
|
|
#endif
|
|
/* Start rseq by storing table entry pointer into rseq_cs. */
|
|
RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
|
RSEQ_INJECT_ASM(3)
|
|
"ldr r0, %[v]\n\t"
|
|
"cmp %[expect], r0\n\t"
|
|
"bne %l[cmpfail]\n\t"
|
|
RSEQ_INJECT_ASM(4)
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
|
|
"ldr r0, %[v]\n\t"
|
|
"cmp %[expect], r0\n\t"
|
|
"bne %l[error2]\n\t"
|
|
#endif
|
|
/* try store */
|
|
"str %[newv2], %[v2]\n\t"
|
|
RSEQ_INJECT_ASM(5)
|
|
"dmb\n\t" /* full mb provides store-release */
|
|
/* final store */
|
|
"str %[newv], %[v]\n\t"
|
|
"2:\n\t"
|
|
RSEQ_INJECT_ASM(6)
|
|
"b 5f\n\t"
|
|
RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
|
|
"5:\n\t"
|
|
: /* gcc asm goto does not allow outputs */
|
|
: [cpu_id] "r" (cpu),
|
|
[current_cpu_id] "m" (__rseq_abi.cpu_id),
|
|
[rseq_cs] "m" (__rseq_abi.rseq_cs),
|
|
/* try store input */
|
|
[v2] "m" (*v2),
|
|
[newv2] "r" (newv2),
|
|
/* final store input */
|
|
[v] "m" (*v),
|
|
[expect] "r" (expect),
|
|
[newv] "r" (newv)
|
|
RSEQ_INJECT_INPUT
|
|
: "r0", "memory", "cc"
|
|
RSEQ_INJECT_CLOBBER
|
|
: abort, cmpfail
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
, error1, error2
|
|
#endif
|
|
);
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
return 0;
|
|
abort:
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
RSEQ_INJECT_FAILED
|
|
return -1;
|
|
cmpfail:
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
return 1;
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
error1:
|
|
rseq_bug("cpu_id comparison failed");
|
|
error2:
|
|
rseq_bug("expected value comparison failed");
|
|
#endif
|
|
}
|
|
|
|
static inline __attribute__((always_inline))
|
|
int rseq_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect,
|
|
intptr_t *v2, intptr_t expect2,
|
|
intptr_t newv, int cpu)
|
|
{
|
|
RSEQ_INJECT_C(9)
|
|
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
__asm__ __volatile__ goto (
|
|
RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
|
|
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
|
|
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
|
|
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error3])
|
|
#endif
|
|
/* Start rseq by storing table entry pointer into rseq_cs. */
|
|
RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
|
RSEQ_INJECT_ASM(3)
|
|
"ldr r0, %[v]\n\t"
|
|
"cmp %[expect], r0\n\t"
|
|
"bne %l[cmpfail]\n\t"
|
|
RSEQ_INJECT_ASM(4)
|
|
"ldr r0, %[v2]\n\t"
|
|
"cmp %[expect2], r0\n\t"
|
|
"bne %l[cmpfail]\n\t"
|
|
RSEQ_INJECT_ASM(5)
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
|
|
"ldr r0, %[v]\n\t"
|
|
"cmp %[expect], r0\n\t"
|
|
"bne %l[error2]\n\t"
|
|
"ldr r0, %[v2]\n\t"
|
|
"cmp %[expect2], r0\n\t"
|
|
"bne %l[error3]\n\t"
|
|
#endif
|
|
/* final store */
|
|
"str %[newv], %[v]\n\t"
|
|
"2:\n\t"
|
|
RSEQ_INJECT_ASM(6)
|
|
"b 5f\n\t"
|
|
RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f)
|
|
"5:\n\t"
|
|
: /* gcc asm goto does not allow outputs */
|
|
: [cpu_id] "r" (cpu),
|
|
[current_cpu_id] "m" (__rseq_abi.cpu_id),
|
|
[rseq_cs] "m" (__rseq_abi.rseq_cs),
|
|
/* cmp2 input */
|
|
[v2] "m" (*v2),
|
|
[expect2] "r" (expect2),
|
|
/* final store input */
|
|
[v] "m" (*v),
|
|
[expect] "r" (expect),
|
|
[newv] "r" (newv)
|
|
RSEQ_INJECT_INPUT
|
|
: "r0", "memory", "cc"
|
|
RSEQ_INJECT_CLOBBER
|
|
: abort, cmpfail
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
, error1, error2, error3
|
|
#endif
|
|
);
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
return 0;
|
|
abort:
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
RSEQ_INJECT_FAILED
|
|
return -1;
|
|
cmpfail:
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
return 1;
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
error1:
|
|
rseq_bug("cpu_id comparison failed");
|
|
error2:
|
|
rseq_bug("1st expected value comparison failed");
|
|
error3:
|
|
rseq_bug("2nd expected value comparison failed");
|
|
#endif
|
|
}
|
|
|
|
static inline __attribute__((always_inline))
|
|
int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect,
|
|
void *dst, void *src, size_t len,
|
|
intptr_t newv, int cpu)
|
|
{
|
|
uint32_t rseq_scratch[3];
|
|
|
|
RSEQ_INJECT_C(9)
|
|
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
__asm__ __volatile__ goto (
|
|
RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
|
|
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
|
|
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
|
|
#endif
|
|
"str %[src], %[rseq_scratch0]\n\t"
|
|
"str %[dst], %[rseq_scratch1]\n\t"
|
|
"str %[len], %[rseq_scratch2]\n\t"
|
|
/* Start rseq by storing table entry pointer into rseq_cs. */
|
|
RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
|
RSEQ_INJECT_ASM(3)
|
|
"ldr r0, %[v]\n\t"
|
|
"cmp %[expect], r0\n\t"
|
|
"bne 5f\n\t"
|
|
RSEQ_INJECT_ASM(4)
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 6f)
|
|
"ldr r0, %[v]\n\t"
|
|
"cmp %[expect], r0\n\t"
|
|
"bne 7f\n\t"
|
|
#endif
|
|
/* try memcpy */
|
|
"cmp %[len], #0\n\t" \
|
|
"beq 333f\n\t" \
|
|
"222:\n\t" \
|
|
"ldrb %%r0, [%[src]]\n\t" \
|
|
"strb %%r0, [%[dst]]\n\t" \
|
|
"adds %[src], #1\n\t" \
|
|
"adds %[dst], #1\n\t" \
|
|
"subs %[len], #1\n\t" \
|
|
"bne 222b\n\t" \
|
|
"333:\n\t" \
|
|
RSEQ_INJECT_ASM(5)
|
|
/* final store */
|
|
"str %[newv], %[v]\n\t"
|
|
"2:\n\t"
|
|
RSEQ_INJECT_ASM(6)
|
|
/* teardown */
|
|
"ldr %[len], %[rseq_scratch2]\n\t"
|
|
"ldr %[dst], %[rseq_scratch1]\n\t"
|
|
"ldr %[src], %[rseq_scratch0]\n\t"
|
|
"b 8f\n\t"
|
|
RSEQ_ASM_DEFINE_ABORT(3, 4,
|
|
/* teardown */
|
|
"ldr %[len], %[rseq_scratch2]\n\t"
|
|
"ldr %[dst], %[rseq_scratch1]\n\t"
|
|
"ldr %[src], %[rseq_scratch0]\n\t",
|
|
abort, 1b, 2b, 4f)
|
|
RSEQ_ASM_DEFINE_CMPFAIL(5,
|
|
/* teardown */
|
|
"ldr %[len], %[rseq_scratch2]\n\t"
|
|
"ldr %[dst], %[rseq_scratch1]\n\t"
|
|
"ldr %[src], %[rseq_scratch0]\n\t",
|
|
cmpfail)
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
RSEQ_ASM_DEFINE_CMPFAIL(6,
|
|
/* teardown */
|
|
"ldr %[len], %[rseq_scratch2]\n\t"
|
|
"ldr %[dst], %[rseq_scratch1]\n\t"
|
|
"ldr %[src], %[rseq_scratch0]\n\t",
|
|
error1)
|
|
RSEQ_ASM_DEFINE_CMPFAIL(7,
|
|
/* teardown */
|
|
"ldr %[len], %[rseq_scratch2]\n\t"
|
|
"ldr %[dst], %[rseq_scratch1]\n\t"
|
|
"ldr %[src], %[rseq_scratch0]\n\t",
|
|
error2)
|
|
#endif
|
|
"8:\n\t"
|
|
: /* gcc asm goto does not allow outputs */
|
|
: [cpu_id] "r" (cpu),
|
|
[current_cpu_id] "m" (__rseq_abi.cpu_id),
|
|
[rseq_cs] "m" (__rseq_abi.rseq_cs),
|
|
/* final store input */
|
|
[v] "m" (*v),
|
|
[expect] "r" (expect),
|
|
[newv] "r" (newv),
|
|
/* try memcpy input */
|
|
[dst] "r" (dst),
|
|
[src] "r" (src),
|
|
[len] "r" (len),
|
|
[rseq_scratch0] "m" (rseq_scratch[0]),
|
|
[rseq_scratch1] "m" (rseq_scratch[1]),
|
|
[rseq_scratch2] "m" (rseq_scratch[2])
|
|
RSEQ_INJECT_INPUT
|
|
: "r0", "memory", "cc"
|
|
RSEQ_INJECT_CLOBBER
|
|
: abort, cmpfail
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
, error1, error2
|
|
#endif
|
|
);
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
return 0;
|
|
abort:
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
RSEQ_INJECT_FAILED
|
|
return -1;
|
|
cmpfail:
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
return 1;
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
error1:
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
rseq_bug("cpu_id comparison failed");
|
|
error2:
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
rseq_bug("expected value comparison failed");
|
|
#endif
|
|
}
|
|
|
|
static inline __attribute__((always_inline))
|
|
int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
|
|
void *dst, void *src, size_t len,
|
|
intptr_t newv, int cpu)
|
|
{
|
|
uint32_t rseq_scratch[3];
|
|
|
|
RSEQ_INJECT_C(9)
|
|
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
__asm__ __volatile__ goto (
|
|
RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
|
|
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
|
|
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2])
|
|
#endif
|
|
"str %[src], %[rseq_scratch0]\n\t"
|
|
"str %[dst], %[rseq_scratch1]\n\t"
|
|
"str %[len], %[rseq_scratch2]\n\t"
|
|
/* Start rseq by storing table entry pointer into rseq_cs. */
|
|
RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs)
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
|
|
RSEQ_INJECT_ASM(3)
|
|
"ldr r0, %[v]\n\t"
|
|
"cmp %[expect], r0\n\t"
|
|
"bne 5f\n\t"
|
|
RSEQ_INJECT_ASM(4)
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 6f)
|
|
"ldr r0, %[v]\n\t"
|
|
"cmp %[expect], r0\n\t"
|
|
"bne 7f\n\t"
|
|
#endif
|
|
/* try memcpy */
|
|
"cmp %[len], #0\n\t" \
|
|
"beq 333f\n\t" \
|
|
"222:\n\t" \
|
|
"ldrb %%r0, [%[src]]\n\t" \
|
|
"strb %%r0, [%[dst]]\n\t" \
|
|
"adds %[src], #1\n\t" \
|
|
"adds %[dst], #1\n\t" \
|
|
"subs %[len], #1\n\t" \
|
|
"bne 222b\n\t" \
|
|
"333:\n\t" \
|
|
RSEQ_INJECT_ASM(5)
|
|
"dmb\n\t" /* full mb provides store-release */
|
|
/* final store */
|
|
"str %[newv], %[v]\n\t"
|
|
"2:\n\t"
|
|
RSEQ_INJECT_ASM(6)
|
|
/* teardown */
|
|
"ldr %[len], %[rseq_scratch2]\n\t"
|
|
"ldr %[dst], %[rseq_scratch1]\n\t"
|
|
"ldr %[src], %[rseq_scratch0]\n\t"
|
|
"b 8f\n\t"
|
|
RSEQ_ASM_DEFINE_ABORT(3, 4,
|
|
/* teardown */
|
|
"ldr %[len], %[rseq_scratch2]\n\t"
|
|
"ldr %[dst], %[rseq_scratch1]\n\t"
|
|
"ldr %[src], %[rseq_scratch0]\n\t",
|
|
abort, 1b, 2b, 4f)
|
|
RSEQ_ASM_DEFINE_CMPFAIL(5,
|
|
/* teardown */
|
|
"ldr %[len], %[rseq_scratch2]\n\t"
|
|
"ldr %[dst], %[rseq_scratch1]\n\t"
|
|
"ldr %[src], %[rseq_scratch0]\n\t",
|
|
cmpfail)
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
RSEQ_ASM_DEFINE_CMPFAIL(6,
|
|
/* teardown */
|
|
"ldr %[len], %[rseq_scratch2]\n\t"
|
|
"ldr %[dst], %[rseq_scratch1]\n\t"
|
|
"ldr %[src], %[rseq_scratch0]\n\t",
|
|
error1)
|
|
RSEQ_ASM_DEFINE_CMPFAIL(7,
|
|
/* teardown */
|
|
"ldr %[len], %[rseq_scratch2]\n\t"
|
|
"ldr %[dst], %[rseq_scratch1]\n\t"
|
|
"ldr %[src], %[rseq_scratch0]\n\t",
|
|
error2)
|
|
#endif
|
|
"8:\n\t"
|
|
: /* gcc asm goto does not allow outputs */
|
|
: [cpu_id] "r" (cpu),
|
|
[current_cpu_id] "m" (__rseq_abi.cpu_id),
|
|
[rseq_cs] "m" (__rseq_abi.rseq_cs),
|
|
/* final store input */
|
|
[v] "m" (*v),
|
|
[expect] "r" (expect),
|
|
[newv] "r" (newv),
|
|
/* try memcpy input */
|
|
[dst] "r" (dst),
|
|
[src] "r" (src),
|
|
[len] "r" (len),
|
|
[rseq_scratch0] "m" (rseq_scratch[0]),
|
|
[rseq_scratch1] "m" (rseq_scratch[1]),
|
|
[rseq_scratch2] "m" (rseq_scratch[2])
|
|
RSEQ_INJECT_INPUT
|
|
: "r0", "memory", "cc"
|
|
RSEQ_INJECT_CLOBBER
|
|
: abort, cmpfail
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
, error1, error2
|
|
#endif
|
|
);
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
return 0;
|
|
abort:
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
RSEQ_INJECT_FAILED
|
|
return -1;
|
|
cmpfail:
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
return 1;
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
error1:
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
rseq_bug("cpu_id comparison failed");
|
|
error2:
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
rseq_bug("expected value comparison failed");
|
|
#endif
|
|
}
|
|
|
|
#endif /* !RSEQ_SKIP_FASTPATH */
|