/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
/*
 * rseq-arm.h
 *
 * (C) Copyright 2016-2022 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

/*
 * - ARM little endian
 *
 * RSEQ_SIG uses the udf A32 instruction with an uncommon immediate operand
 * value 0x5de3. This traps if user-space reaches this instruction by mistake,
 * and the uncommon operand ensures the kernel does not move the instruction
 * pointer to attacker-controlled code on rseq abort.
 *
 * The instruction pattern in the A32 instruction set is:
 *
 * e7f5def3    udf    #24035    ; 0x5de3
 *
 * This translates to the following instruction pattern in the T16 instruction
 * set:
 *
 * little endian:
 * def3        udf    #243      ; 0xf3
 * e7f5        b.n    <7f5>
 *
 * - ARMv6+ big endian (BE8):
 *
 * ARMv6+ -mbig-endian generates mixed endianness code vs data: little-endian
 * code and big-endian data. The data value of the signature needs to have its
 * byte order reversed to generate the trap instruction:
 *
 * Data: 0xf3def5e7
 *
 * Translates to this A32 instruction pattern:
 *
 * e7f5def3    udf    #24035    ; 0x5de3
 *
 * Translates to this T16 instruction pattern:
 *
 * def3        udf    #243      ; 0xf3
 * e7f5        b.n    <7f5>
 *
 * - Prior to ARMv6 big endian (BE32):
 *
 * Prior to ARMv6, -mbig-endian generates big-endian code and data
 * (which match), so the endianness of the data representation of the
 * signature should not be reversed. However, the choice between BE32
 * and BE8 is done by the linker, so we cannot know whether code and
 * data endianness will be mixed before the linker is invoked. So rather
 * than try to play tricks with the linker, the rseq signature is simply
 * data (not a trap instruction) prior to ARMv6 on big endian. This is
 * why the signature is expressed as data (.word) rather than as
 * instruction (.inst) in assembler.
 */

#ifdef __ARMEB__
#define RSEQ_SIG    0xf3def5e7      /* udf    #24035    ; 0x5de3 (ARMv6+) */
#else
#define RSEQ_SIG    0xe7f5def3      /* udf    #24035    ; 0x5de3 */
#endif

#define rseq_smp_mb()   __asm__ __volatile__ ("dmb" ::: "memory", "cc")
#define rseq_smp_rmb()  __asm__ __volatile__ ("dmb" ::: "memory", "cc")
#define rseq_smp_wmb()  __asm__ __volatile__ ("dmb" ::: "memory", "cc")

#define rseq_smp_load_acquire(p)                                        \
__extension__ ({                                                        \
        rseq_unqual_scalar_typeof(*(p)) ____p1 = RSEQ_READ_ONCE(*(p));  \
        rseq_smp_mb();                                                  \
        ____p1;                                                         \
})

#define rseq_smp_acquire__after_ctrl_dep()      rseq_smp_rmb()

#define rseq_smp_store_release(p, v)                                    \
do {                                                                    \
        rseq_smp_mb();                                                  \
        RSEQ_WRITE_ONCE(*(p), v);                                       \
} while (0)

#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, start_ip,        \
                                post_commit_offset, abort_ip)           \
                ".pushsection __rseq_cs, \"aw\"\n\t"                    \
                ".balign 32\n\t"                                        \
                __rseq_str(label) ":\n\t"                                       \
                ".word " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
                ".word " __rseq_str(start_ip) ", 0x0, " __rseq_str(post_commit_offset) ", 0x0, " __rseq_str(abort_ip) ", 0x0\n\t" \
                ".popsection\n\t"                                       \
                ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t"          \
                ".word " __rseq_str(label) "b, 0x0\n\t"                 \
                ".popsection\n\t"

#define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip) \
        __RSEQ_ASM_DEFINE_TABLE(label, 0x0, 0x0, start_ip,              \
                                (post_commit_ip - start_ip), abort_ip)

/*
 * Exit points of a rseq critical section consist of all instructions outside
 * of the critical section where a critical section can either branch to or
 * reach through the normal course of its execution. The abort IP and the
 * post-commit IP are already part of the __rseq_cs section and should not be
 * explicitly defined as additional exit points. Knowing all exit points is
 * useful to assist debuggers stepping over the critical section.
 */
#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip)                   \
                ".pushsection __rseq_exit_point_array, \"aw\"\n\t"      \
                ".word " __rseq_str(start_ip) ", 0x0, " __rseq_str(exit_ip) ", 0x0\n\t" \
                ".popsection\n\t"

#define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs)                \
                RSEQ_INJECT_ASM(1)                                      \
                "adr r0, " __rseq_str(cs_label) "\n\t"                  \
                "str r0, %[" __rseq_str(rseq_cs) "]\n\t"                \
                __rseq_str(label) ":\n\t"

#define RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, label)              \
                RSEQ_INJECT_ASM(2)                                      \
                "ldr r0, %[" __rseq_str(current_cpu_id) "]\n\t" \
                "cmp %[" __rseq_str(cpu_id) "], r0\n\t"         \
                "bne " __rseq_str(label) "\n\t"

#define __RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown,           \
                                abort_label, version, flags,            \
                                start_ip, post_commit_offset, abort_ip) \
                ".balign 32\n\t"                                        \
                __rseq_str(table_label) ":\n\t"                         \
                ".word " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
                ".word " __rseq_str(start_ip) ", 0x0, " __rseq_str(post_commit_offset) ", 0x0, " __rseq_str(abort_ip) ", 0x0\n\t" \
                ".word " __rseq_str(RSEQ_SIG) "\n\t"                    \
                __rseq_str(label) ":\n\t"                               \
                teardown                                                \
                "b %l[" __rseq_str(abort_label) "]\n\t"

#define RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown, abort_label, \
                              start_ip, post_commit_ip, abort_ip)       \
        __RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown,           \
                                abort_label, 0x0, 0x0, start_ip,        \
                                (post_commit_ip - start_ip), abort_ip)

#define RSEQ_ASM_DEFINE_CMPFAIL(label, teardown, cmpfail_label)         \
                __rseq_str(label) ":\n\t"                               \
                teardown                                                \
                "b %l[" __rseq_str(cmpfail_label) "]\n\t"

/* Per-cpu-id indexing. */

#define RSEQ_TEMPLATE_CPU_ID
#define RSEQ_TEMPLATE_MO_RELAXED
#include "rseq-arm-bits.h"
#undef RSEQ_TEMPLATE_MO_RELAXED

#define RSEQ_TEMPLATE_MO_RELEASE
#include "rseq-arm-bits.h"
#undef RSEQ_TEMPLATE_MO_RELEASE
#undef RSEQ_TEMPLATE_CPU_ID

/* Per-mm-cid indexing. */

#define RSEQ_TEMPLATE_MM_CID
#define RSEQ_TEMPLATE_MO_RELAXED
#include "rseq-arm-bits.h"
#undef RSEQ_TEMPLATE_MO_RELAXED

#define RSEQ_TEMPLATE_MO_RELEASE
#include "rseq-arm-bits.h"
#undef RSEQ_TEMPLATE_MO_RELEASE
#undef RSEQ_TEMPLATE_MM_CID

/* APIs which are not based on cpu ids. */

#define RSEQ_TEMPLATE_CPU_ID_NONE
#define RSEQ_TEMPLATE_MO_RELAXED
#include "rseq-arm-bits.h"
#undef RSEQ_TEMPLATE_MO_RELAXED
#undef RSEQ_TEMPLATE_CPU_ID_NONE