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- /* SPDX-License-Identifier: LGPL-2.1 OR MIT */
- /*
- * RSEQ_SIG uses the trap4 instruction. As Linux does not make use of the
- * access-register mode nor the linkage stack this instruction will always
- * cause a special-operation exception (the trap-enabled bit in the DUCT
- * is and will stay 0). The instruction pattern is
- * b2 ff 0f ff trap4 4095(%r0)
- */
- #define RSEQ_SIG 0xB2FF0FFF
- #define rseq_smp_mb() __asm__ __volatile__ ("bcr 15,0" ::: "memory")
- #define rseq_smp_rmb() rseq_smp_mb()
- #define rseq_smp_wmb() rseq_smp_mb()
- #define rseq_smp_load_acquire(p) \
- __extension__ ({ \
- rseq_unqual_scalar_typeof(*(p)) ____p1 = RSEQ_READ_ONCE(*(p)); \
- rseq_barrier(); \
- ____p1; \
- })
- #define rseq_smp_acquire__after_ctrl_dep() rseq_smp_rmb()
- #define rseq_smp_store_release(p, v) \
- do { \
- rseq_barrier(); \
- RSEQ_WRITE_ONCE(*(p), v); \
- } while (0)
- #define LONG_L "lg"
- #define LONG_S "stg"
- #define LONG_LT_R "ltgr"
- #define LONG_CMP "cg"
- #define LONG_CMP_R "cgr"
- #define LONG_ADDI "aghi"
- #define LONG_ADD_R "agr"
- #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" \
- ".long " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
- ".quad " __rseq_str(start_ip) ", " __rseq_str(post_commit_offset) ", " __rseq_str(abort_ip) "\n\t" \
- ".popsection\n\t" \
- ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
- ".quad " __rseq_str(label) "b\n\t" \
- ".popsection\n\t"
- /*
- * 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" \
- ".quad " __rseq_str(start_ip) ", " __rseq_str(exit_ip) "\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)
- #define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \
- RSEQ_INJECT_ASM(1) \
- "larl %%r0, " __rseq_str(cs_label) "\n\t" \
- LONG_S " %%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) \
- "c %[" __rseq_str(cpu_id) "], %[" __rseq_str(current_cpu_id) "]\n\t" \
- "jnz " __rseq_str(label) "\n\t"
- #define RSEQ_ASM_DEFINE_ABORT(label, teardown, abort_label) \
- ".pushsection __rseq_failure, \"ax\"\n\t" \
- ".long " __rseq_str(RSEQ_SIG) "\n\t" \
- __rseq_str(label) ":\n\t" \
- teardown \
- "jg %l[" __rseq_str(abort_label) "]\n\t" \
- ".popsection\n\t"
- #define RSEQ_ASM_DEFINE_CMPFAIL(label, teardown, cmpfail_label) \
- ".pushsection __rseq_failure, \"ax\"\n\t" \
- __rseq_str(label) ":\n\t" \
- teardown \
- "jg %l[" __rseq_str(cmpfail_label) "]\n\t" \
- ".popsection\n\t"
- /* Per-cpu-id indexing. */
- #define RSEQ_TEMPLATE_CPU_ID
- #define RSEQ_TEMPLATE_MO_RELAXED
- #include "rseq-s390-bits.h"
- #undef RSEQ_TEMPLATE_MO_RELAXED
- #define RSEQ_TEMPLATE_MO_RELEASE
- #include "rseq-s390-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-s390-bits.h"
- #undef RSEQ_TEMPLATE_MO_RELAXED
- #define RSEQ_TEMPLATE_MO_RELEASE
- #include "rseq-s390-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-s390-bits.h"
- #undef RSEQ_TEMPLATE_MO_RELAXED
- #undef RSEQ_TEMPLATE_CPU_ID_NONE
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