239 lines
8.9 KiB
C
239 lines
8.9 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
|
|
/*
|
|
* rseq-ppc.h
|
|
*
|
|
* (C) Copyright 2016-2022 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
|
|
* (C) Copyright 2016-2018 - Boqun Feng <boqun.feng@gmail.com>
|
|
*/
|
|
|
|
/*
|
|
* RSEQ_SIG is used with the following trap instruction:
|
|
*
|
|
* powerpc-be: 0f e5 00 0b twui r5,11
|
|
* powerpc64-le: 0b 00 e5 0f twui r5,11
|
|
* powerpc64-be: 0f e5 00 0b twui r5,11
|
|
*/
|
|
|
|
#define RSEQ_SIG 0x0fe5000b
|
|
|
|
#define rseq_smp_mb() __asm__ __volatile__ ("sync" ::: "memory", "cc")
|
|
#define rseq_smp_lwsync() __asm__ __volatile__ ("lwsync" ::: "memory", "cc")
|
|
#define rseq_smp_rmb() rseq_smp_lwsync()
|
|
#define rseq_smp_wmb() rseq_smp_lwsync()
|
|
|
|
#define rseq_smp_load_acquire(p) \
|
|
__extension__ ({ \
|
|
rseq_unqual_scalar_typeof(*(p)) ____p1 = RSEQ_READ_ONCE(*(p)); \
|
|
rseq_smp_lwsync(); \
|
|
____p1; \
|
|
})
|
|
|
|
#define rseq_smp_acquire__after_ctrl_dep() rseq_smp_lwsync()
|
|
|
|
#define rseq_smp_store_release(p, v) \
|
|
do { \
|
|
rseq_smp_lwsync(); \
|
|
RSEQ_WRITE_ONCE(*(p), v); \
|
|
} while (0)
|
|
|
|
/*
|
|
* The __rseq_cs_ptr_array and __rseq_cs sections can be used by debuggers to
|
|
* better handle single-stepping through the restartable critical sections.
|
|
*/
|
|
|
|
#ifdef __PPC64__
|
|
|
|
#define RSEQ_STORE_LONG(arg) "std%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* To memory ("m" constraint) */
|
|
#define RSEQ_STORE_INT(arg) "stw%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* To memory ("m" constraint) */
|
|
#define RSEQ_LOAD_LONG(arg) "ld%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* From memory ("m" constraint) */
|
|
#define RSEQ_LOAD_INT(arg) "lwz%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* From memory ("m" constraint) */
|
|
#define RSEQ_LOADX_LONG "ldx " /* From base register ("b" constraint) */
|
|
#define RSEQ_CMP_LONG "cmpd "
|
|
#define RSEQ_CMP_LONG_INT "cmpdi "
|
|
|
|
#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"
|
|
|
|
#define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \
|
|
RSEQ_INJECT_ASM(1) \
|
|
"lis %%r17, (" __rseq_str(cs_label) ")@highest\n\t" \
|
|
"ori %%r17, %%r17, (" __rseq_str(cs_label) ")@higher\n\t" \
|
|
"rldicr %%r17, %%r17, 32, 31\n\t" \
|
|
"oris %%r17, %%r17, (" __rseq_str(cs_label) ")@high\n\t" \
|
|
"ori %%r17, %%r17, (" __rseq_str(cs_label) ")@l\n\t" \
|
|
"std %%r17, %[" __rseq_str(rseq_cs) "]\n\t" \
|
|
__rseq_str(label) ":\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"
|
|
|
|
#else /* #ifdef __PPC64__ */
|
|
|
|
#define RSEQ_STORE_LONG(arg) "stw%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* To memory ("m" constraint) */
|
|
#define RSEQ_STORE_INT(arg) RSEQ_STORE_LONG(arg) /* To memory ("m" constraint) */
|
|
#define RSEQ_LOAD_LONG(arg) "lwz%U[" __rseq_str(arg) "]%X[" __rseq_str(arg) "] " /* From memory ("m" constraint) */
|
|
#define RSEQ_LOAD_INT(arg) RSEQ_LOAD_LONG(arg) /* From memory ("m" constraint) */
|
|
#define RSEQ_LOADX_LONG "lwzx " /* From base register ("b" constraint) */
|
|
#define RSEQ_CMP_LONG "cmpw "
|
|
#define RSEQ_CMP_LONG_INT "cmpwi "
|
|
|
|
#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" \
|
|
/* 32-bit only supported on BE */ \
|
|
".long 0x0, " __rseq_str(start_ip) ", 0x0, " __rseq_str(post_commit_offset) ", 0x0, " __rseq_str(abort_ip) "\n\t" \
|
|
".popsection\n\t" \
|
|
".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
|
|
".long 0x0, " __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" \
|
|
/* 32-bit only supported on BE */ \
|
|
".long 0x0, " __rseq_str(start_ip) ", 0x0, " __rseq_str(exit_ip) "\n\t" \
|
|
".popsection\n\t"
|
|
|
|
#define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \
|
|
RSEQ_INJECT_ASM(1) \
|
|
"lis %%r17, (" __rseq_str(cs_label) ")@ha\n\t" \
|
|
"addi %%r17, %%r17, (" __rseq_str(cs_label) ")@l\n\t" \
|
|
RSEQ_STORE_INT(rseq_cs) "%%r17, %[" __rseq_str(rseq_cs) "]\n\t" \
|
|
__rseq_str(label) ":\n\t"
|
|
|
|
#endif /* #ifdef __PPC64__ */
|
|
|
|
#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_CMP_CPU_ID(cpu_id, current_cpu_id, label) \
|
|
RSEQ_INJECT_ASM(2) \
|
|
RSEQ_LOAD_INT(current_cpu_id) "%%r17, %[" __rseq_str(current_cpu_id) "]\n\t" \
|
|
"cmpw cr7, %[" __rseq_str(cpu_id) "], %%r17\n\t" \
|
|
"bne- cr7, " __rseq_str(label) "\n\t"
|
|
|
|
#define RSEQ_ASM_DEFINE_ABORT(label, abort_label) \
|
|
".pushsection __rseq_failure, \"ax\"\n\t" \
|
|
".long " __rseq_str(RSEQ_SIG) "\n\t" \
|
|
__rseq_str(label) ":\n\t" \
|
|
"b %l[" __rseq_str(abort_label) "]\n\t" \
|
|
".popsection\n\t"
|
|
|
|
/*
|
|
* RSEQ_ASM_OPs: asm operations for rseq
|
|
* RSEQ_ASM_OP_R_*: has hard-code registers in it
|
|
* RSEQ_ASM_OP_* (else): doesn't have hard-code registers(unless cr7)
|
|
*/
|
|
#define RSEQ_ASM_OP_CMPEQ(var, expect, label) \
|
|
RSEQ_LOAD_LONG(var) "%%r17, %[" __rseq_str(var) "]\n\t" \
|
|
RSEQ_CMP_LONG "cr7, %%r17, %[" __rseq_str(expect) "]\n\t" \
|
|
"bne- cr7, " __rseq_str(label) "\n\t"
|
|
|
|
#define RSEQ_ASM_OP_CMPNE(var, expectnot, label) \
|
|
RSEQ_LOAD_LONG(var) "%%r17, %[" __rseq_str(var) "]\n\t" \
|
|
RSEQ_CMP_LONG "cr7, %%r17, %[" __rseq_str(expectnot) "]\n\t" \
|
|
"beq- cr7, " __rseq_str(label) "\n\t"
|
|
|
|
#define RSEQ_ASM_OP_STORE(value, var) \
|
|
RSEQ_STORE_LONG(var) "%[" __rseq_str(value) "], %[" __rseq_str(var) "]\n\t"
|
|
|
|
/* Load @var to r17 */
|
|
#define RSEQ_ASM_OP_R_LOAD(var) \
|
|
RSEQ_LOAD_LONG(var) "%%r17, %[" __rseq_str(var) "]\n\t"
|
|
|
|
/* Store r17 to @var */
|
|
#define RSEQ_ASM_OP_R_STORE(var) \
|
|
RSEQ_STORE_LONG(var) "%%r17, %[" __rseq_str(var) "]\n\t"
|
|
|
|
/* Add @count to r17 */
|
|
#define RSEQ_ASM_OP_R_ADD(count) \
|
|
"add %%r17, %[" __rseq_str(count) "], %%r17\n\t"
|
|
|
|
/* Load (r17 + voffp) to r17 */
|
|
#define RSEQ_ASM_OP_R_LOADX(voffp) \
|
|
RSEQ_LOADX_LONG "%%r17, %[" __rseq_str(voffp) "], %%r17\n\t"
|
|
|
|
/* TODO: implement a faster memcpy. */
|
|
#define RSEQ_ASM_OP_R_MEMCPY() \
|
|
RSEQ_CMP_LONG_INT "%%r19, 0\n\t" \
|
|
"beq 333f\n\t" \
|
|
"addi %%r20, %%r20, -1\n\t" \
|
|
"addi %%r21, %%r21, -1\n\t" \
|
|
"222:\n\t" \
|
|
"lbzu %%r18, 1(%%r20)\n\t" \
|
|
"stbu %%r18, 1(%%r21)\n\t" \
|
|
"addi %%r19, %%r19, -1\n\t" \
|
|
RSEQ_CMP_LONG_INT "%%r19, 0\n\t" \
|
|
"bne 222b\n\t" \
|
|
"333:\n\t" \
|
|
|
|
#define RSEQ_ASM_OP_R_FINAL_STORE(var, post_commit_label) \
|
|
RSEQ_STORE_LONG(var) "%%r17, %[" __rseq_str(var) "]\n\t" \
|
|
__rseq_str(post_commit_label) ":\n\t"
|
|
|
|
#define RSEQ_ASM_OP_FINAL_STORE(value, var, post_commit_label) \
|
|
RSEQ_STORE_LONG(var) "%[" __rseq_str(value) "], %[" __rseq_str(var) "]\n\t" \
|
|
__rseq_str(post_commit_label) ":\n\t"
|
|
|
|
/* Per-cpu-id indexing. */
|
|
|
|
#define RSEQ_TEMPLATE_CPU_ID
|
|
#define RSEQ_TEMPLATE_MO_RELAXED
|
|
#include "rseq-ppc-bits.h"
|
|
#undef RSEQ_TEMPLATE_MO_RELAXED
|
|
|
|
#define RSEQ_TEMPLATE_MO_RELEASE
|
|
#include "rseq-ppc-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-ppc-bits.h"
|
|
#undef RSEQ_TEMPLATE_MO_RELAXED
|
|
|
|
#define RSEQ_TEMPLATE_MO_RELEASE
|
|
#include "rseq-ppc-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-ppc-bits.h"
|
|
#undef RSEQ_TEMPLATE_MO_RELAXED
|
|
#undef RSEQ_TEMPLATE_CPU_ID_NONE
|