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linux/tools/testing/selftests/rseq/rseq-ppc.h
Mathieu Desnoyers b53823fb2e selftests/rseq: Fix: work-around asm goto compiler bugs 
gcc and clang each have their own compiler bugs with respect to asm
goto. Implement a work-around for compiler versions known to have those
bugs.

gcc prior to 4.8.2 miscompiles asm goto.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670

gcc prior to 8.1.0 miscompiles asm goto at O1.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103908

clang prior to version 13.0.1 miscompiles asm goto at O2.
https://github.com/llvm/llvm-project/issues/52735

Work around these issues by adding a volatile inline asm with
memory clobber in the fallthrough after the asm goto and at each
label target.  Emit this for all compilers in case other similar
issues are found in the future.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220124171253.22072-14-mathieu.desnoyers@efficios.com
2022-02-02 13:11:37 +01:00

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/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
/*
* rseq-ppc.h
*
* (C) Copyright 2016-2018 - 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__ ({ \
__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)
#ifdef RSEQ_SKIP_FASTPATH
#include "rseq-skip.h"
#else /* !RSEQ_SKIP_FASTPATH */
/*
* 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"
static inline __attribute__((always_inline))
int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu)
{
RSEQ_INJECT_C(9)
__asm__ __volatile__ goto (
RSEQ_ASM_DEFINE_TABLE(3, 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, 3b, rseq_cs)
/* cmp cpuid */
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
RSEQ_INJECT_ASM(3)
/* cmp @v equal to @expect */
RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail])
RSEQ_INJECT_ASM(4)
#ifdef RSEQ_COMPARE_TWICE
/* cmp cpuid */
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
/* cmp @v equal to @expect */
RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2])
#endif
/* final store */
RSEQ_ASM_OP_FINAL_STORE(newv, v, 2)
RSEQ_INJECT_ASM(5)
RSEQ_ASM_DEFINE_ABORT(4, abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
[rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
[v] "m" (*v),
[expect] "r" (expect),
[newv] "r" (newv)
RSEQ_INJECT_INPUT
: "memory", "cc", "r17"
RSEQ_INJECT_CLOBBER
: abort, cmpfail
#ifdef RSEQ_COMPARE_TWICE
, error1, error2
#endif
);
rseq_after_asm_goto();
return 0;
abort:
rseq_after_asm_goto();
RSEQ_INJECT_FAILED
return -1;
cmpfail:
rseq_after_asm_goto();
return 1;
#ifdef RSEQ_COMPARE_TWICE
error1:
rseq_after_asm_goto();
rseq_bug("cpu_id comparison failed");
error2:
rseq_after_asm_goto();
rseq_bug("expected value comparison failed");
#endif
}
static inline __attribute__((always_inline))
int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,
long voffp, intptr_t *load, int cpu)
{
RSEQ_INJECT_C(9)
__asm__ __volatile__ goto (
RSEQ_ASM_DEFINE_TABLE(3, 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, 3b, rseq_cs)
/* cmp cpuid */
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
RSEQ_INJECT_ASM(3)
/* cmp @v not equal to @expectnot */
RSEQ_ASM_OP_CMPNE(v, expectnot, %l[cmpfail])
RSEQ_INJECT_ASM(4)
#ifdef RSEQ_COMPARE_TWICE
/* cmp cpuid */
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
/* cmp @v not equal to @expectnot */
RSEQ_ASM_OP_CMPNE(v, expectnot, %l[error2])
#endif
/* load the value of @v */
RSEQ_ASM_OP_R_LOAD(v)
/* store it in @load */
RSEQ_ASM_OP_R_STORE(load)
/* dereference voffp(v) */
RSEQ_ASM_OP_R_LOADX(voffp)
/* final store the value at voffp(v) */
RSEQ_ASM_OP_R_FINAL_STORE(v, 2)
RSEQ_INJECT_ASM(5)
RSEQ_ASM_DEFINE_ABORT(4, abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
[rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
/* final store input */
[v] "m" (*v),
[expectnot] "r" (expectnot),
[voffp] "b" (voffp),
[load] "m" (*load)
RSEQ_INJECT_INPUT
: "memory", "cc", "r17"
RSEQ_INJECT_CLOBBER
: abort, cmpfail
#ifdef RSEQ_COMPARE_TWICE
, error1, error2
#endif
);
rseq_after_asm_goto();
return 0;
abort:
rseq_after_asm_goto();
RSEQ_INJECT_FAILED
return -1;
cmpfail:
rseq_after_asm_goto();
return 1;
#ifdef RSEQ_COMPARE_TWICE
error1:
rseq_after_asm_goto();
rseq_bug("cpu_id comparison failed");
error2:
rseq_after_asm_goto();
rseq_bug("expected value comparison failed");
#endif
}
static inline __attribute__((always_inline))
int rseq_addv(intptr_t *v, intptr_t count, int cpu)
{
RSEQ_INJECT_C(9)
__asm__ __volatile__ goto (
RSEQ_ASM_DEFINE_TABLE(3, 1f, 2f, 4f) /* start, commit, abort */
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
#endif
/* Start rseq by storing table entry pointer into rseq_cs. */
RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs)
/* cmp cpuid */
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
RSEQ_INJECT_ASM(3)
#ifdef RSEQ_COMPARE_TWICE
/* cmp cpuid */
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
#endif
/* load the value of @v */
RSEQ_ASM_OP_R_LOAD(v)
/* add @count to it */
RSEQ_ASM_OP_R_ADD(count)
/* final store */
RSEQ_ASM_OP_R_FINAL_STORE(v, 2)
RSEQ_INJECT_ASM(4)
RSEQ_ASM_DEFINE_ABORT(4, abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
[rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
/* final store input */
[v] "m" (*v),
[count] "r" (count)
RSEQ_INJECT_INPUT
: "memory", "cc", "r17"
RSEQ_INJECT_CLOBBER
: abort
#ifdef RSEQ_COMPARE_TWICE
, error1
#endif
);
rseq_after_asm_goto();
return 0;
abort:
rseq_after_asm_goto();
RSEQ_INJECT_FAILED
return -1;
#ifdef RSEQ_COMPARE_TWICE
error1:
rseq_after_asm_goto();
rseq_bug("cpu_id comparison failed");
#endif
}
static inline __attribute__((always_inline))
int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect,
intptr_t *v2, intptr_t newv2,
intptr_t newv, int cpu)
{
RSEQ_INJECT_C(9)
__asm__ __volatile__ goto (
RSEQ_ASM_DEFINE_TABLE(3, 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, 3b, rseq_cs)
/* cmp cpuid */
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
RSEQ_INJECT_ASM(3)
/* cmp @v equal to @expect */
RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail])
RSEQ_INJECT_ASM(4)
#ifdef RSEQ_COMPARE_TWICE
/* cmp cpuid */
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
/* cmp @v equal to @expect */
RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2])
#endif
/* try store */
RSEQ_ASM_OP_STORE(newv2, v2)
RSEQ_INJECT_ASM(5)
/* final store */
RSEQ_ASM_OP_FINAL_STORE(newv, v, 2)
RSEQ_INJECT_ASM(6)
RSEQ_ASM_DEFINE_ABORT(4, abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
[rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
/* try store input */
[v2] "m" (*v2),
[newv2] "r" (newv2),
/* final store input */
[v] "m" (*v),
[expect] "r" (expect),
[newv] "r" (newv)
RSEQ_INJECT_INPUT
: "memory", "cc", "r17"
RSEQ_INJECT_CLOBBER
: abort, cmpfail
#ifdef RSEQ_COMPARE_TWICE
, error1, error2
#endif
);
rseq_after_asm_goto();
return 0;
abort:
rseq_after_asm_goto();
RSEQ_INJECT_FAILED
return -1;
cmpfail:
rseq_after_asm_goto();
return 1;
#ifdef RSEQ_COMPARE_TWICE
error1:
rseq_after_asm_goto();
rseq_bug("cpu_id comparison failed");
error2:
rseq_after_asm_goto();
rseq_bug("expected value comparison failed");
#endif
}
static inline __attribute__((always_inline))
int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect,
intptr_t *v2, intptr_t newv2,
intptr_t newv, int cpu)
{
RSEQ_INJECT_C(9)
__asm__ __volatile__ goto (
RSEQ_ASM_DEFINE_TABLE(3, 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, 3b, rseq_cs)
/* cmp cpuid */
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
RSEQ_INJECT_ASM(3)
/* cmp @v equal to @expect */
RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail])
RSEQ_INJECT_ASM(4)
#ifdef RSEQ_COMPARE_TWICE
/* cmp cpuid */
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
/* cmp @v equal to @expect */
RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2])
#endif
/* try store */
RSEQ_ASM_OP_STORE(newv2, v2)
RSEQ_INJECT_ASM(5)
/* for 'release' */
"lwsync\n\t"
/* final store */
RSEQ_ASM_OP_FINAL_STORE(newv, v, 2)
RSEQ_INJECT_ASM(6)
RSEQ_ASM_DEFINE_ABORT(4, abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
[rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
/* try store input */
[v2] "m" (*v2),
[newv2] "r" (newv2),
/* final store input */
[v] "m" (*v),
[expect] "r" (expect),
[newv] "r" (newv)
RSEQ_INJECT_INPUT
: "memory", "cc", "r17"
RSEQ_INJECT_CLOBBER
: abort, cmpfail
#ifdef RSEQ_COMPARE_TWICE
, error1, error2
#endif
);
rseq_after_asm_goto();
return 0;
abort:
rseq_after_asm_goto();
RSEQ_INJECT_FAILED
return -1;
cmpfail:
rseq_after_asm_goto();
return 1;
#ifdef RSEQ_COMPARE_TWICE
error1:
rseq_after_asm_goto();
rseq_bug("cpu_id comparison failed");
error2:
rseq_after_asm_goto();
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)
__asm__ __volatile__ goto (
RSEQ_ASM_DEFINE_TABLE(3, 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, 3b, rseq_cs)
/* cmp cpuid */
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
RSEQ_INJECT_ASM(3)
/* cmp @v equal to @expect */
RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail])
RSEQ_INJECT_ASM(4)
/* cmp @v2 equal to @expct2 */
RSEQ_ASM_OP_CMPEQ(v2, expect2, %l[cmpfail])
RSEQ_INJECT_ASM(5)
#ifdef RSEQ_COMPARE_TWICE
/* cmp cpuid */
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
/* cmp @v equal to @expect */
RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2])
/* cmp @v2 equal to @expct2 */
RSEQ_ASM_OP_CMPEQ(v2, expect2, %l[error3])
#endif
/* final store */
RSEQ_ASM_OP_FINAL_STORE(newv, v, 2)
RSEQ_INJECT_ASM(6)
RSEQ_ASM_DEFINE_ABORT(4, abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
[rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
/* cmp2 input */
[v2] "m" (*v2),
[expect2] "r" (expect2),
/* final store input */
[v] "m" (*v),
[expect] "r" (expect),
[newv] "r" (newv)
RSEQ_INJECT_INPUT
: "memory", "cc", "r17"
RSEQ_INJECT_CLOBBER
: abort, cmpfail
#ifdef RSEQ_COMPARE_TWICE
, error1, error2, error3
#endif
);
rseq_after_asm_goto();
return 0;
abort:
rseq_after_asm_goto();
RSEQ_INJECT_FAILED
return -1;
cmpfail:
rseq_after_asm_goto();
return 1;
#ifdef RSEQ_COMPARE_TWICE
error1:
rseq_after_asm_goto();
rseq_bug("cpu_id comparison failed");
error2:
rseq_after_asm_goto();
rseq_bug("1st expected value comparison failed");
error3:
rseq_after_asm_goto();
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)
{
RSEQ_INJECT_C(9)
__asm__ __volatile__ goto (
RSEQ_ASM_DEFINE_TABLE(3, 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
/* setup for mempcy */
"mr %%r19, %[len]\n\t"
"mr %%r20, %[src]\n\t"
"mr %%r21, %[dst]\n\t"
/* Start rseq by storing table entry pointer into rseq_cs. */
RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs)
/* cmp cpuid */
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
RSEQ_INJECT_ASM(3)
/* cmp @v equal to @expect */
RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail])
RSEQ_INJECT_ASM(4)
#ifdef RSEQ_COMPARE_TWICE
/* cmp cpuid */
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
/* cmp @v equal to @expect */
RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2])
#endif
/* try memcpy */
RSEQ_ASM_OP_R_MEMCPY()
RSEQ_INJECT_ASM(5)
/* final store */
RSEQ_ASM_OP_FINAL_STORE(newv, v, 2)
RSEQ_INJECT_ASM(6)
/* teardown */
RSEQ_ASM_DEFINE_ABORT(4, abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
[rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
/* 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_INJECT_INPUT
: "memory", "cc", "r17", "r18", "r19", "r20", "r21"
RSEQ_INJECT_CLOBBER
: abort, cmpfail
#ifdef RSEQ_COMPARE_TWICE
, error1, error2
#endif
);
rseq_after_asm_goto();
return 0;
abort:
rseq_after_asm_goto();
RSEQ_INJECT_FAILED
return -1;
cmpfail:
rseq_after_asm_goto();
return 1;
#ifdef RSEQ_COMPARE_TWICE
error1:
rseq_after_asm_goto();
rseq_bug("cpu_id comparison failed");
error2:
rseq_after_asm_goto();
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)
{
RSEQ_INJECT_C(9)
__asm__ __volatile__ goto (
RSEQ_ASM_DEFINE_TABLE(3, 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
/* setup for mempcy */
"mr %%r19, %[len]\n\t"
"mr %%r20, %[src]\n\t"
"mr %%r21, %[dst]\n\t"
/* Start rseq by storing table entry pointer into rseq_cs. */
RSEQ_ASM_STORE_RSEQ_CS(1, 3b, rseq_cs)
/* cmp cpuid */
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
RSEQ_INJECT_ASM(3)
/* cmp @v equal to @expect */
RSEQ_ASM_OP_CMPEQ(v, expect, %l[cmpfail])
RSEQ_INJECT_ASM(4)
#ifdef RSEQ_COMPARE_TWICE
/* cmp cpuid */
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
/* cmp @v equal to @expect */
RSEQ_ASM_OP_CMPEQ(v, expect, %l[error2])
#endif
/* try memcpy */
RSEQ_ASM_OP_R_MEMCPY()
RSEQ_INJECT_ASM(5)
/* for 'release' */
"lwsync\n\t"
/* final store */
RSEQ_ASM_OP_FINAL_STORE(newv, v, 2)
RSEQ_INJECT_ASM(6)
/* teardown */
RSEQ_ASM_DEFINE_ABORT(4, abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
[rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr),
/* 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_INJECT_INPUT
: "memory", "cc", "r17", "r18", "r19", "r20", "r21"
RSEQ_INJECT_CLOBBER
: abort, cmpfail
#ifdef RSEQ_COMPARE_TWICE
, error1, error2
#endif
);
rseq_after_asm_goto();
return 0;
abort:
rseq_after_asm_goto();
RSEQ_INJECT_FAILED
return -1;
cmpfail:
rseq_after_asm_goto();
return 1;
#ifdef RSEQ_COMPARE_TWICE
error1:
rseq_after_asm_goto();
rseq_bug("cpu_id comparison failed");
error2:
rseq_after_asm_goto();
rseq_bug("expected value comparison failed");
#endif
}
#endif /* !RSEQ_SKIP_FASTPATH */
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