717 lines
19 KiB
C
717 lines
19 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
|
|
/*
|
|
* rseq-arm.h
|
|
*
|
|
* (C) Copyright 2016-2018 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
|
|
*/
|
|
|
|
#define RSEQ_SIG 0x53053053
|
|
|
|
#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__ ({ \
|
|
__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)
|
|
|
|
#ifdef RSEQ_SKIP_FASTPATH
|
|
#include "rseq-skip.h"
|
|
#else /* !RSEQ_SKIP_FASTPATH */
|
|
|
|
#define __RSEQ_ASM_DEFINE_TABLE(version, flags, start_ip, \
|
|
post_commit_offset, abort_ip) \
|
|
".pushsection __rseq_table, \"aw\"\n\t" \
|
|
".balign 32\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"
|
|
|
|
#define RSEQ_ASM_DEFINE_TABLE(start_ip, post_commit_ip, abort_ip) \
|
|
__RSEQ_ASM_DEFINE_TABLE(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) \
|
|
"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"
|
|
|
|
#define rseq_workaround_gcc_asm_size_guess() __asm__ __volatile__("")
|
|
|
|
static inline __attribute__((always_inline))
|
|
int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu)
|
|
{
|
|
RSEQ_INJECT_C(9)
|
|
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
__asm__ __volatile__ goto (
|
|
RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
|
|
/* 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
|
|
/* final store */
|
|
"str %[newv], %[v]\n\t"
|
|
"2:\n\t"
|
|
RSEQ_INJECT_ASM(5)
|
|
"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),
|
|
[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_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,
|
|
off_t voffp, intptr_t *load, int cpu)
|
|
{
|
|
RSEQ_INJECT_C(9)
|
|
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
__asm__ __volatile__ goto (
|
|
RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
|
|
/* 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 %[expectnot], r0\n\t"
|
|
"beq %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 %[expectnot], r0\n\t"
|
|
"beq %l[error2]\n\t"
|
|
#endif
|
|
"str r0, %[load]\n\t"
|
|
"add r0, %[voffp]\n\t"
|
|
"ldr r0, [r0]\n\t"
|
|
/* final store */
|
|
"str r0, %[v]\n\t"
|
|
"2:\n\t"
|
|
RSEQ_INJECT_ASM(5)
|
|
"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),
|
|
/* final store input */
|
|
[v] "m" (*v),
|
|
[expectnot] "r" (expectnot),
|
|
[voffp] "Ir" (voffp),
|
|
[load] "m" (*load)
|
|
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_addv(intptr_t *v, intptr_t count, int cpu)
|
|
{
|
|
RSEQ_INJECT_C(9)
|
|
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
__asm__ __volatile__ goto (
|
|
RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
|
|
/* 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)
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1])
|
|
#endif
|
|
"ldr r0, %[v]\n\t"
|
|
"add r0, %[count]\n\t"
|
|
/* final store */
|
|
"str r0, %[v]\n\t"
|
|
"2:\n\t"
|
|
RSEQ_INJECT_ASM(4)
|
|
"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),
|
|
[v] "m" (*v),
|
|
[count] "Ir" (count)
|
|
RSEQ_INJECT_INPUT
|
|
: "r0", "memory", "cc"
|
|
RSEQ_INJECT_CLOBBER
|
|
: abort
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
, error1
|
|
#endif
|
|
);
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
return 0;
|
|
abort:
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
RSEQ_INJECT_FAILED
|
|
return -1;
|
|
#ifdef RSEQ_COMPARE_TWICE
|
|
error1:
|
|
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)
|
|
|
|
rseq_workaround_gcc_asm_size_guess();
|
|
__asm__ __volatile__ goto (
|
|
RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
|
|
/* 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)
|
|
/* 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_trystorev_storev_release(intptr_t *v, intptr_t expect,
|
|
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(1f, 2f, 4f) /* start, commit, abort */
|
|
/* 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(1f, 2f, 4f) /* start, commit, abort */
|
|
/* 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(1f, 2f, 4f) /* start, commit, abort */
|
|
"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(1f, 2f, 4f) /* start, commit, abort */
|
|
"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 */
|