* [PATCH v4 0/2] RISC-V: add support for restartable sequence
@ 2022-03-08 8:32 Vincent Chen
2022-03-08 8:32 ` [PATCH v4 1/2] RISC-V: Add " Vincent Chen
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: Vincent Chen @ 2022-03-08 8:32 UTC (permalink / raw)
To: palmer, mathieu.desnoyers; +Cc: linux-riscv, paul.walmsley, vincent.chen
Add RSEQ, restartable sequence, support and related selftest to RISCV.
The relevant RSEQ tests in kselftest require the binutils patch "RISC-V:
Fix linker problems with TLS copy relocs" to avoid placing
PREINIT_ARRAY and TLS variable of librseq.so at the same address.
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=3e7bd7f24146f162565edf878840449f36a8d974
A segmental fault will happen if binutils misses this patch.
Changes since v3:
1. Modify the endianness checking.
2. Fix a bug encountered in 32bit environment.
Changes since v2:
1. Move rseq_signal_deliver() after syscall restart handling.
2. Add rseq_offset_deref_addv() to support memory barrier tests.
Vincent Chen (2):
RISC-V: Add support for restartable sequence
rseq/selftests: Add support for RISC-V
arch/riscv/Kconfig | 1 +
arch/riscv/kernel/entry.S | 4 +
arch/riscv/kernel/signal.c | 2 +
tools/testing/selftests/rseq/param_test.c | 23 +
tools/testing/selftests/rseq/rseq-riscv.h | 677 ++++++++++++++++++++++
tools/testing/selftests/rseq/rseq.h | 2 +
6 files changed, 709 insertions(+)
create mode 100644 tools/testing/selftests/rseq/rseq-riscv.h
--
2.17.1
_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v4 1/2] RISC-V: Add support for restartable sequence
2022-03-08 8:32 [PATCH v4 0/2] RISC-V: add support for restartable sequence Vincent Chen
@ 2022-03-08 8:32 ` Vincent Chen
2022-03-08 8:32 ` [PATCH v4 2/2] rseq/selftests: Add support for RISC-V Vincent Chen
2022-03-23 0:54 ` [PATCH v4 0/2] RISC-V: add support for restartable sequence Palmer Dabbelt
2 siblings, 0 replies; 5+ messages in thread
From: Vincent Chen @ 2022-03-08 8:32 UTC (permalink / raw)
To: palmer, mathieu.desnoyers; +Cc: linux-riscv, paul.walmsley, vincent.chen
Add calls to rseq_signal_deliver() and rseq_syscall() to introduce RSEQ
support.
1. Call the rseq_signal_deliver() function to fixup on the pre-signal
frame when a signal is delivered on top of a restartable sequence
critical section.
2. Check that system calls are not invoked from within rseq critical
sections by invoking rseq_signal() from ret_from_syscall(). With
CONFIG_DEBUG_RSEQ, such behavior results in termination of the
process with SIGSEGV.
Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---
arch/riscv/Kconfig | 1 +
arch/riscv/kernel/entry.S | 4 ++++
arch/riscv/kernel/signal.c | 2 ++
3 files changed, 7 insertions(+)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 5adcbd9b5e88..67a671b099b6 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -101,6 +101,7 @@ config RISCV
select HAVE_FUNCTION_ARG_ACCESS_API
select HAVE_STACKPROTECTOR
select HAVE_SYSCALL_TRACEPOINTS
+ select HAVE_RSEQ
select IRQ_DOMAIN
select IRQ_FORCED_THREADING
select MODULES_USE_ELF_RELA if MODULES
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index ed29e9c8f660..56ada2a583fa 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -225,6 +225,10 @@ ret_from_syscall:
* (If it was configured with SECCOMP_RET_ERRNO/TRACE)
*/
ret_from_syscall_rejected:
+#ifdef CONFIG_DEBUG_RSEQ
+ move a0, sp
+ call rseq_syscall
+#endif
/* Trace syscalls, but only if requested by the user. */
REG_L t0, TASK_TI_FLAGS(tp)
andi t0, t0, _TIF_SYSCALL_WORK
diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c
index c2d5ecbe5526..16da3c3b53a1 100644
--- a/arch/riscv/kernel/signal.c
+++ b/arch/riscv/kernel/signal.c
@@ -258,6 +258,8 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
}
}
+ rseq_signal_deliver(ksig, regs);
+
/* Set up the stack frame */
ret = setup_rt_frame(ksig, oldset, regs);
--
2.17.1
_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v4 2/2] rseq/selftests: Add support for RISC-V
2022-03-08 8:32 [PATCH v4 0/2] RISC-V: add support for restartable sequence Vincent Chen
2022-03-08 8:32 ` [PATCH v4 1/2] RISC-V: Add " Vincent Chen
@ 2022-03-08 8:32 ` Vincent Chen
2022-03-08 15:24 ` Mathieu Desnoyers
2022-03-23 0:54 ` [PATCH v4 0/2] RISC-V: add support for restartable sequence Palmer Dabbelt
2 siblings, 1 reply; 5+ messages in thread
From: Vincent Chen @ 2022-03-08 8:32 UTC (permalink / raw)
To: palmer, mathieu.desnoyers; +Cc: linux-riscv, paul.walmsley, vincent.chen
Add support for RISC-V in the rseq selftests, which covers both
64-bit and 32-bit ISA with little endian mode.
Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Tested-by: Eric Lin <eric.lin@sifive.com>
---
tools/testing/selftests/rseq/param_test.c | 23 +
tools/testing/selftests/rseq/rseq-riscv.h | 677 ++++++++++++++++++++++
tools/testing/selftests/rseq/rseq.h | 2 +
3 files changed, 702 insertions(+)
create mode 100644 tools/testing/selftests/rseq/rseq-riscv.h
diff --git a/tools/testing/selftests/rseq/param_test.c b/tools/testing/selftests/rseq/param_test.c
index 699ad5f93c34..0a6b8eafd444 100644
--- a/tools/testing/selftests/rseq/param_test.c
+++ b/tools/testing/selftests/rseq/param_test.c
@@ -207,6 +207,29 @@ unsigned int yield_mod_cnt, nr_abort;
"addiu " INJECT_ASM_REG ", -1\n\t" \
"bnez " INJECT_ASM_REG ", 222b\n\t" \
"333:\n\t"
+#elif defined(__riscv)
+
+#define RSEQ_INJECT_INPUT \
+ , [loop_cnt_1]"m"(loop_cnt[1]) \
+ , [loop_cnt_2]"m"(loop_cnt[2]) \
+ , [loop_cnt_3]"m"(loop_cnt[3]) \
+ , [loop_cnt_4]"m"(loop_cnt[4]) \
+ , [loop_cnt_5]"m"(loop_cnt[5]) \
+ , [loop_cnt_6]"m"(loop_cnt[6])
+
+#define INJECT_ASM_REG "t1"
+
+#define RSEQ_INJECT_CLOBBER \
+ , INJECT_ASM_REG
+
+#define RSEQ_INJECT_ASM(n) \
+ "lw " INJECT_ASM_REG ", %[loop_cnt_" #n "]\n\t" \
+ "beqz " INJECT_ASM_REG ", 333f\n\t" \
+ "222:\n\t" \
+ "addi " INJECT_ASM_REG "," INJECT_ASM_REG ", -1\n\t" \
+ "bnez " INJECT_ASM_REG ", 222b\n\t" \
+ "333:\n\t"
+
#else
#error unsupported target
diff --git a/tools/testing/selftests/rseq/rseq-riscv.h b/tools/testing/selftests/rseq/rseq-riscv.h
new file mode 100644
index 000000000000..b86642f90d7f
--- /dev/null
+++ b/tools/testing/selftests/rseq/rseq-riscv.h
@@ -0,0 +1,677 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * Select the instruction "csrw mhartid, x0" as the RSEQ_SIG. Unlike
+ * other architectures, the ebreak instruction has no immediate field for
+ * distinguishing purposes. Hence, ebreak is not suitable as RSEQ_SIG.
+ * "csrw mhartid, x0" can also satisfy the RSEQ requirement because it
+ * is an uncommon instruction and will raise an illegal instruction
+ * exception when executed in all modes.
+ */
+#include <endian.h>
+
+#if defined(__BYTE_ORDER) ? (__BYTE_ORDER == __LITTLE_ENDIAN) : defined(__LITTLE_ENDIAN)
+#define RSEQ_SIG 0xf1401073 /* csrr mhartid, x0 */
+#else
+#error "Currently, RSEQ only supports Little-Endian version"
+#endif
+
+#if __riscv_xlen == 64
+#define __REG_SEL(a, b) a
+#elif __riscv_xlen == 32
+#define __REG_SEL(a, b) b
+#endif
+
+#define REG_L __REG_SEL("ld ", "lw ")
+#define REG_S __REG_SEL("sd ", "sw ")
+
+#define RISCV_FENCE(p, s) \
+ __asm__ __volatile__ ("fence " #p "," #s : : : "memory")
+#define rseq_smp_mb() RISCV_FENCE(rw, rw)
+#define rseq_smp_rmb() RISCV_FENCE(r, r)
+#define rseq_smp_wmb() RISCV_FENCE(w, w)
+#define RSEQ_ASM_TMP_REG_1 "t6"
+#define RSEQ_ASM_TMP_REG_2 "t5"
+#define RSEQ_ASM_TMP_REG_3 "t4"
+#define RSEQ_ASM_TMP_REG_4 "t3"
+
+#define rseq_smp_load_acquire(p) \
+__extension__ ({ \
+ __typeof(*(p)) ____p1 = RSEQ_READ_ONCE(*(p)); \
+ RISCV_FENCE(r, rw) \
+ ____p1; \
+})
+
+#define rseq_smp_acquire__after_ctrl_dep() rseq_smp_rmb()
+
+#define rseq_smp_store_release(p, v) \
+do { \
+ RISCV_FENCE(rw, w); \
+ RSEQ_WRITE_ONCE(*(p), v); \
+} while (0)
+
+#ifdef RSEQ_SKIP_FASTPATH
+#include "rseq-skip.h"
+#else /* !RSEQ_SKIP_FASTPATH */
+
+#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, start_ip, \
+ post_commit_offset, abort_ip) \
+ ".pushsection __rseq_cs, \"aw\"\n" \
+ ".balign 32\n" \
+ __rseq_str(label) ":\n" \
+ ".long " __rseq_str(version) ", " __rseq_str(flags) "\n" \
+ ".quad " __rseq_str(start_ip) ", " \
+ __rseq_str(post_commit_offset) ", " \
+ __rseq_str(abort_ip) "\n" \
+ ".popsection\n\t" \
+ ".pushsection __rseq_cs_ptr_array, \"aw\"\n" \
+ ".quad " __rseq_str(label) "b\n" \
+ ".popsection\n"
+
+#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" \
+ ".quad " __rseq_str(start_ip) ", " __rseq_str(exit_ip) "\n" \
+ ".popsection\n"
+
+#define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \
+ RSEQ_INJECT_ASM(1) \
+ "la "RSEQ_ASM_TMP_REG_1 ", " __rseq_str(cs_label) "\n" \
+ REG_S RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(rseq_cs) "]\n" \
+ __rseq_str(label) ":\n"
+
+#define RSEQ_ASM_DEFINE_ABORT(label, abort_label) \
+ "j 222f\n" \
+ ".balign 4\n" \
+ ".long " __rseq_str(RSEQ_SIG) "\n" \
+ __rseq_str(label) ":\n" \
+ "j %l[" __rseq_str(abort_label) "]\n" \
+ "222:\n"
+
+#define RSEQ_ASM_OP_STORE(value, var) \
+ REG_S "%[" __rseq_str(value) "], %[" __rseq_str(var) "]\n"
+
+#define RSEQ_ASM_OP_CMPEQ(var, expect, label) \
+ REG_L RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(var) "]\n" \
+ "bne "RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(expect) "] ," \
+ __rseq_str(label) "\n"
+
+#define RSEQ_ASM_OP_CMPEQ32(var, expect, label) \
+ "lw "RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(var) "]\n" \
+ "bne "RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(expect) "] ," \
+ __rseq_str(label) "\n"
+
+#define RSEQ_ASM_OP_CMPNE(var, expect, label) \
+ REG_L RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(var) "]\n" \
+ "beq "RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(expect) "] ," \
+ __rseq_str(label) "\n"
+
+#define RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, label) \
+ RSEQ_INJECT_ASM(2) \
+ RSEQ_ASM_OP_CMPEQ32(current_cpu_id, cpu_id, label)
+
+#define RSEQ_ASM_OP_R_LOAD(var) \
+ REG_L RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(var) "]\n"
+
+#define RSEQ_ASM_OP_R_STORE(var) \
+ REG_S RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(var) "]\n"
+
+#define RSEQ_ASM_OP_R_LOAD_OFF(offset) \
+ "add "RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(offset) "], " \
+ RSEQ_ASM_TMP_REG_1 "\n" \
+ REG_L RSEQ_ASM_TMP_REG_1 ", (" RSEQ_ASM_TMP_REG_1 ")\n"
+
+#define RSEQ_ASM_OP_R_ADD(count) \
+ "add "RSEQ_ASM_TMP_REG_1 ", " RSEQ_ASM_TMP_REG_1 \
+ ", %[" __rseq_str(count) "]\n"
+
+#define RSEQ_ASM_OP_FINAL_STORE(value, var, post_commit_label) \
+ RSEQ_ASM_OP_STORE(value, var) \
+ __rseq_str(post_commit_label) ":\n"
+
+#define RSEQ_ASM_OP_FINAL_STORE_RELEASE(value, var, post_commit_label) \
+ "fence rw, w\n" \
+ RSEQ_ASM_OP_STORE(value, var) \
+ __rseq_str(post_commit_label) ":\n"
+
+#define RSEQ_ASM_OP_R_FINAL_STORE(var, post_commit_label) \
+ REG_S RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(var) "]\n" \
+ __rseq_str(post_commit_label) ":\n"
+
+#define RSEQ_ASM_OP_R_BAD_MEMCPY(dst, src, len) \
+ "beqz %[" __rseq_str(len) "], 333f\n" \
+ "mv " RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(len) "]\n" \
+ "mv " RSEQ_ASM_TMP_REG_2 ", %[" __rseq_str(src) "]\n" \
+ "mv " RSEQ_ASM_TMP_REG_3 ", %[" __rseq_str(dst) "]\n" \
+ "222:\n" \
+ "lb " RSEQ_ASM_TMP_REG_4 ", 0(" RSEQ_ASM_TMP_REG_2 ")\n" \
+ "sb " RSEQ_ASM_TMP_REG_4 ", 0(" RSEQ_ASM_TMP_REG_3 ")\n" \
+ "addi " RSEQ_ASM_TMP_REG_1 ", " RSEQ_ASM_TMP_REG_1 ", -1\n" \
+ "addi " RSEQ_ASM_TMP_REG_2 ", " RSEQ_ASM_TMP_REG_2 ", 1\n" \
+ "addi " RSEQ_ASM_TMP_REG_3 ", " RSEQ_ASM_TMP_REG_3 ", 1\n" \
+ "bnez " RSEQ_ASM_TMP_REG_1 ", 222b\n" \
+ "333:\n"
+
+#define RSEQ_ASM_OP_R_DEREF_ADDV(ptr, off, post_commit_label) \
+ "mv " RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(ptr) "]\n" \
+ RSEQ_ASM_OP_R_ADD(off) \
+ REG_L RSEQ_ASM_TMP_REG_1 ", 0(" RSEQ_ASM_TMP_REG_1 ")\n" \
+ RSEQ_ASM_OP_R_ADD(inc) \
+ __rseq_str(post_commit_label) ":\n"
+
+static inline __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(1, 2f, 3f, 4f)
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[cmpfail]")
+#ifdef RSEQ_COMPARE_TWICE
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error2]")
+#endif
+ RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
+ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
+ RSEQ_INJECT_ASM(3)
+ RSEQ_ASM_OP_CMPEQ(v, expect, "%l[cmpfail]")
+ RSEQ_INJECT_ASM(4)
+#ifdef RSEQ_COMPARE_TWICE
+ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, "%l[error1]")
+ RSEQ_ASM_OP_CMPEQ(v, expect, "%l[error2]")
+#endif
+ RSEQ_ASM_OP_FINAL_STORE(newv, v, 3)
+ 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_abi.cpu_id),
+ [rseq_cs] "m" (__rseq_abi.rseq_cs),
+ [v] "m" (*v),
+ [expect] "r" (expect),
+ [newv] "r" (newv)
+ RSEQ_INJECT_INPUT
+ : "memory", RSEQ_ASM_TMP_REG_1
+ RSEQ_INJECT_CLOBBER
+ : abort, cmpfail
+#ifdef RSEQ_COMPARE_TWICE
+ , error1, error2
+#endif
+ );
+
+ return 0;
+abort:
+ RSEQ_INJECT_FAILED
+ return -1;
+cmpfail:
+ return 1;
+#ifdef RSEQ_COMPARE_TWICE
+error1:
+ rseq_bug("cpu_id comparison failed");
+error2:
+ rseq_bug("expected value comparison failed");
+#endif
+}
+
+static inline __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)
+
+ __asm__ __volatile__ goto(RSEQ_ASM_DEFINE_TABLE(1, 2f, 3f, 4f)
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[cmpfail]")
+#ifdef RSEQ_COMPARE_TWICE
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error2]")
+#endif
+ RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
+ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
+ RSEQ_INJECT_ASM(3)
+ RSEQ_ASM_OP_CMPNE(v, expectnot, "%l[cmpfail]")
+ RSEQ_INJECT_ASM(4)
+#ifdef RSEQ_COMPARE_TWICE
+ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, "%l[error1]")
+ RSEQ_ASM_OP_CMPNE(v, expectnot, "%l[error2]")
+#endif
+ RSEQ_ASM_OP_R_LOAD(v)
+ RSEQ_ASM_OP_R_STORE(load)
+ RSEQ_ASM_OP_R_LOAD_OFF(voffp)
+ RSEQ_ASM_OP_R_FINAL_STORE(v, 3)
+ 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_abi.cpu_id),
+ [rseq_cs] "m" (__rseq_abi.rseq_cs),
+ [v] "m" (*v),
+ [expectnot] "r" (expectnot),
+ [load] "m" (*load),
+ [voffp] "r" (voffp)
+ RSEQ_INJECT_INPUT
+ : "memory", RSEQ_ASM_TMP_REG_1
+ RSEQ_INJECT_CLOBBER
+ : abort, cmpfail
+#ifdef RSEQ_COMPARE_TWICE
+ , error1, error2
+#endif
+ );
+ return 0;
+abort:
+ RSEQ_INJECT_FAILED
+ return -1;
+cmpfail:
+ return 1;
+#ifdef RSEQ_COMPARE_TWICE
+error1:
+ rseq_bug("cpu_id comparison failed");
+error2:
+ rseq_bug("expected value comparison failed");
+#endif
+}
+
+static inline __always_inline
+int rseq_addv(intptr_t *v, intptr_t count, int cpu)
+{
+ RSEQ_INJECT_C(9)
+
+ __asm__ __volatile__ goto(RSEQ_ASM_DEFINE_TABLE(1, 2f, 3f, 4f)
+#ifdef RSEQ_COMPARE_TWICE
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
+#endif
+ RSEQ_ASM_STORE_RSEQ_CS(2, 1b, 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
+ RSEQ_ASM_OP_R_LOAD(v)
+ RSEQ_ASM_OP_R_ADD(count)
+ RSEQ_ASM_OP_R_FINAL_STORE(v, 3)
+ 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_abi.cpu_id),
+ [rseq_cs] "m" (__rseq_abi.rseq_cs),
+ [v] "m" (*v),
+ [count] "r" (count)
+ RSEQ_INJECT_INPUT
+ : "memory", RSEQ_ASM_TMP_REG_1
+ RSEQ_INJECT_CLOBBER
+ : abort
+#ifdef RSEQ_COMPARE_TWICE
+ , error1
+#endif
+ );
+ return 0;
+abort:
+ RSEQ_INJECT_FAILED
+ return -1;
+#ifdef RSEQ_COMPARE_TWICE
+error1:
+ rseq_bug("cpu_id comparison failed");
+#endif
+}
+
+static inline __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(1, 2f, 3f, 4f)
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[cmpfail]")
+#ifdef RSEQ_COMPARE_TWICE
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error2]")
+#endif
+ RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
+ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
+ RSEQ_INJECT_ASM(3)
+ RSEQ_ASM_OP_CMPEQ(v, expect, "%l[cmpfail]")
+ RSEQ_INJECT_ASM(4)
+#ifdef RSEQ_COMPARE_TWICE
+ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, "%l[error1]")
+ RSEQ_ASM_OP_CMPEQ(v, expect, "%l[error2]")
+#endif
+ RSEQ_ASM_OP_STORE(newv2, v2)
+ RSEQ_INJECT_ASM(5)
+ RSEQ_ASM_OP_FINAL_STORE(newv, v, 3)
+ 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_abi.cpu_id),
+ [rseq_cs] "m" (__rseq_abi.rseq_cs),
+ [expect] "r" (expect),
+ [v] "m" (*v),
+ [newv] "r" (newv),
+ [v2] "m" (*v2),
+ [newv2] "r" (newv2)
+ RSEQ_INJECT_INPUT
+ : "memory", RSEQ_ASM_TMP_REG_1
+ RSEQ_INJECT_CLOBBER
+ : abort, cmpfail
+#ifdef RSEQ_COMPARE_TWICE
+ , error1, error2
+#endif
+ );
+
+ return 0;
+abort:
+ RSEQ_INJECT_FAILED
+ return -1;
+cmpfail:
+ return 1;
+#ifdef RSEQ_COMPARE_TWICE
+error1:
+ rseq_bug("cpu_id comparison failed");
+error2:
+ rseq_bug("expected value comparison failed");
+#endif
+}
+
+static inline __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(1, 2f, 3f, 4f)
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[cmpfail]")
+#ifdef RSEQ_COMPARE_TWICE
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error2]")
+#endif
+ RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
+ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
+ RSEQ_INJECT_ASM(3)
+ RSEQ_ASM_OP_CMPEQ(v, expect, "%l[cmpfail]")
+ RSEQ_INJECT_ASM(4)
+#ifdef RSEQ_COMPARE_TWICE
+ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, "%l[error1]")
+ RSEQ_ASM_OP_CMPEQ(v, expect, "%l[error2]")
+#endif
+ RSEQ_ASM_OP_STORE(newv2, v2)
+ RSEQ_INJECT_ASM(5)
+ RSEQ_ASM_OP_FINAL_STORE_RELEASE(newv, v, 3)
+ 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_abi.cpu_id),
+ [rseq_cs] "m" (__rseq_abi.rseq_cs),
+ [expect] "r" (expect),
+ [v] "m" (*v),
+ [newv] "r" (newv),
+ [v2] "m" (*v2),
+ [newv2] "r" (newv2)
+ RSEQ_INJECT_INPUT
+ : "memory", RSEQ_ASM_TMP_REG_1
+ RSEQ_INJECT_CLOBBER
+ : abort, cmpfail
+#ifdef RSEQ_COMPARE_TWICE
+ , error1, error2
+#endif
+ );
+
+ return 0;
+abort:
+ RSEQ_INJECT_FAILED
+ return -1;
+cmpfail:
+ return 1;
+#ifdef RSEQ_COMPARE_TWICE
+error1:
+ rseq_bug("cpu_id comparison failed");
+error2:
+ rseq_bug("expected value comparison failed");
+#endif
+}
+
+static inline __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(1, 2f, 3f, 4f)
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[cmpfail]")
+#ifdef RSEQ_COMPARE_TWICE
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error2]")
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error3]")
+#endif
+ RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
+ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
+ RSEQ_INJECT_ASM(3)
+ RSEQ_ASM_OP_CMPEQ(v, expect, "%l[cmpfail]")
+ RSEQ_INJECT_ASM(4)
+ RSEQ_ASM_OP_CMPEQ(v2, expect2, "%l[cmpfail]")
+ RSEQ_INJECT_ASM(5)
+#ifdef RSEQ_COMPARE_TWICE
+ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, "%l[error1]")
+ RSEQ_ASM_OP_CMPEQ(v, expect, "%l[error2]")
+ RSEQ_ASM_OP_CMPEQ(v2, expect2, "%l[error3]")
+#endif
+ RSEQ_ASM_OP_FINAL_STORE(newv, v, 3)
+ 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_abi.cpu_id),
+ [rseq_cs] "m" (__rseq_abi.rseq_cs),
+ [v] "m" (*v),
+ [expect] "r" (expect),
+ [v2] "m" (*v2),
+ [expect2] "r" (expect2),
+ [newv] "r" (newv)
+ RSEQ_INJECT_INPUT
+ : "memory", RSEQ_ASM_TMP_REG_1
+ RSEQ_INJECT_CLOBBER
+ : abort, cmpfail
+#ifdef RSEQ_COMPARE_TWICE
+ , error1, error2, error3
+#endif
+ );
+
+ return 0;
+abort:
+ RSEQ_INJECT_FAILED
+ return -1;
+cmpfail:
+ return 1;
+#ifdef RSEQ_COMPARE_TWICE
+error1:
+ rseq_bug("cpu_id comparison failed");
+error2:
+ rseq_bug("expected value comparison failed");
+error3:
+ rseq_bug("2nd expected value comparison failed");
+#endif
+}
+
+static inline __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(1, 2f, 3f, 4f)
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[cmpfail]")
+#ifdef RSEQ_COMPARE_TWICE
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error2]")
+#endif
+ RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
+ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
+ RSEQ_INJECT_ASM(3)
+ RSEQ_ASM_OP_CMPEQ(v, expect, "%l[cmpfail]")
+ RSEQ_INJECT_ASM(4)
+#ifdef RSEQ_COMPARE_TWICE
+ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, "%l[error1]")
+ RSEQ_ASM_OP_CMPEQ(v, expect, "%l[error2]")
+#endif
+ RSEQ_ASM_OP_R_BAD_MEMCPY(dst, src, len)
+ RSEQ_INJECT_ASM(5)
+ RSEQ_ASM_OP_FINAL_STORE(newv, v, 3)
+ 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_abi.cpu_id),
+ [rseq_cs] "m" (__rseq_abi.rseq_cs),
+ [expect] "r" (expect),
+ [v] "m" (*v),
+ [newv] "r" (newv),
+ [dst] "r" (dst),
+ [src] "r" (src),
+ [len] "r" (len)
+ RSEQ_INJECT_INPUT
+ : "memory", RSEQ_ASM_TMP_REG_1, RSEQ_ASM_TMP_REG_2,
+ RSEQ_ASM_TMP_REG_3, RSEQ_ASM_TMP_REG_4
+ RSEQ_INJECT_CLOBBER
+ : abort, cmpfail
+#ifdef RSEQ_COMPARE_TWICE
+ , error1, error2
+#endif
+ );
+
+ return 0;
+abort:
+ RSEQ_INJECT_FAILED
+ return -1;
+cmpfail:
+ return 1;
+#ifdef RSEQ_COMPARE_TWICE
+error1:
+ rseq_bug("cpu_id comparison failed");
+error2:
+ rseq_bug("expected value comparison failed");
+#endif
+}
+
+static inline __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(1, 2f, 3f, 4f)
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[cmpfail]")
+#ifdef RSEQ_COMPARE_TWICE
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error2]")
+#endif
+ RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
+ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
+ RSEQ_INJECT_ASM(3)
+ RSEQ_ASM_OP_CMPEQ(v, expect, "%l[cmpfail]")
+ RSEQ_INJECT_ASM(4)
+#ifdef RSEQ_COMPARE_TWICE
+ RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, "%l[error1]")
+ RSEQ_ASM_OP_CMPEQ(v, expect, "%l[error2]")
+#endif
+ RSEQ_ASM_OP_R_BAD_MEMCPY(dst, src, len)
+ RSEQ_INJECT_ASM(5)
+ RSEQ_ASM_OP_FINAL_STORE_RELEASE(newv, v, 3)
+ 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_abi.cpu_id),
+ [rseq_cs] "m" (__rseq_abi.rseq_cs),
+ [expect] "r" (expect),
+ [v] "m" (*v),
+ [newv] "r" (newv),
+ [dst] "r" (dst),
+ [src] "r" (src),
+ [len] "r" (len)
+ RSEQ_INJECT_INPUT
+ : "memory", RSEQ_ASM_TMP_REG_1, RSEQ_ASM_TMP_REG_2,
+ RSEQ_ASM_TMP_REG_3, RSEQ_ASM_TMP_REG_4
+ RSEQ_INJECT_CLOBBER
+ : abort, cmpfail
+#ifdef RSEQ_COMPARE_TWICE
+ , error1, error2
+#endif
+ );
+
+ return 0;
+abort:
+ RSEQ_INJECT_FAILED
+ return -1;
+cmpfail:
+ return 1;
+#ifdef RSEQ_COMPARE_TWICE
+error1:
+ rseq_bug("cpu_id comparison failed");
+error2:
+ rseq_bug("expected value comparison failed");
+#endif
+}
+
+#define RSEQ_ARCH_HAS_OFFSET_DEREF_ADDV
+
+/*
+ * pval = *(ptr+off)
+ * *pval += inc;
+ */
+static inline __always_inline
+int rseq_offset_deref_addv(intptr_t *ptr, off_t off, intptr_t inc, int cpu)
+{
+ RSEQ_INJECT_C(9)
+
+ __asm__ __volatile__ goto(RSEQ_ASM_DEFINE_TABLE(1, 2f, 3f, 4f)
+#ifdef RSEQ_COMPARE_TWICE
+ RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
+#endif
+ RSEQ_ASM_STORE_RSEQ_CS(2, 1b, 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
+ RSEQ_ASM_OP_R_DEREF_ADDV(ptr, off, 3)
+ 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_abi.cpu_id),
+ [rseq_cs] "m" (__rseq_abi.rseq_cs),
+ [ptr] "r" (ptr),
+ [off] "er" (off),
+ [inc] "er" (inc)
+ RSEQ_INJECT_INPUT
+ : "memory", RSEQ_ASM_TMP_REG_1
+ RSEQ_INJECT_CLOBBER
+ : abort
+#ifdef RSEQ_COMPARE_TWICE
+ , error1
+#endif
+ );
+ return 0;
+abort:
+ RSEQ_INJECT_FAILED
+ return -1;
+#ifdef RSEQ_COMPARE_TWICE
+error1:
+ rseq_bug("cpu_id comparison failed");
+#endif
+}
+
+#endif /* !RSEQ_SKIP_FASTPATH */
diff --git a/tools/testing/selftests/rseq/rseq.h b/tools/testing/selftests/rseq/rseq.h
index 3f63eb362b92..72efb6d3d84e 100644
--- a/tools/testing/selftests/rseq/rseq.h
+++ b/tools/testing/selftests/rseq/rseq.h
@@ -79,6 +79,8 @@ extern int __rseq_handled;
#include <rseq-mips.h>
#elif defined(__s390__)
#include <rseq-s390.h>
+#elif defined(__riscv)
+#include <rseq-riscv.h>
#else
#error unsupported target
#endif
--
2.17.1
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linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v4 2/2] rseq/selftests: Add support for RISC-V
2022-03-08 8:32 ` [PATCH v4 2/2] rseq/selftests: Add support for RISC-V Vincent Chen
@ 2022-03-08 15:24 ` Mathieu Desnoyers
0 siblings, 0 replies; 5+ messages in thread
From: Mathieu Desnoyers @ 2022-03-08 15:24 UTC (permalink / raw)
To: Vincent Chen; +Cc: Palmer Dabbelt, linux-riscv, Paul Walmsley
----- On Mar 8, 2022, at 3:32 AM, Vincent Chen vincent.chen@sifive.com wrote:
> Add support for RISC-V in the rseq selftests, which covers both
> 64-bit and 32-bit ISA with little endian mode.
Considering that AFAIU there is no way to build a big endian riscv Linux kernel
today, only testing little endian riscv seems fine.
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
>
> Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
> Tested-by: Eric Lin <eric.lin@sifive.com>
> ---
> tools/testing/selftests/rseq/param_test.c | 23 +
> tools/testing/selftests/rseq/rseq-riscv.h | 677 ++++++++++++++++++++++
> tools/testing/selftests/rseq/rseq.h | 2 +
> 3 files changed, 702 insertions(+)
> create mode 100644 tools/testing/selftests/rseq/rseq-riscv.h
>
> diff --git a/tools/testing/selftests/rseq/param_test.c
> b/tools/testing/selftests/rseq/param_test.c
> index 699ad5f93c34..0a6b8eafd444 100644
> --- a/tools/testing/selftests/rseq/param_test.c
> +++ b/tools/testing/selftests/rseq/param_test.c
> @@ -207,6 +207,29 @@ unsigned int yield_mod_cnt, nr_abort;
> "addiu " INJECT_ASM_REG ", -1\n\t" \
> "bnez " INJECT_ASM_REG ", 222b\n\t" \
> "333:\n\t"
> +#elif defined(__riscv)
> +
> +#define RSEQ_INJECT_INPUT \
> + , [loop_cnt_1]"m"(loop_cnt[1]) \
> + , [loop_cnt_2]"m"(loop_cnt[2]) \
> + , [loop_cnt_3]"m"(loop_cnt[3]) \
> + , [loop_cnt_4]"m"(loop_cnt[4]) \
> + , [loop_cnt_5]"m"(loop_cnt[5]) \
> + , [loop_cnt_6]"m"(loop_cnt[6])
> +
> +#define INJECT_ASM_REG "t1"
> +
> +#define RSEQ_INJECT_CLOBBER \
> + , INJECT_ASM_REG
> +
> +#define RSEQ_INJECT_ASM(n) \
> + "lw " INJECT_ASM_REG ", %[loop_cnt_" #n "]\n\t" \
> + "beqz " INJECT_ASM_REG ", 333f\n\t" \
> + "222:\n\t" \
> + "addi " INJECT_ASM_REG "," INJECT_ASM_REG ", -1\n\t" \
> + "bnez " INJECT_ASM_REG ", 222b\n\t" \
> + "333:\n\t"
> +
>
> #else
> #error unsupported target
> diff --git a/tools/testing/selftests/rseq/rseq-riscv.h
> b/tools/testing/selftests/rseq/rseq-riscv.h
> new file mode 100644
> index 000000000000..b86642f90d7f
> --- /dev/null
> +++ b/tools/testing/selftests/rseq/rseq-riscv.h
> @@ -0,0 +1,677 @@
> +/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
> +/*
> + * Select the instruction "csrw mhartid, x0" as the RSEQ_SIG. Unlike
> + * other architectures, the ebreak instruction has no immediate field for
> + * distinguishing purposes. Hence, ebreak is not suitable as RSEQ_SIG.
> + * "csrw mhartid, x0" can also satisfy the RSEQ requirement because it
> + * is an uncommon instruction and will raise an illegal instruction
> + * exception when executed in all modes.
> + */
> +#include <endian.h>
> +
> +#if defined(__BYTE_ORDER) ? (__BYTE_ORDER == __LITTLE_ENDIAN) :
> defined(__LITTLE_ENDIAN)
> +#define RSEQ_SIG 0xf1401073 /* csrr mhartid, x0 */
> +#else
> +#error "Currently, RSEQ only supports Little-Endian version"
> +#endif
> +
> +#if __riscv_xlen == 64
> +#define __REG_SEL(a, b) a
> +#elif __riscv_xlen == 32
> +#define __REG_SEL(a, b) b
> +#endif
> +
> +#define REG_L __REG_SEL("ld ", "lw ")
> +#define REG_S __REG_SEL("sd ", "sw ")
> +
> +#define RISCV_FENCE(p, s) \
> + __asm__ __volatile__ ("fence " #p "," #s : : : "memory")
> +#define rseq_smp_mb() RISCV_FENCE(rw, rw)
> +#define rseq_smp_rmb() RISCV_FENCE(r, r)
> +#define rseq_smp_wmb() RISCV_FENCE(w, w)
> +#define RSEQ_ASM_TMP_REG_1 "t6"
> +#define RSEQ_ASM_TMP_REG_2 "t5"
> +#define RSEQ_ASM_TMP_REG_3 "t4"
> +#define RSEQ_ASM_TMP_REG_4 "t3"
> +
> +#define rseq_smp_load_acquire(p) \
> +__extension__ ({ \
> + __typeof(*(p)) ____p1 = RSEQ_READ_ONCE(*(p)); \
> + RISCV_FENCE(r, rw) \
> + ____p1; \
> +})
> +
> +#define rseq_smp_acquire__after_ctrl_dep() rseq_smp_rmb()
> +
> +#define rseq_smp_store_release(p, v) \
> +do { \
> + RISCV_FENCE(rw, w); \
> + RSEQ_WRITE_ONCE(*(p), v); \
> +} while (0)
> +
> +#ifdef RSEQ_SKIP_FASTPATH
> +#include "rseq-skip.h"
> +#else /* !RSEQ_SKIP_FASTPATH */
> +
> +#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, start_ip, \
> + post_commit_offset, abort_ip) \
> + ".pushsection __rseq_cs, \"aw\"\n" \
> + ".balign 32\n" \
> + __rseq_str(label) ":\n" \
> + ".long " __rseq_str(version) ", " __rseq_str(flags) "\n" \
> + ".quad " __rseq_str(start_ip) ", " \
> + __rseq_str(post_commit_offset) ", " \
> + __rseq_str(abort_ip) "\n" \
> + ".popsection\n\t" \
> + ".pushsection __rseq_cs_ptr_array, \"aw\"\n" \
> + ".quad " __rseq_str(label) "b\n" \
> + ".popsection\n"
> +
> +#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" \
> + ".quad " __rseq_str(start_ip) ", " __rseq_str(exit_ip) "\n" \
> + ".popsection\n"
> +
> +#define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \
> + RSEQ_INJECT_ASM(1) \
> + "la "RSEQ_ASM_TMP_REG_1 ", " __rseq_str(cs_label) "\n" \
> + REG_S RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(rseq_cs) "]\n" \
> + __rseq_str(label) ":\n"
> +
> +#define RSEQ_ASM_DEFINE_ABORT(label, abort_label) \
> + "j 222f\n" \
> + ".balign 4\n" \
> + ".long " __rseq_str(RSEQ_SIG) "\n" \
> + __rseq_str(label) ":\n" \
> + "j %l[" __rseq_str(abort_label) "]\n" \
> + "222:\n"
> +
> +#define RSEQ_ASM_OP_STORE(value, var) \
> + REG_S "%[" __rseq_str(value) "], %[" __rseq_str(var) "]\n"
> +
> +#define RSEQ_ASM_OP_CMPEQ(var, expect, label) \
> + REG_L RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(var) "]\n" \
> + "bne "RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(expect) "] ," \
> + __rseq_str(label) "\n"
> +
> +#define RSEQ_ASM_OP_CMPEQ32(var, expect, label) \
> + "lw "RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(var) "]\n" \
> + "bne "RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(expect) "] ," \
> + __rseq_str(label) "\n"
> +
> +#define RSEQ_ASM_OP_CMPNE(var, expect, label) \
> + REG_L RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(var) "]\n" \
> + "beq "RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(expect) "] ," \
> + __rseq_str(label) "\n"
> +
> +#define RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, label) \
> + RSEQ_INJECT_ASM(2) \
> + RSEQ_ASM_OP_CMPEQ32(current_cpu_id, cpu_id, label)
> +
> +#define RSEQ_ASM_OP_R_LOAD(var) \
> + REG_L RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(var) "]\n"
> +
> +#define RSEQ_ASM_OP_R_STORE(var) \
> + REG_S RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(var) "]\n"
> +
> +#define RSEQ_ASM_OP_R_LOAD_OFF(offset) \
> + "add "RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(offset) "], " \
> + RSEQ_ASM_TMP_REG_1 "\n" \
> + REG_L RSEQ_ASM_TMP_REG_1 ", (" RSEQ_ASM_TMP_REG_1 ")\n"
> +
> +#define RSEQ_ASM_OP_R_ADD(count) \
> + "add "RSEQ_ASM_TMP_REG_1 ", " RSEQ_ASM_TMP_REG_1 \
> + ", %[" __rseq_str(count) "]\n"
> +
> +#define RSEQ_ASM_OP_FINAL_STORE(value, var, post_commit_label) \
> + RSEQ_ASM_OP_STORE(value, var) \
> + __rseq_str(post_commit_label) ":\n"
> +
> +#define RSEQ_ASM_OP_FINAL_STORE_RELEASE(value, var, post_commit_label) \
> + "fence rw, w\n" \
> + RSEQ_ASM_OP_STORE(value, var) \
> + __rseq_str(post_commit_label) ":\n"
> +
> +#define RSEQ_ASM_OP_R_FINAL_STORE(var, post_commit_label) \
> + REG_S RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(var) "]\n" \
> + __rseq_str(post_commit_label) ":\n"
> +
> +#define RSEQ_ASM_OP_R_BAD_MEMCPY(dst, src, len) \
> + "beqz %[" __rseq_str(len) "], 333f\n" \
> + "mv " RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(len) "]\n" \
> + "mv " RSEQ_ASM_TMP_REG_2 ", %[" __rseq_str(src) "]\n" \
> + "mv " RSEQ_ASM_TMP_REG_3 ", %[" __rseq_str(dst) "]\n" \
> + "222:\n" \
> + "lb " RSEQ_ASM_TMP_REG_4 ", 0(" RSEQ_ASM_TMP_REG_2 ")\n" \
> + "sb " RSEQ_ASM_TMP_REG_4 ", 0(" RSEQ_ASM_TMP_REG_3 ")\n" \
> + "addi " RSEQ_ASM_TMP_REG_1 ", " RSEQ_ASM_TMP_REG_1 ", -1\n" \
> + "addi " RSEQ_ASM_TMP_REG_2 ", " RSEQ_ASM_TMP_REG_2 ", 1\n" \
> + "addi " RSEQ_ASM_TMP_REG_3 ", " RSEQ_ASM_TMP_REG_3 ", 1\n" \
> + "bnez " RSEQ_ASM_TMP_REG_1 ", 222b\n" \
> + "333:\n"
> +
> +#define RSEQ_ASM_OP_R_DEREF_ADDV(ptr, off, post_commit_label) \
> + "mv " RSEQ_ASM_TMP_REG_1 ", %[" __rseq_str(ptr) "]\n" \
> + RSEQ_ASM_OP_R_ADD(off) \
> + REG_L RSEQ_ASM_TMP_REG_1 ", 0(" RSEQ_ASM_TMP_REG_1 ")\n" \
> + RSEQ_ASM_OP_R_ADD(inc) \
> + __rseq_str(post_commit_label) ":\n"
> +
> +static inline __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(1, 2f, 3f, 4f)
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[cmpfail]")
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error2]")
> +#endif
> + RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
> + RSEQ_INJECT_ASM(3)
> + RSEQ_ASM_OP_CMPEQ(v, expect, "%l[cmpfail]")
> + RSEQ_INJECT_ASM(4)
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, "%l[error1]")
> + RSEQ_ASM_OP_CMPEQ(v, expect, "%l[error2]")
> +#endif
> + RSEQ_ASM_OP_FINAL_STORE(newv, v, 3)
> + 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_abi.cpu_id),
> + [rseq_cs] "m" (__rseq_abi.rseq_cs),
> + [v] "m" (*v),
> + [expect] "r" (expect),
> + [newv] "r" (newv)
> + RSEQ_INJECT_INPUT
> + : "memory", RSEQ_ASM_TMP_REG_1
> + RSEQ_INJECT_CLOBBER
> + : abort, cmpfail
> +#ifdef RSEQ_COMPARE_TWICE
> + , error1, error2
> +#endif
> + );
> +
> + return 0;
> +abort:
> + RSEQ_INJECT_FAILED
> + return -1;
> +cmpfail:
> + return 1;
> +#ifdef RSEQ_COMPARE_TWICE
> +error1:
> + rseq_bug("cpu_id comparison failed");
> +error2:
> + rseq_bug("expected value comparison failed");
> +#endif
> +}
> +
> +static inline __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)
> +
> + __asm__ __volatile__ goto(RSEQ_ASM_DEFINE_TABLE(1, 2f, 3f, 4f)
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[cmpfail]")
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error2]")
> +#endif
> + RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
> + RSEQ_INJECT_ASM(3)
> + RSEQ_ASM_OP_CMPNE(v, expectnot, "%l[cmpfail]")
> + RSEQ_INJECT_ASM(4)
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, "%l[error1]")
> + RSEQ_ASM_OP_CMPNE(v, expectnot, "%l[error2]")
> +#endif
> + RSEQ_ASM_OP_R_LOAD(v)
> + RSEQ_ASM_OP_R_STORE(load)
> + RSEQ_ASM_OP_R_LOAD_OFF(voffp)
> + RSEQ_ASM_OP_R_FINAL_STORE(v, 3)
> + 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_abi.cpu_id),
> + [rseq_cs] "m" (__rseq_abi.rseq_cs),
> + [v] "m" (*v),
> + [expectnot] "r" (expectnot),
> + [load] "m" (*load),
> + [voffp] "r" (voffp)
> + RSEQ_INJECT_INPUT
> + : "memory", RSEQ_ASM_TMP_REG_1
> + RSEQ_INJECT_CLOBBER
> + : abort, cmpfail
> +#ifdef RSEQ_COMPARE_TWICE
> + , error1, error2
> +#endif
> + );
> + return 0;
> +abort:
> + RSEQ_INJECT_FAILED
> + return -1;
> +cmpfail:
> + return 1;
> +#ifdef RSEQ_COMPARE_TWICE
> +error1:
> + rseq_bug("cpu_id comparison failed");
> +error2:
> + rseq_bug("expected value comparison failed");
> +#endif
> +}
> +
> +static inline __always_inline
> +int rseq_addv(intptr_t *v, intptr_t count, int cpu)
> +{
> + RSEQ_INJECT_C(9)
> +
> + __asm__ __volatile__ goto(RSEQ_ASM_DEFINE_TABLE(1, 2f, 3f, 4f)
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
> +#endif
> + RSEQ_ASM_STORE_RSEQ_CS(2, 1b, 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
> + RSEQ_ASM_OP_R_LOAD(v)
> + RSEQ_ASM_OP_R_ADD(count)
> + RSEQ_ASM_OP_R_FINAL_STORE(v, 3)
> + 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_abi.cpu_id),
> + [rseq_cs] "m" (__rseq_abi.rseq_cs),
> + [v] "m" (*v),
> + [count] "r" (count)
> + RSEQ_INJECT_INPUT
> + : "memory", RSEQ_ASM_TMP_REG_1
> + RSEQ_INJECT_CLOBBER
> + : abort
> +#ifdef RSEQ_COMPARE_TWICE
> + , error1
> +#endif
> + );
> + return 0;
> +abort:
> + RSEQ_INJECT_FAILED
> + return -1;
> +#ifdef RSEQ_COMPARE_TWICE
> +error1:
> + rseq_bug("cpu_id comparison failed");
> +#endif
> +}
> +
> +static inline __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(1, 2f, 3f, 4f)
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[cmpfail]")
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error2]")
> +#endif
> + RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
> + RSEQ_INJECT_ASM(3)
> + RSEQ_ASM_OP_CMPEQ(v, expect, "%l[cmpfail]")
> + RSEQ_INJECT_ASM(4)
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, "%l[error1]")
> + RSEQ_ASM_OP_CMPEQ(v, expect, "%l[error2]")
> +#endif
> + RSEQ_ASM_OP_STORE(newv2, v2)
> + RSEQ_INJECT_ASM(5)
> + RSEQ_ASM_OP_FINAL_STORE(newv, v, 3)
> + 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_abi.cpu_id),
> + [rseq_cs] "m" (__rseq_abi.rseq_cs),
> + [expect] "r" (expect),
> + [v] "m" (*v),
> + [newv] "r" (newv),
> + [v2] "m" (*v2),
> + [newv2] "r" (newv2)
> + RSEQ_INJECT_INPUT
> + : "memory", RSEQ_ASM_TMP_REG_1
> + RSEQ_INJECT_CLOBBER
> + : abort, cmpfail
> +#ifdef RSEQ_COMPARE_TWICE
> + , error1, error2
> +#endif
> + );
> +
> + return 0;
> +abort:
> + RSEQ_INJECT_FAILED
> + return -1;
> +cmpfail:
> + return 1;
> +#ifdef RSEQ_COMPARE_TWICE
> +error1:
> + rseq_bug("cpu_id comparison failed");
> +error2:
> + rseq_bug("expected value comparison failed");
> +#endif
> +}
> +
> +static inline __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(1, 2f, 3f, 4f)
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[cmpfail]")
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error2]")
> +#endif
> + RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
> + RSEQ_INJECT_ASM(3)
> + RSEQ_ASM_OP_CMPEQ(v, expect, "%l[cmpfail]")
> + RSEQ_INJECT_ASM(4)
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, "%l[error1]")
> + RSEQ_ASM_OP_CMPEQ(v, expect, "%l[error2]")
> +#endif
> + RSEQ_ASM_OP_STORE(newv2, v2)
> + RSEQ_INJECT_ASM(5)
> + RSEQ_ASM_OP_FINAL_STORE_RELEASE(newv, v, 3)
> + 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_abi.cpu_id),
> + [rseq_cs] "m" (__rseq_abi.rseq_cs),
> + [expect] "r" (expect),
> + [v] "m" (*v),
> + [newv] "r" (newv),
> + [v2] "m" (*v2),
> + [newv2] "r" (newv2)
> + RSEQ_INJECT_INPUT
> + : "memory", RSEQ_ASM_TMP_REG_1
> + RSEQ_INJECT_CLOBBER
> + : abort, cmpfail
> +#ifdef RSEQ_COMPARE_TWICE
> + , error1, error2
> +#endif
> + );
> +
> + return 0;
> +abort:
> + RSEQ_INJECT_FAILED
> + return -1;
> +cmpfail:
> + return 1;
> +#ifdef RSEQ_COMPARE_TWICE
> +error1:
> + rseq_bug("cpu_id comparison failed");
> +error2:
> + rseq_bug("expected value comparison failed");
> +#endif
> +}
> +
> +static inline __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(1, 2f, 3f, 4f)
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[cmpfail]")
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error2]")
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error3]")
> +#endif
> + RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
> + RSEQ_INJECT_ASM(3)
> + RSEQ_ASM_OP_CMPEQ(v, expect, "%l[cmpfail]")
> + RSEQ_INJECT_ASM(4)
> + RSEQ_ASM_OP_CMPEQ(v2, expect2, "%l[cmpfail]")
> + RSEQ_INJECT_ASM(5)
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, "%l[error1]")
> + RSEQ_ASM_OP_CMPEQ(v, expect, "%l[error2]")
> + RSEQ_ASM_OP_CMPEQ(v2, expect2, "%l[error3]")
> +#endif
> + RSEQ_ASM_OP_FINAL_STORE(newv, v, 3)
> + 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_abi.cpu_id),
> + [rseq_cs] "m" (__rseq_abi.rseq_cs),
> + [v] "m" (*v),
> + [expect] "r" (expect),
> + [v2] "m" (*v2),
> + [expect2] "r" (expect2),
> + [newv] "r" (newv)
> + RSEQ_INJECT_INPUT
> + : "memory", RSEQ_ASM_TMP_REG_1
> + RSEQ_INJECT_CLOBBER
> + : abort, cmpfail
> +#ifdef RSEQ_COMPARE_TWICE
> + , error1, error2, error3
> +#endif
> + );
> +
> + return 0;
> +abort:
> + RSEQ_INJECT_FAILED
> + return -1;
> +cmpfail:
> + return 1;
> +#ifdef RSEQ_COMPARE_TWICE
> +error1:
> + rseq_bug("cpu_id comparison failed");
> +error2:
> + rseq_bug("expected value comparison failed");
> +error3:
> + rseq_bug("2nd expected value comparison failed");
> +#endif
> +}
> +
> +static inline __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(1, 2f, 3f, 4f)
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[cmpfail]")
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error2]")
> +#endif
> + RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
> + RSEQ_INJECT_ASM(3)
> + RSEQ_ASM_OP_CMPEQ(v, expect, "%l[cmpfail]")
> + RSEQ_INJECT_ASM(4)
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, "%l[error1]")
> + RSEQ_ASM_OP_CMPEQ(v, expect, "%l[error2]")
> +#endif
> + RSEQ_ASM_OP_R_BAD_MEMCPY(dst, src, len)
> + RSEQ_INJECT_ASM(5)
> + RSEQ_ASM_OP_FINAL_STORE(newv, v, 3)
> + 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_abi.cpu_id),
> + [rseq_cs] "m" (__rseq_abi.rseq_cs),
> + [expect] "r" (expect),
> + [v] "m" (*v),
> + [newv] "r" (newv),
> + [dst] "r" (dst),
> + [src] "r" (src),
> + [len] "r" (len)
> + RSEQ_INJECT_INPUT
> + : "memory", RSEQ_ASM_TMP_REG_1, RSEQ_ASM_TMP_REG_2,
> + RSEQ_ASM_TMP_REG_3, RSEQ_ASM_TMP_REG_4
> + RSEQ_INJECT_CLOBBER
> + : abort, cmpfail
> +#ifdef RSEQ_COMPARE_TWICE
> + , error1, error2
> +#endif
> + );
> +
> + return 0;
> +abort:
> + RSEQ_INJECT_FAILED
> + return -1;
> +cmpfail:
> + return 1;
> +#ifdef RSEQ_COMPARE_TWICE
> +error1:
> + rseq_bug("cpu_id comparison failed");
> +error2:
> + rseq_bug("expected value comparison failed");
> +#endif
> +}
> +
> +static inline __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(1, 2f, 3f, 4f)
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[cmpfail]")
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error2]")
> +#endif
> + RSEQ_ASM_STORE_RSEQ_CS(2, 1b, rseq_cs)
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f)
> + RSEQ_INJECT_ASM(3)
> + RSEQ_ASM_OP_CMPEQ(v, expect, "%l[cmpfail]")
> + RSEQ_INJECT_ASM(4)
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, "%l[error1]")
> + RSEQ_ASM_OP_CMPEQ(v, expect, "%l[error2]")
> +#endif
> + RSEQ_ASM_OP_R_BAD_MEMCPY(dst, src, len)
> + RSEQ_INJECT_ASM(5)
> + RSEQ_ASM_OP_FINAL_STORE_RELEASE(newv, v, 3)
> + 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_abi.cpu_id),
> + [rseq_cs] "m" (__rseq_abi.rseq_cs),
> + [expect] "r" (expect),
> + [v] "m" (*v),
> + [newv] "r" (newv),
> + [dst] "r" (dst),
> + [src] "r" (src),
> + [len] "r" (len)
> + RSEQ_INJECT_INPUT
> + : "memory", RSEQ_ASM_TMP_REG_1, RSEQ_ASM_TMP_REG_2,
> + RSEQ_ASM_TMP_REG_3, RSEQ_ASM_TMP_REG_4
> + RSEQ_INJECT_CLOBBER
> + : abort, cmpfail
> +#ifdef RSEQ_COMPARE_TWICE
> + , error1, error2
> +#endif
> + );
> +
> + return 0;
> +abort:
> + RSEQ_INJECT_FAILED
> + return -1;
> +cmpfail:
> + return 1;
> +#ifdef RSEQ_COMPARE_TWICE
> +error1:
> + rseq_bug("cpu_id comparison failed");
> +error2:
> + rseq_bug("expected value comparison failed");
> +#endif
> +}
> +
> +#define RSEQ_ARCH_HAS_OFFSET_DEREF_ADDV
> +
> +/*
> + * pval = *(ptr+off)
> + * *pval += inc;
> + */
> +static inline __always_inline
> +int rseq_offset_deref_addv(intptr_t *ptr, off_t off, intptr_t inc, int cpu)
> +{
> + RSEQ_INJECT_C(9)
> +
> + __asm__ __volatile__ goto(RSEQ_ASM_DEFINE_TABLE(1, 2f, 3f, 4f)
> +#ifdef RSEQ_COMPARE_TWICE
> + RSEQ_ASM_DEFINE_EXIT_POINT(2f, "%l[error1]")
> +#endif
> + RSEQ_ASM_STORE_RSEQ_CS(2, 1b, 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
> + RSEQ_ASM_OP_R_DEREF_ADDV(ptr, off, 3)
> + 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_abi.cpu_id),
> + [rseq_cs] "m" (__rseq_abi.rseq_cs),
> + [ptr] "r" (ptr),
> + [off] "er" (off),
> + [inc] "er" (inc)
> + RSEQ_INJECT_INPUT
> + : "memory", RSEQ_ASM_TMP_REG_1
> + RSEQ_INJECT_CLOBBER
> + : abort
> +#ifdef RSEQ_COMPARE_TWICE
> + , error1
> +#endif
> + );
> + return 0;
> +abort:
> + RSEQ_INJECT_FAILED
> + return -1;
> +#ifdef RSEQ_COMPARE_TWICE
> +error1:
> + rseq_bug("cpu_id comparison failed");
> +#endif
> +}
> +
> +#endif /* !RSEQ_SKIP_FASTPATH */
> diff --git a/tools/testing/selftests/rseq/rseq.h
> b/tools/testing/selftests/rseq/rseq.h
> index 3f63eb362b92..72efb6d3d84e 100644
> --- a/tools/testing/selftests/rseq/rseq.h
> +++ b/tools/testing/selftests/rseq/rseq.h
> @@ -79,6 +79,8 @@ extern int __rseq_handled;
> #include <rseq-mips.h>
> #elif defined(__s390__)
> #include <rseq-s390.h>
> +#elif defined(__riscv)
> +#include <rseq-riscv.h>
> #else
> #error unsupported target
> #endif
> --
> 2.17.1
--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v4 0/2] RISC-V: add support for restartable sequence
2022-03-08 8:32 [PATCH v4 0/2] RISC-V: add support for restartable sequence Vincent Chen
2022-03-08 8:32 ` [PATCH v4 1/2] RISC-V: Add " Vincent Chen
2022-03-08 8:32 ` [PATCH v4 2/2] rseq/selftests: Add support for RISC-V Vincent Chen
@ 2022-03-23 0:54 ` Palmer Dabbelt
2 siblings, 0 replies; 5+ messages in thread
From: Palmer Dabbelt @ 2022-03-23 0:54 UTC (permalink / raw)
To: vincent.chen; +Cc: mathieu.desnoyers, linux-riscv, Paul Walmsley, vincent.chen
On Tue, 08 Mar 2022 00:32:51 PST (-0800), vincent.chen@sifive.com wrote:
>
> Add RSEQ, restartable sequence, support and related selftest to RISCV.
>
> The relevant RSEQ tests in kselftest require the binutils patch "RISC-V:
> Fix linker problems with TLS copy relocs" to avoid placing
> PREINIT_ARRAY and TLS variable of librseq.so at the same address.
> https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=3e7bd7f24146f162565edf878840449f36a8d974
> A segmental fault will happen if binutils misses this patch.
>
> Changes since v3:
> 1. Modify the endianness checking.
> 2. Fix a bug encountered in 32bit environment.
>
> Changes since v2:
> 1. Move rseq_signal_deliver() after syscall restart handling.
> 2. Add rseq_offset_deref_addv() to support memory barrier tests.
>
> Vincent Chen (2):
> RISC-V: Add support for restartable sequence
> rseq/selftests: Add support for RISC-V
>
> arch/riscv/Kconfig | 1 +
> arch/riscv/kernel/entry.S | 4 +
> arch/riscv/kernel/signal.c | 2 +
> tools/testing/selftests/rseq/param_test.c | 23 +
> tools/testing/selftests/rseq/rseq-riscv.h | 677 ++++++++++++++++++++++
> tools/testing/selftests/rseq/rseq.h | 2 +
> 6 files changed, 709 insertions(+)
> create mode 100644 tools/testing/selftests/rseq/rseq-riscv.h
Thanks, this is on for-next.
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^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2022-03-23 0:55 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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2022-03-08 8:32 [PATCH v4 0/2] RISC-V: add support for restartable sequence Vincent Chen
2022-03-08 8:32 ` [PATCH v4 1/2] RISC-V: Add " Vincent Chen
2022-03-08 8:32 ` [PATCH v4 2/2] rseq/selftests: Add support for RISC-V Vincent Chen
2022-03-08 15:24 ` Mathieu Desnoyers
2022-03-23 0:54 ` [PATCH v4 0/2] RISC-V: add support for restartable sequence Palmer Dabbelt
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