xref: /openbmc/linux/tools/testing/selftests/rseq/rseq-arm-bits.h (revision 9a87ffc99ec8eb8d35eed7c4f816d75f5cc9662e)

/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
/*
 * rseq-arm-bits.h
 *
 * (C) Copyright 2016-2022 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#include "rseq-bits-template.h"

#if defined(RSEQ_TEMPLATE_MO_RELAXED) && \
	(defined(RSEQ_TEMPLATE_CPU_ID) || defined(RSEQ_TEMPLATE_MM_CID))

static inline __attribute__((always_inline))
int RSEQ_TEMPLATE_IDENTIFIER(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(9, 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, 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_get_abi()->RSEQ_TEMPLATE_CPU_ID_FIELD),
		  [rseq_cs]		"m" (rseq_get_abi()->rseq_cs.arch.ptr),
		  [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_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_TEMPLATE_IDENTIFIER(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(9, 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, 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_get_abi()->RSEQ_TEMPLATE_CPU_ID_FIELD),
		  [rseq_cs]		"m" (rseq_get_abi()->rseq_cs.arch.ptr),
		  /* 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_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_TEMPLATE_IDENTIFIER(rseq_addv)(intptr_t *v, intptr_t count, int cpu)
{
	RSEQ_INJECT_C(9)

	__asm__ __volatile__ goto (
		RSEQ_ASM_DEFINE_TABLE(9, 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, 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_get_abi()->RSEQ_TEMPLATE_CPU_ID_FIELD),
		  [rseq_cs]		"m" (rseq_get_abi()->rseq_cs.arch.ptr),
		  [v]			"m" (*v),
		  [count]		"Ir" (count)
		  RSEQ_INJECT_INPUT
		: "r0", "memory", "cc"
		  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_TEMPLATE_IDENTIFIER(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(9, 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, 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_get_abi()->RSEQ_TEMPLATE_CPU_ID_FIELD),
		  [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
		: "r0", "memory", "cc"
		  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
}

#endif /* #if defined(RSEQ_TEMPLATE_MO_RELAXED) &&
	(defined(RSEQ_TEMPLATE_CPU_ID) || defined(RSEQ_TEMPLATE_MM_CID)) */

#if (defined(RSEQ_TEMPLATE_MO_RELAXED) || defined(RSEQ_TEMPLATE_MO_RELEASE)) && \
	(defined(RSEQ_TEMPLATE_CPU_ID) || defined(RSEQ_TEMPLATE_MM_CID))

static inline __attribute__((always_inline))
int RSEQ_TEMPLATE_IDENTIFIER(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(9, 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, 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)
#ifdef RSEQ_TEMPLATE_MO_RELEASE
		"dmb\n\t"	/* full mb provides store-release */
#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_get_abi()->RSEQ_TEMPLATE_CPU_ID_FIELD),
		  [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
		: "r0", "memory", "cc"
		  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_TEMPLATE_IDENTIFIER(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)

	__asm__ __volatile__ goto (
		RSEQ_ASM_DEFINE_TABLE(9, 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
		"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)
#ifdef RSEQ_TEMPLATE_MO_RELEASE
		"dmb\n\t"	/* full mb provides store-release */
#endif
		/* 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_get_abi()->RSEQ_TEMPLATE_CPU_ID_FIELD),
		  [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_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_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 /* #if (defined(RSEQ_TEMPLATE_MO_RELAXED) || defined(RSEQ_TEMPLATE_MO_RELEASE)) &&
	(defined(RSEQ_TEMPLATE_CPU_ID) || defined(RSEQ_TEMPLATE_MM_CID)) */

#include "rseq-bits-reset.h"