// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/div_overflow.c */

#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <limits.h>
#include "bpf_misc.h"

/* Just make sure that JITs used udiv/umod as otherwise we get
 * an exception from INT_MIN/-1 overflow similarly as with div
 * by zero.
 */

SEC("tc")
__description("DIV32 overflow, check 1")
__success __retval(0)
__naked void div32_overflow_check_1(void)
{
        asm volatile ("                                 \
        w1 = -1;                                        \
        w0 = %[int_min];                                \
        w0 /= w1;                                       \
        exit;                                           \
"       :
        : __imm_const(int_min, INT_MIN)
        : __clobber_all);
}

SEC("tc")
__description("DIV32 overflow, check 2")
__success __retval(0)
__naked void div32_overflow_check_2(void)
{
        asm volatile ("                                 \
        w0 = %[int_min];                                \
        w0 /= -1;                                       \
        exit;                                           \
"       :
        : __imm_const(int_min, INT_MIN)
        : __clobber_all);
}

SEC("tc")
__description("DIV64 overflow, check 1")
__success __retval(0)
__naked void div64_overflow_check_1(void)
{
        asm volatile ("                                 \
        r1 = -1;                                        \
        r2 = %[llong_min] ll;                           \
        r2 /= r1;                                       \
        w0 = 0;                                         \
        if r0 == r2 goto l0_%=;                         \
        w0 = 1;                                         \
l0_%=:  exit;                                           \
"       :
        : __imm_const(llong_min, LLONG_MIN)
        : __clobber_all);
}

SEC("tc")
__description("DIV64 overflow, check 2")
__success __retval(0)
__naked void div64_overflow_check_2(void)
{
        asm volatile ("                                 \
        r1 = %[llong_min] ll;                           \
        r1 /= -1;                                       \
        w0 = 0;                                         \
        if r0 == r1 goto l0_%=;                         \
        w0 = 1;                                         \
l0_%=:  exit;                                           \
"       :
        : __imm_const(llong_min, LLONG_MIN)
        : __clobber_all);
}

SEC("tc")
__description("MOD32 overflow, check 1")
__success __retval(_INT_MIN)
__naked void mod32_overflow_check_1(void)
{
        asm volatile ("                                 \
        w1 = -1;                                        \
        w0 = %[int_min];                                \
        w0 %%= w1;                                      \
        exit;                                           \
"       :
        : __imm_const(int_min, INT_MIN)
        : __clobber_all);
}

SEC("tc")
__description("MOD32 overflow, check 2")
__success __retval(_INT_MIN)
__naked void mod32_overflow_check_2(void)
{
        asm volatile ("                                 \
        w0 = %[int_min];                                \
        w0 %%= -1;                                      \
        exit;                                           \
"       :
        : __imm_const(int_min, INT_MIN)
        : __clobber_all);
}

SEC("tc")
__description("MOD64 overflow, check 1")
__success __retval(1)
__naked void mod64_overflow_check_1(void)
{
        asm volatile ("                                 \
        r1 = -1;                                        \
        r2 = %[llong_min] ll;                           \
        r3 = r2;                                        \
        r2 %%= r1;                                      \
        w0 = 0;                                         \
        if r3 != r2 goto l0_%=;                         \
        w0 = 1;                                         \
l0_%=:  exit;                                           \
"       :
        : __imm_const(llong_min, LLONG_MIN)
        : __clobber_all);
}

SEC("tc")
__description("MOD64 overflow, check 2")
__success __retval(1)
__naked void mod64_overflow_check_2(void)
{
        asm volatile ("                                 \
        r2 = %[llong_min] ll;                           \
        r3 = r2;                                        \
        r2 %%= -1;                                      \
        w0 = 0;                                         \
        if r3 != r2 goto l0_%=;                         \
        w0 = 1;                                         \
l0_%=:  exit;                                           \
"       :
        : __imm_const(llong_min, LLONG_MIN)
        : __clobber_all);
}

char _license[] SEC("license") = "GPL";