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/*
* libpulp - User-space Livepatching Library
*
* Copyright (C) 2020-2021 SUSE Software Solutions GmbH
*
* This file is part of libpulp.
*
* libpulp is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* libpulp is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with libpulp. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdio.h>
/* Use some live-patchable library to apply live patches. */
#include <libblocked.h>
/* Iterate for a while to let the trigger tool apply a live patch. */
#define LOOPS 1000000000
int
main(void)
{
volatile long int counter = LOOPS;
volatile long int result1;
volatile long int result2;
volatile long int result3;
/* Signal readiness. */
printf("Waiting for input.\n");
/*
* Play with double words in the red zone:
* - Initialize double words in the red zone to zero;
* - Iterate LOOPS times, incrementing them;
* - Output them to result<N>.
*/
/* clang-format off */
asm volatile (
#if defined(__x86_64__)
"movq $0, -0x08(%%rsp)\n"
"movq $0, -0x78(%%rsp)\n"
"movq $0, -0x80(%%rsp)\n"
"loop:\n"
"addq $1, -0x08(%%rsp)\n"
"addq $1, -0x78(%%rsp)\n"
"addq $1, -0x80(%%rsp)\n"
"subq $1, %3\n"
"cmp $0, %3\n"
"jne loop\n"
"movq -0x08(%%rsp), %0\n"
"movq -0x78(%%rsp), %1\n"
"movq -0x80(%%rsp), %2\n"
#elif defined(__powerpc64__)
"li %%r10, 0\n"
"stw %%r10, -0x08(%%r1)\n"
"stw %%r10, -0x78(%%r1)\n"
"stw %%r10, -0x80(%%r1)\n"
"loop:\n"
"li %%r10, 1\n"
"lwa %%r11, -0x08(%%r1)\n"
"add %%r11, %%r11, %%r10\n"
"stw %%r11, -0x08(%%r1)\n"
"lwa %%r11, -0x78(%%r1)\n"
"add %%r11, %%r11, %%r10\n"
"stw %%r11, -0x78(%%r1)\n"
"lwa %%r11, -0x80(%%r1)\n"
"add %%r11, %%r11, %%r10\n"
"stw %%r11, -0x80(%%r1)\n"
"addi %3, %3, -1\n"
"cmpdi %%cr0, %3, 0\n"
"bne %%cr0, loop\n"
"lwz %0, -0x08(%%r1)\n"
"lwz %1, -0x78(%%r1)\n"
"lwz %2, -0x80(%%r1)\n"
#endif
: "=r"(result1), "=r"(result2), "=r"(result3), "+r"(counter)
);
/* clang-format on */
if (result1 == LOOPS && result2 == LOOPS && result3 == LOOPS)
return 0;
hello();
printf("Got %ld, %ld, and %ld, when all values expected to be %ld\n",
result1, result2, result3, (long int)LOOPS);
return 1;
}
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