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-id = 836
-title = "qemu-riscv32: Syscall LSEEK returns -14 (EFAULT)"
-state = "closed"
-created_at = "2022-01-23T23:50:47.356Z"
-closed_at = "2022-01-28T14:15:32.539Z"
-labels = ["linux-user", "target: riscv"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/836"
-host-os = "Arch Linux"
-host-arch = "x86_64"
-qemu-version = "6.2.0"
-guest-os = "Linux (user-mode)"
-guest-arch = "riscv32"
-description = """The lseek() system call returns -14 (EFAULT) if the file descriptor is correct,
-which it should never do (According to the lseek(2) man page).
-
-Here is some demonstrative code:
-```
-/* System Call numbers, according to https://github.com/riscv-software-src/riscv-pk/blob/master/pk/syscall.h */
-.set SYS_OPENAT,  0x38
-.set SYS_CLOSE,   0x39
-.set SYS_LSEEK,   0x3e
-.set SYS_READ,    0x3f
-.set SYS_WRITE,   0x40
-.set SYS_EXIT,    0x5d
-
-.set SEEK_CUR,    1
-
-/* According to https://elixir.bootlin.com/linux/v5.16.2/C/ident/AT_FDCWD */
-.set AT_FDCWD,    (-100)
-
-.section .text
-.global _start
-_start:
-
-/* Open the file with SYS_OPENAT, because SYS_OPEN does not exist on riscv32 for some reason.
-   Effectively:
-   s0 = open(argv[1], 0, 0644); */
-li a7, SYS_OPENAT
-li a0, AT_FDCWD
-lw a1, 8(sp)
-li a2, 0
-li a3, 0644
-ecall
-
-/* Error checking. This succeeds. */
-blt a0, zero, unrelated_error
-
-mv s0, a0
-
-/* The broken lseek() call.
-   Same also happens no matter the position in the file.
-   Effectively:
-   lseek(s0, 0, SEEK_CUR); */
-li a7, SYS_LSEEK
-mv a0, s0
-li a1, 0
-li a2, SEEK_CUR
-ecall
-
-/* XXX: lseek() returns -14 */
-blt a0, zero, lseek_error
-
-/* Close the file. */
-li a7, SYS_CLOSE
-mv a0, s0
-ecall
-
-/* Error checking. This also succeeds. */
-blt a0, zero, unrelated_error
-
-/* exit(0); */
-li a7, SYS_EXIT
-li a0, 0
-ecall
-
-/* exit(-return_value); */
-lseek_error:
-li a7, SYS_EXIT
-sub a0, zero, a0
-ecall
-
-unrelated_error:
-li a7, SYS_EXIT
-li a0, 128
-ecall
-```"""
-reproduce = """1. riscv32-unknown-linux-gnu-as test.s -o test.o
-2. riscv32-unknown-linux-gnu-ld test.o
-3. qemu-riscv32 ./a.out test
-4. echo $? # This returns 14"""
-additional = """Complete test setup:
-
-[test.tgz](/uploads/af68c9a5236628a9c6f31f2ce94e2f04/test.tgz)"""