summary refs log tree commit diff stats
path: root/gitlab/issues/target_riscv/host_missing/accel_missing/836.toml
diff options
context:
space:
mode:
Diffstat (limited to 'gitlab/issues/target_riscv/host_missing/accel_missing/836.toml')
-rw-r--r--gitlab/issues/target_riscv/host_missing/accel_missing/836.toml93
1 files changed, 93 insertions, 0 deletions
diff --git a/gitlab/issues/target_riscv/host_missing/accel_missing/836.toml b/gitlab/issues/target_riscv/host_missing/accel_missing/836.toml
new file mode 100644
index 00000000..d8599736
--- /dev/null
+++ b/gitlab/issues/target_riscv/host_missing/accel_missing/836.toml
@@ -0,0 +1,93 @@
+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)"""