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common-user/host/riscv: use tail pseudoinstruction for calling tail

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The j pseudoinstruction maps to a JAL instruction, which can only handle
a jump to somewhere with a signed 20-bit destination. In case of static
linking and LTO'ing this easily leads to "relocation truncated to fit"
error.

Switch to use tail pseudoinstruction, which is the standard way to
tail-call a function in medium code model (emits AUIPC+JALR).

Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20250417072206.364008-1-uwu@icenowy.me>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Cc: qemu-stable@nongnu.org
This commit is contained in:
Icenowy Zheng 2025-04-17 15:22:06 +08:00 • committed by Alistair Francis
parent ad63158bdb
commit 22b448ccc6
1 changed files with 2 additions and 2 deletions
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4
common-user/host/riscv/safe-syscall.inc.S
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@ -69,11 +69,11 @@ safe_syscall_end:
/* code path setting errno */
0: neg a0, a0
j safe_syscall_set_errno_tail
tail safe_syscall_set_errno_tail
/* code path when we didn't execute the syscall */
2: li a0, QEMU_ERESTARTSYS
j safe_syscall_set_errno_tail
tail safe_syscall_set_errno_tail
.cfi_endproc
.size safe_syscall_base, .-safe_syscall_base