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start: Disable the gp initialization code for the self-hosted riscv64 backend.

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Alex Rønne Petersen 2024-07-30 17:42:11 +02:00
parent 982510f8d5
commit 653eb75355
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1 changed files with 14 additions and 8 deletions
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22
lib/std/start.zig
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@ -272,21 +272,27 @@ fn _start() callconv(.Naked) noreturn {
\\ bstrins.d $sp, $zero, 3, 0
\\ b %[posixCallMainAndExit]
,
// zig fmt: off
.riscv32, .riscv64 =>
// The RISC-V ELF ABI assumes that `gp` is set to the value of `__global_pointer$` at
// startup in order for GP relaxation to work, even in static builds.
\\ .weak __global_pointer$
\\ .hidden __global_pointer$
\\ .option push
\\ .option norelax
\\ lla gp, __global_pointer$
\\ .option pop
// The self-hosted riscv64 backend is not able to assemble this yet.
if (builtin.zig_backend != .stage2_riscv64)
// The RISC-V ELF ABI assumes that `gp` is set to the value of `__global_pointer$` at
// startup in order for GP relaxation to work, even in static builds.
\\ .weak __global_pointer$
\\ .hidden __global_pointer$
\\ .option push
\\ .option norelax
\\ lla gp, __global_pointer$
\\ .option pop
else ""
++
\\ li s0, 0
\\ li ra, 0
\\ mv a0, sp
\\ andi sp, sp, -16
\\ tail %[posixCallMainAndExit]@plt
,
// zig fmt: off
.m68k =>
// Note that the - 8 is needed because pc in the jsr instruction points into the middle
// of the jsr instruction. (The lea is 6 bytes, the jsr is 4 bytes.)