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glibc: Align stub symbols to the target word size.

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Ideally we'd like to use whatever alignment glibc actually ends up using in the
real libc.so.6. But we don't really have a way of getting at that information at
the moment, and it's not present in the abilist files. I haven't yet seen a
symbol that wasn't word-aligned, though, so I think this should be good enough
for 99% of symbols, if not actually 100%.
This commit is contained in:
Alex Rønne Petersen 2024-10-12 22:54:05 +02:00
parent 7b376b1c54
commit 87b1f14015
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1 changed files with 15 additions and 1 deletions
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16
src/glibc.zig
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@ -935,6 +935,7 @@ pub fn buildSharedObjects(comp: *Compilation, prog_node: std.Progress.Node) !voi
var ver_buf_i: u8 = 0;
while (ver_buf_i < versions_len) : (ver_buf_i += 1) {
// Example:
// .balign 4
// .globl _Exit_2_2_5
// .type _Exit_2_2_5, %function;
// .symver _Exit_2_2_5, _Exit@@GLIBC_2.2.5
@ -957,12 +958,14 @@ pub fn buildSharedObjects(comp: *Compilation, prog_node: std.Progress.Node) !voi
.{ sym_name, ver.major, ver.minor },
);
try stubs_asm.writer().print(
\\.balign {d}
\\.globl {s}
\\.type {s}, %function;
\\.symver {s}, {s}{s}GLIBC_{d}.{d}
\\{s}: {s} 0
\\
, .{
target.ptrBitWidth() / 8,
sym_plus_ver,
sym_plus_ver,
sym_plus_ver,
@ -983,12 +986,14 @@ pub fn buildSharedObjects(comp: *Compilation, prog_node: std.Progress.Node) !voi
.{ sym_name, ver.major, ver.minor, ver.patch },
);
try stubs_asm.writer().print(
\\.balign {d}
\\.globl {s}
\\.type {s}, %function;
\\.symver {s}, {s}{s}GLIBC_{d}.{d}.{d}
\\{s}: {s} 0
\\
, .{
target.ptrBitWidth() / 8,
sym_plus_ver,
sym_plus_ver,
sym_plus_ver,
@ -1026,10 +1031,14 @@ pub fn buildSharedObjects(comp: *Compilation, prog_node: std.Progress.Node) !voi
// a strong reference.
if (std.mem.eql(u8, lib.name, "c")) {
try stubs_asm.writer().print(
\\.balign {d}
\\.globl _IO_stdin_used
\\{s} _IO_stdin_used
\\
, .{wordDirective(target)});
, .{
target.ptrBitWidth() / 8,
wordDirective(target),
});
}
const obj_inclusions_len = try inc_reader.readInt(u16, .little);
@ -1101,6 +1110,7 @@ pub fn buildSharedObjects(comp: *Compilation, prog_node: std.Progress.Node) !voi
var ver_buf_i: u8 = 0;
while (ver_buf_i < versions_len) : (ver_buf_i += 1) {
// Example:
// .balign 4
// .globl environ_2_2_5
// .type environ_2_2_5, %object;
// .size environ_2_2_5, 4;
@ -1124,6 +1134,7 @@ pub fn buildSharedObjects(comp: *Compilation, prog_node: std.Progress.Node) !voi
.{ sym_name, ver.major, ver.minor },
);
try stubs_asm.writer().print(
\\.balign {d}
\\.globl {s}
\\.type {s}, %object;
\\.size {s}, {d};
@ -1131,6 +1142,7 @@ pub fn buildSharedObjects(comp: *Compilation, prog_node: std.Progress.Node) !voi
\\{s}: .fill {d}, 1, 0
\\
, .{
target.ptrBitWidth() / 8,
sym_plus_ver,
sym_plus_ver,
sym_plus_ver,
@ -1153,6 +1165,7 @@ pub fn buildSharedObjects(comp: *Compilation, prog_node: std.Progress.Node) !voi
.{ sym_name, ver.major, ver.minor, ver.patch },
);
try stubs_asm.writer().print(
\\.balign {d}
\\.globl {s}
\\.type {s}, %object;
\\.size {s}, {d};
@ -1160,6 +1173,7 @@ pub fn buildSharedObjects(comp: *Compilation, prog_node: std.Progress.Node) !voi
\\{s}: .fill {d}, 1, 0
\\
, .{
target.ptrBitWidth() / 8,
sym_plus_ver,
sym_plus_ver,
sym_plus_ver,