Merge pull request #3808 from LemonBoy/i386-for-ya

linux-i386 support

Author: andrewrk

lib/std/debug.zig

@@ -2417,6 +2417,12 @@ extern fn handleSegfaultLinux(sig: i32, info: *const os.siginfo_t, ctx_ptr: *con
     std.debug.warn("Segmentation fault at address 0x{x}\n", addr);
 
     switch (builtin.arch) {
+        .i386 => {
+            const ctx = @ptrCast(*const os.ucontext_t, @alignCast(@alignOf(os.ucontext_t), ctx_ptr));
+            const ip = @intCast(usize, ctx.mcontext.gregs[os.REG_EIP]);
+            const bp = @intCast(usize, ctx.mcontext.gregs[os.REG_EBP]);
+            dumpStackTraceFromBase(bp, ip);
+        },
         .x86_64 => {
             const ctx = @ptrCast(*const os.ucontext_t, @alignCast(@alignOf(os.ucontext_t), ctx_ptr));
             const ip = @intCast(usize, ctx.mcontext.gregs[os.REG_RIP]);

lib/std/os/bits/linux.zig

@@ -9,6 +9,7 @@ pub usingnamespace switch (builtin.arch) {
 };
 
 pub usingnamespace switch (builtin.arch) {
+    .i386 => @import("linux/i386.zig"),
     .x86_64 => @import("linux/x86_64.zig"),
     .aarch64 => @import("linux/arm64.zig"),
     .arm => @import("linux/arm-eabi.zig"),

lib/std/os/bits/linux/arm-eabi.zig

@@ -466,7 +466,6 @@ pub const MAP_LOCKED = 0x2000;
 /// don't check for reservations
 pub const MAP_NORESERVE = 0x4000;
 
-pub const VDSO_USEFUL = true;
 pub const VDSO_CGT_SYM = "__vdso_clock_gettime";
 pub const VDSO_CGT_VER = "LINUX_2.6";
 

lib/std/os/bits/linux/arm64.zig

@@ -358,7 +358,6 @@ pub const MAP_LOCKED = 0x2000;
 /// don't check for reservations
 pub const MAP_NORESERVE = 0x4000;
 
-pub const VDSO_USEFUL = true;
 pub const VDSO_CGT_SYM = "__kernel_clock_gettime";
 pub const VDSO_CGT_VER = "LINUX_2.6.39";