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openbsd: implement segfault handling on openbsd x86_64

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Sébastien Marie 2020-12-23 12:39:20 +00:00 committed by Veikka Tuominen
parent 588e828759
commit 6e2622661c
2 changed files with 58 additions and 1 deletions
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5
lib/std/debug.zig
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@ -1696,7 +1696,7 @@ fn getDebugInfoAllocator() *mem.Allocator {
pub const have_segfault_handling_support = switch (builtin.os.tag) {
.linux, .netbsd => true,
.windows => true,
.freebsd => @hasDecl(os, "ucontext_t"),
.freebsd, .openbsd => @hasDecl(os, "ucontext_t"),
else => false,
};
pub const enable_segfault_handler: bool = if (@hasDecl(root, "enable_segfault_handler"))
@ -1760,6 +1760,7 @@ fn handleSegfaultLinux(sig: i32, info: *const os.siginfo_t, ctx_ptr: ?*const c_v
.linux => @ptrToInt(info.fields.sigfault.addr),
.freebsd => @ptrToInt(info.addr),
.netbsd => @ptrToInt(info.info.reason.fault.addr),
.openbsd => @ptrToInt(info.data.fault.addr),
else => unreachable,
};
@ -1786,10 +1787,12 @@ fn handleSegfaultLinux(sig: i32, info: *const os.siginfo_t, ctx_ptr: ?*const c_v
const ip = switch (builtin.os.tag) {
.linux, .netbsd => @intCast(usize, ctx.mcontext.gregs[os.REG_RIP]),
.freebsd => @intCast(usize, ctx.mcontext.rip),
.openbsd => @intCast(usize, ctx.sc_rip),
else => unreachable,
};
const bp = switch (builtin.os.tag) {
.linux, .netbsd => @intCast(usize, ctx.mcontext.gregs[os.REG_RBP]),
.openbsd => @intCast(usize, ctx.sc_rbp),
.freebsd => @intCast(usize, ctx.mcontext.rbp),
else => unreachable,
};

54
lib/std/os/bits/openbsd.zig
View File

@ -809,6 +809,60 @@ comptime {
std.debug.assert(@sizeOf(siginfo_t) == 136);
}
pub usingnamespace switch (builtin.arch) {
.x86_64 => struct {
pub const ucontext_t = extern struct {
sc_rdi: c_long,
sc_rsi: c_long,
sc_rdx: c_long,
sc_rcx: c_long,
sc_r8: c_long,
sc_r9: c_long,
sc_r10: c_long,
sc_r11: c_long,
sc_r12: c_long,
sc_r13: c_long,
sc_r14: c_long,
sc_r15: c_long,
sc_rbp: c_long,
sc_rbx: c_long,
sc_rax: c_long,
sc_gs: c_long,
sc_fs: c_long,
sc_es: c_long,
sc_ds: c_long,
sc_trapno: c_long,
sc_err: c_long,
sc_rip: c_long,
sc_cs: c_long,
sc_rflags: c_long,
sc_rsp: c_long,
sc_ss: c_long,
sc_fpstate: fxsave64,
__sc_unused: c_int,
sc_mask: c_int,
sc_cookie: c_long,
};
pub const fxsave64 = packed struct {
fx_fcw: u16,
fx_fsw: u16,
fx_ftw: u8,
fx_unused1: u8,
fx_fop: u16,
fx_rip: u64,
fx_rdp: u64,
fx_mxcsr: u32,
fx_mxcsr_mask: u32,
fx_st: [8][2]u64,
fx_xmm: [16][2]u64,
fx_unused3: [96]u8,
};
},
else => struct {},
};
pub const sigset_t = c_uint;
pub const empty_sigset: sigset_t = 0;