diff options
| author | Nicholas Noll <nbnoll@eml.cc> | 2021-11-20 09:53:11 -0800 |
|---|---|---|
| committer | Nicholas Noll <nbnoll@eml.cc> | 2021-11-20 09:53:11 -0800 |
| commit | 1c8d4e69205fd875f6bec3fa3bd929c2e7f52f62 (patch) | |
| tree | 8bb6233e8f59d574e99a55a8c9aaf4d90396a2ce /include | |
| parent | 59d87ccc99f431da06a0ffab0d3e702d9ef82f48 (diff) | |
Feature: self hosting prototype implemented
This is a large change. In order to remove myself from libc's arcane
interface, I implemented an independent runtime layer. It is based on
musl's wonderful implementation mostly. Critically, if libc is linked to
the program, then we cooperate. Namely, we call start main and let libc
do all initialization. If not, then we have a noop defined in rt3.a.
The general structure of the file is:
1. sys/$os/$arch contains all architecture dependent code
2. sys/$os/port contains all code that depends on the os, but is
portable
3. rt/$arch contains all the runtime architecture dependent code
4. rt/* contains the portable runtime code.
Obviously testing is needed. Specifically, while code is checked in for
the most popular architectures, it only has been tested on one computer!
Overall this is exciting and as been educational.
Diffstat (limited to 'include')
| -rw-r--r-- | include/rt.h | 15 | ||||
| -rw-r--r-- | include/u.h | 5 |
2 files changed, 20 insertions, 0 deletions
diff --git a/include/rt.h b/include/rt.h new file mode 100644 index 0000000..43357cd --- /dev/null +++ b/include/rt.h @@ -0,0 +1,15 @@ +#pragma once + +extern struct rt·Context +{ + void (*fini)(void); + void (*exit)(void); + + uintptr *auxv; + uintptr pagesize; + uintptr sysinfo; +} rt·context; + +extern char **rt·environ; + +void noreturn rt·exit(int code); diff --git a/include/u.h b/include/u.h index 333d6b2..d415d82 100644 --- a/include/u.h +++ b/include/u.h @@ -108,6 +108,11 @@ typedef __builtin_va_list va_list; // ------------------------------------------------------------------
// global macros
+/* weak aliasing */
+#define noreturn _Noreturn
+#define hidden __attribute__((__visibility__("hidden")))
+#define weakalias(old, new) extern __typeof(old) new __attribute__((weak, alias(#old)))
+
/* offsets */
#define offsetof(t, d) __builtin_offsetof(t, d)
|