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Get binaries closer to running without an o/s

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blinkenlights now does a pretty good job emulating what happens when
binaries boot from BIOS into long mode. So it's been much easier to
debug the bare metal process and wrinkle out many issues.
This commit is contained in:
Justine Tunney
2020-10-29 04:53:20 -07:00
parent feed0d2b0e
commit 2d80bbc802
50 changed files with 974 additions and 1062 deletions
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16
libc/nexgen32e/rdtscp.h
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@@ -1,5 +1,6 @@
#ifndef COSMOPOLITAN_LIBC_NEXGEN32E_RDTSCP_H_
#define COSMOPOLITAN_LIBC_NEXGEN32E_RDTSCP_H_
#include "libc/bits/bits.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
@@ -32,17 +33,26 @@ COSMOPOLITAN_C_START_
*/
#define rdpid() \
({ \
bool Ok; \
long Msr; \
Ok = false; \
if (X86_HAVE(RDPID)) { \
asm volatile("rdpid\t%0" : "=r"(Msr) : /* no inputs */ : "memory"); \
Ok = true; \
} else if (IsLinux()) { \
asm volatile("lsl\t%1,%0" : "=r"(Msr) : "r"(0x7b) : "memory"); \
} else if (X86_HAVE(RDTSCP)) { \
asm volatile(ZFLAG_ASM("lsl\t%2,%1") \
: ZFLAG_CONSTRAINT(Ok), "=r"(Msr) \
: "r"(0x7b) \
: "memory"); \
} \
if (!Ok && X86_HAVE(RDTSCP)) { \
asm volatile("rdtscp" \
: "=c"(Msr) \
: /* no inputs */ \
: "eax", "edx", "memory"); \
} else { \
Ok = true; \
} \
if (!Ok) { \
Msr = -1; \
} \
Msr; \