mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-05-28 00:02:28 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Enable CPU exception handling w/ IDT & TSS (#640)

Browse source
This commit is contained in:
tkchia 2022-09-30 05:43:08 +08:00 • committed by GitHub
parent 09811e739f
commit bc8532688b
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
7 changed files with 231 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

23
ape/macros.internal.h
View file

@ -180,6 +180,12 @@
.stub \name\()_bcs\n,long
.endm
// Task State Segment Descriptor Entries.
.macro .tssdescstub name:req
.stub \name\()_desc_ent0,quad
.stub \name\()_desc_ent1,quad
.endm
/* clang-format on */
#elif defined(__LINKER__)
@ -257,5 +263,22 @@
(X) % 10 * 0x1000000 \
: 0xffffffffffffffff)
/**
* Laying out the GDT entries for a TSS for bare metal operation.
*/
#define TSSDESCSTUB2(SYM, BASE, LIM) \
HIDDEN(SYM##_desc_ent0 = TSSDESC_ENT0(BASE, LIM)); \
HIDDEN(SYM##_desc_ent1 = TSSDESC_ENT1(BASE)); \
ASSERT((LIM) >= 0 && (LIM) <= 0xffff, "bare metal TSS is suspiciously fat")
#define TSSDESC_ENT0(BASE, LIM) \
(((LIM) << 0 & 0x000000000000ffff) | \
((BASE) << 16 & 0x000000ffffff0000) | \
0x89 << 40 | \
((LIM) >> 16 << 48 & 0x000f000000000000) | \
0x2 << 52 | \
((BASE) >> 24 << 56 & 0xff00000000000000))
#define TSSDESC_ENT1(BASE) \
((BASE) >> 32 << 0 & 0x00000000ffffffff)
#endif /* __ASSEMBLER__ */
#endif /* APE_MACROS_H_ */