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Merge pull request #495 from cseagle/seg_regs

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pack SegmentDescriptor to eliminate any alignment ambiguity
This commit is contained in:
Nguyen Anh Quynh 2016-03-29 09:57:03 +07:00
parent 56d70845da 3ca072e0de
commit b0ed72e846
1 changed files with 36 additions and 34 deletions
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38
samples/sample_x86_32_gdt_and_seg_regs.c
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@ -26,6 +26,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#include <stdlib.h> #include <stdlib.h>
#include <unistd.h> #include <unistd.h>
#pragma pack(push, 1)
struct SegmentDescriptor { struct SegmentDescriptor {
union { union {
struct { struct {
@ -33,27 +34,27 @@ struct SegmentDescriptor {
unsigned short limit0; unsigned short limit0;
unsigned short base0; unsigned short base0;
unsigned char base1; unsigned char base1;
unsigned int type:4; unsigned char type:4;
unsigned int system:1; /* S flag */ unsigned char system:1; /* S flag */
unsigned int dpl:2; unsigned char dpl:2;
unsigned int present:1; /* P flag */ unsigned char present:1; /* P flag */
unsigned int limit1:4; unsigned char limit1:4;
unsigned int avail:1; unsigned char avail:1;
unsigned int is_64_code:1; /* L flag */ unsigned char is_64_code:1; /* L flag */
unsigned int db:1; /* DB flag */ unsigned char db:1; /* DB flag */
unsigned int granularity:1; /* G flag */ unsigned char granularity:1; /* G flag */
unsigned char base2; unsigned char base2;
#else #else
unsigned char base2; unsigned char base2;
unsigned int granularity:1; /* G flag */ unsigned char granularity:1; /* G flag */
unsigned int db:1; /* DB flag */ unsigned char db:1; /* DB flag */
unsigned int is_64_code:1; /* L flag */ unsigned char is_64_code:1; /* L flag */
unsigned int avail:1; unsigned char avail:1;
unsigned int limit1:4; unsigned char limit1:4;
unsigned int present:1; /* P flag */ unsigned char present:1; /* P flag */
unsigned int dpl:2; unsigned char dpl:2;
unsigned int system:1; /* S flag */ unsigned char system:1; /* S flag */
unsigned int type:4; unsigned char type:4;
unsigned char base1; unsigned char base1;
unsigned short base0; unsigned short base0;
unsigned short limit0; unsigned short limit0;
@ -62,6 +63,7 @@ struct SegmentDescriptor {
uint64_t desc; uint64_t desc;
}; };
}; };
#pragma pack(pop)
#define SEGBASE(d) ((uint32_t)((((d).desc >> 16) & 0xffffff) | (((d).desc >> 32) & 0xff000000))) #define SEGBASE(d) ((uint32_t)((((d).desc >> 16) & 0xffffff) | (((d).desc >> 32) & 0xff000000)))
#define SEGLIMIT(d) ((d).limit0 | (((unsigned int)(d).limit1) << 16)) #define SEGLIMIT(d) ((d).limit0 | (((unsigned int)(d).limit1) << 16))