arch/hexagon/mm/copy_to_user.S

Source file repositories/reference/linux-study-clean/arch/hexagon/mm/copy_to_user.S

File Facts

System
Linux kernel
Corpus path
arch/hexagon/mm/copy_to_user.S
Extension
.S
Size
1551 bytes
Lines
80
Domain
Architecture Layer
Bucket
arch/hexagon
Inferred role
Architecture Layer: arch/hexagon
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#define src_sav r13
#define dst_sav r12
#define src_dst_sav r13:12
#define d_dbuf r15:14
#define w_dbuf r15

#define dst r0
#define src r1
#define bytes r2
#define loopcount r5

#define FUNCNAME raw_copy_to_user
#include "copy_user_template.S"

	/* STORE FAULTS from COPY_TO_USER */
	.falign
1109:
2109:
4109:
	/* Alignment loop.  r2 has been updated.  Return it. */
	{
		r0 = r2
		jumpr r31
	}
	/* Normal copy loops.  Use dst-dst_sav to compute distance */
	/* dst holds best write, no need to unwind any loops */
	/* X - (A - B) == X + B - A */
	.falign
8189:
8199:
4189:
4199:
2189:
2199:
1189:
1199:
	{
		r2 += sub(dst_sav,dst)
	}
	{
		r0 = r2
		jumpr r31
	}

	/* COPY TO USER: only stores can fail */
	.section __ex_table,"a"
	.long 1100b,1109b
	.long 2100b,2109b
	.long 4100b,4109b
	.long 8180b,8189b
	.long 8190b,8199b
	.long 4180b,4189b
	.long 4190b,4199b
	.long 2180b,2189b
	.long 2190b,2199b
	.long 1180b,1189b
	.long 1190b,1199b
	.previous

Annotation

Implementation Notes