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Don't trash the %ecx value returned by relocate(). This was causing

us to round down the size for the relocation copy to the nearest 64kB
(+0x10 bytes); this just happened to work on most machines because the
last 64kB of the image is all-zeroes anyway (it's the .bss).
tags/v0.9.3
Michael Brown 17 lat temu
rodzic
commit
2cfe0dee1f
1 zmienionych plików z 8 dodań i 6 usunięć
  1. 8
    6
      src/arch/i386/prefix/libprefix.S

+ 8
- 6
src/arch/i386/prefix/libprefix.S Wyświetl plik

@@ -277,7 +277,7 @@ gdt_end:
277 277
  * Sets limits on the data segments %ds and %es.
278 278
  *
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  * Parameters:
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- *   %cx : segment type (FLAT_DS for 4GB or REAL_DS for 64kB)
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+ *   %dx : segment type (FLAT_DS for 4GB or REAL_DS for 64kB)
281 281
  ****************************************************************************
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  */
283 283
 
@@ -309,8 +309,8 @@ set_real_mode_limits:
309 309
 	movl	%eax, %cr0
310 310
 
311 311
 	/* Set flat segment limits */
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-	movw	%cx, %ds
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-	movw	%cx, %es
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+	movw	%dx, %ds
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+	movw	%dx, %es
314 314
 
315 315
 	/* Switch back to real mode */
316 316
 	movl	%cr0, %eax
@@ -355,6 +355,7 @@ install:
355 355
 install_prealloc:
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 	/* Save registers */
357 357
 	pushl	%esi
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+	pushw	%dx
358 359
 	/* Install .text16 and .data16 */
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 	movl	$_payload_offset, %esi
360 361
 	call	install_basemem
@@ -385,7 +386,7 @@ install_prealloc:
385 386
 	 * prior to reading the E820 memory map and relocating
386 387
 	 * properly.
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 	 */
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-	movw	$FLAT_DS, %cx
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+	movw	$FLAT_DS, %dx
389 390
 	call	set_real_mode_limits
390 391
 	movl	$HIGHMEM_LOADPOINT, %edi
391 392
 	call	install_highmem
@@ -400,7 +401,7 @@ install_prealloc:
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 	addw	$4, %sp
401 402
 
402 403
 	/* Move code to new location, set up new protected-mode GDT */
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-	movw	$FLAT_DS, %cx
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+	movw	$FLAT_DS, %dx
404 405
 	call	set_real_mode_limits
405 406
 	pushl	%edi
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 	es rep addr32 movsb
@@ -408,7 +409,7 @@ install_prealloc:
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 	lcall	*init_librm_vector
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 	/* Restore real-mode segment limits */
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-	movw	$REAL_DS, %cx
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+	movw	$REAL_DS, %dx
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 	call	set_real_mode_limits
413 414
 
414 415
 	/* Restore registers and interrupt status */
@@ -417,6 +418,7 @@ install_prealloc:
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 	popw	%ds
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 	popfw
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 #endif
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+	popw	%dx
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 	popl	%esi
421 423
 	ret
422 424
 	.size install_prealloc, . - install_prealloc

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