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Commit c014e15a authored by Mike Frysinger's avatar Mike Frysinger
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Blackfin: convert ptrace to new memory functions 



Now that we have a Blackfin memory function to figure out how to properly
access the different regions, drop the custom memory range checks in our
ptrace code and use that.  It makes the code nicer and fixes bugs where
the ptrace logic wasn't handling all the different regions.

Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent 18070dd6

arch/blackfin/kernel/ptrace.c

+72 −57
Original line number Diff line number Diff line
@@ -206,6 +206,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) 
{

	int ret;

	unsigned long __user *datap = (unsigned long __user *)data;

	void *paddr = (void *)addr;



	switch (request) {

		/* when I and D space are separate, these will need to be fixed. */
@@ -215,41 +216,48 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) 
	case PTRACE_PEEKTEXT:	/* read word at location addr. */

		{

			unsigned long tmp = 0;

			int copied;

			int copied = 0, to_copy = sizeof(tmp);



			ret = -EIO;

			pr_debug("ptrace: PEEKTEXT at addr 0x%08lx + %ld\n", addr, sizeof(data));

			if (is_user_addr_valid(child, addr, sizeof(tmp)) < 0)

			pr_debug("ptrace: PEEKTEXT at addr 0x%08lx + %i\n", addr, to_copy);

			if (is_user_addr_valid(child, addr, to_copy) < 0)

				break;

			pr_debug("ptrace: user address is valid\n");



			if (L1_CODE_LENGTH != 0 && addr >= get_l1_code_start()

			    && addr + sizeof(tmp) <= get_l1_code_start() + L1_CODE_LENGTH) {

				safe_dma_memcpy (&tmp, (const void *)(addr), sizeof(tmp));

				copied = sizeof(tmp);



			} else if (L1_DATA_A_LENGTH != 0 && addr >= L1_DATA_A_START

			    && addr + sizeof(tmp) <= L1_DATA_A_START + L1_DATA_A_LENGTH) {

				memcpy(&tmp, (const void *)(addr), sizeof(tmp));

				copied = sizeof(tmp);



			} else if (L1_DATA_B_LENGTH != 0 && addr >= L1_DATA_B_START

			    && addr + sizeof(tmp) <= L1_DATA_B_START + L1_DATA_B_LENGTH) {

				memcpy(&tmp, (const void *)(addr), sizeof(tmp));

				copied = sizeof(tmp);

			switch (bfin_mem_access_type(addr, to_copy)) {

			case BFIN_MEM_ACCESS_CORE:

			case BFIN_MEM_ACCESS_CORE_ONLY:

				copied = access_process_vm(child, addr, &tmp,

				                           to_copy, 0);

				if (copied)

					break;



			} else if (addr >= FIXED_CODE_START

			    && addr + sizeof(tmp) <= FIXED_CODE_END) {

				copy_from_user_page(0, 0, 0, &tmp, (const void *)(addr), sizeof(tmp));

				copied = sizeof(tmp);

				/* hrm, why didn't that work ... maybe no mapping */

				if (addr >= FIXED_CODE_START &&

				    addr + to_copy <= FIXED_CODE_END) {

					copy_from_user_page(0, 0, 0, &tmp, paddr, to_copy);

					copied = to_copy;

				} else if (addr >= BOOT_ROM_START) {

					memcpy(&tmp, paddr, to_copy);

					copied = to_copy;

				}



			} else

				copied = access_process_vm(child, addr, &tmp,

							   sizeof(tmp), 0);

				break;

			case BFIN_MEM_ACCESS_DMA:

				if (safe_dma_memcpy(&tmp, paddr, to_copy))

					copied = to_copy;

				break;

			case BFIN_MEM_ACCESS_ITEST:

				if (isram_memcpy(&tmp, paddr, to_copy))

					copied = to_copy;

				break;

			default:

				copied = 0;

				break;

			}



			pr_debug("ptrace: copied size %d [0x%08lx]\n", copied, tmp);

			if (copied != sizeof(tmp))

				break;

			if (copied == to_copy)

				ret = put_user(tmp, datap);

			break;

		}
@@ -294,42 +302,49 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) 
		/* fall through */

	case PTRACE_POKETEXT:	/* write the word at location addr. */

		{

			int copied;

			int copied = 0, to_copy = sizeof(data);



			ret = -EIO;

			pr_debug("ptrace: POKETEXT at addr 0x%08lx + %ld bytes %lx\n",

			         addr, sizeof(data), data);

			if (is_user_addr_valid(child, addr, sizeof(data)) < 0)

			pr_debug("ptrace: POKETEXT at addr 0x%08lx + %i bytes %lx\n",

			         addr, to_copy, data);

			if (is_user_addr_valid(child, addr, to_copy) < 0)

				break;

			pr_debug("ptrace: user address is valid\n");



			if (L1_CODE_LENGTH != 0 && addr >= get_l1_code_start()

			    && addr + sizeof(data) <= get_l1_code_start() + L1_CODE_LENGTH) {

				safe_dma_memcpy ((void *)(addr), &data, sizeof(data));

				copied = sizeof(data);



			} else if (L1_DATA_A_LENGTH != 0 && addr >= L1_DATA_A_START

			    && addr + sizeof(data) <= L1_DATA_A_START + L1_DATA_A_LENGTH) {

				memcpy((void *)(addr), &data, sizeof(data));

				copied = sizeof(data);



			} else if (L1_DATA_B_LENGTH != 0 && addr >= L1_DATA_B_START

			    && addr + sizeof(data) <= L1_DATA_B_START + L1_DATA_B_LENGTH) {

				memcpy((void *)(addr), &data, sizeof(data));

				copied = sizeof(data);

			switch (bfin_mem_access_type(addr, to_copy)) {

			case BFIN_MEM_ACCESS_CORE:

			case BFIN_MEM_ACCESS_CORE_ONLY:

				copied = access_process_vm(child, addr, &data,

				                           to_copy, 0);

				if (copied)

					break;



			} else if (addr >= FIXED_CODE_START

			    && addr + sizeof(data) <= FIXED_CODE_END) {

				copy_to_user_page(0, 0, 0, (void *)(addr), &data, sizeof(data));

				copied = sizeof(data);

				/* hrm, why didn't that work ... maybe no mapping */

				if (addr >= FIXED_CODE_START &&

				    addr + to_copy <= FIXED_CODE_END) {

					copy_to_user_page(0, 0, 0, paddr, &data, to_copy);

					copied = to_copy;

				} else if (addr >= BOOT_ROM_START) {

					memcpy(paddr, &data, to_copy);

					copied = to_copy;

				}



			} else

				copied = access_process_vm(child, addr, &data,

							   sizeof(data), 1);

				break;

			case BFIN_MEM_ACCESS_DMA:

				if (safe_dma_memcpy(paddr, &data, to_copy))

					copied = to_copy;

				break;

			case BFIN_MEM_ACCESS_ITEST:

				if (isram_memcpy(paddr, &data, to_copy))

					copied = to_copy;

				break;

			default:

				copied = 0;

				break;

			}



			pr_debug("ptrace: copied size %d\n", copied);

			if (copied != sizeof(data))

				break;

			if (copied == to_copy)

				ret = 0;

			break;

		}