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authorMike Frysinger <vapier@gentoo.org>2009-06-24 20:02:58 -0400
committerMike Frysinger <vapier@gentoo.org>2009-09-16 21:28:45 -0400
commitc014e15a2f667f91b5c2d08a90d77197a89d8065 (patch)
tree8c02bf94abe2fcc53b8be94da527bbb2a42c671f /arch/blackfin
parent18070dd6692a35bec266ed9ea559c24da4fdeeef (diff)
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: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin')
-rw-r--r--arch/blackfin/kernel/ptrace.c129
1 files changed, 72 insertions, 57 deletions
diff --git a/arch/blackfin/kernel/ptrace.c b/arch/blackfin/kernel/ptrace.c
index 6a387eec6b6..271d7c63cef 100644
--- a/arch/blackfin/kernel/ptrace.c
+++ b/arch/blackfin/kernel/ptrace.c
@@ -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. */
@@ -215,42 +216,49 @@ 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);
-
- } 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);
-
- } else
+ 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,
- sizeof(tmp), 0);
+ to_copy, 0);
+ if (copied)
+ break;
+
+ /* 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;
+ }
- pr_debug("ptrace: copied size %d [0x%08lx]\n", copied, tmp);
- if (copied != sizeof(tmp))
break;
- ret = put_user(tmp, datap);
+ 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 == to_copy)
+ ret = put_user(tmp, datap);
break;
}
@@ -294,43 +302,50 @@ 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);
-
- } 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);
-
- } else
+ 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,
- sizeof(data), 1);
+ to_copy, 0);
+ if (copied)
+ break;
+
+ /* 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;
+ }
- pr_debug("ptrace: copied size %d\n", copied);
- if (copied != sizeof(data))
break;
- ret = 0;
+ 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 == to_copy)
+ ret = 0;
break;
}