Commit b6c7a324 authored by Paul Burton's avatar Paul Burton Committed by Ralf Baechle

MIPS: Fix get_frame_info() handling of microMIPS function size

get_frame_info() is meant to iterate over up to the first 128
instructions within a function, but for microMIPS kernels it will not
reach that many instructions unless the function is 512 bytes long since
we calculate the maximum number of instructions to check by dividing the
function length by the 4 byte size of a union mips_instruction. In
microMIPS kernels this won't do since instructions are variable length.

Fix this by instead checking whether the pointer to the current
instruction has reached the end of the function, and use max_insns as a
simple constant to check the number of iterations against.
Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
Fixes: 34c2f668 ("MIPS: microMIPS: Add unaligned access support.")
Cc: Leonid Yegoshin <leonid.yegoshin@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # v3.10+
Patchwork: https://patchwork.linux-mips.org/patch/14530/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent a3552dac
...@@ -294,9 +294,9 @@ static inline int is_sp_move_ins(union mips_instruction *ip) ...@@ -294,9 +294,9 @@ static inline int is_sp_move_ins(union mips_instruction *ip)
static int get_frame_info(struct mips_frame_info *info) static int get_frame_info(struct mips_frame_info *info)
{ {
bool is_mmips = IS_ENABLED(CONFIG_CPU_MICROMIPS); bool is_mmips = IS_ENABLED(CONFIG_CPU_MICROMIPS);
union mips_instruction insn, *ip; union mips_instruction insn, *ip, *ip_end;
unsigned max_insns = info->func_size / sizeof(union mips_instruction); const unsigned int max_insns = 128;
unsigned i; unsigned int i;
info->pc_offset = -1; info->pc_offset = -1;
info->frame_size = 0; info->frame_size = 0;
...@@ -305,11 +305,9 @@ static int get_frame_info(struct mips_frame_info *info) ...@@ -305,11 +305,9 @@ static int get_frame_info(struct mips_frame_info *info)
if (!ip) if (!ip)
goto err; goto err;
if (max_insns == 0) ip_end = (void *)ip + info->func_size;
max_insns = 128U; /* unknown function size */
max_insns = min(128U, max_insns);
for (i = 0; i < max_insns; i++, ip++) { for (i = 0; i < max_insns && ip < ip_end; i++, ip++) {
if (is_mmips && mm_insn_16bit(ip->halfword[0])) { if (is_mmips && mm_insn_16bit(ip->halfword[0])) {
insn.halfword[0] = 0; insn.halfword[0] = 0;
insn.halfword[1] = ip->halfword[0]; insn.halfword[1] = ip->halfword[0];
......
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