4c87212d63
r7 is reserved in thumb2 (typically for the frame pointer, as opposed to r11 in ARM mode), so assigning to a variable with explicit register storage in r7 will produce an error. But r7 is where the Linux kernel expects the syscall number to be placed. We can use a temporary to get the register allocator to pick a temporary, which we save+restore the previous value of r7 in. Fixes: #93738
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