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Move internal static garbage into vmst.

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Potentially, this could have ended up being non-zero when used by concurrent threads.
This commit is contained in:
Toby Jaffey 2025-12-14 19:34:58 +00:00
parent 1e7343d385
commit 9bda566997
2 changed files with 9 additions and 11 deletions
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19
uvm32/uvm32.c
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@ -39,9 +39,6 @@ SOFTWARE.
#include CUSTOM_STDLIB_H
#endif
// On an invalid operation, an error is set in uvm32_state_t, but a valid pointer still needs to be temporarily used
static uint32_t garbage;
#ifdef UVM32_STACK_PROTECTION
#define STACK_CANARY_VALUE 0x42 // magic value for stack canary
#endif
@ -364,8 +361,8 @@ static uint32_t *arg_to_ptr(uvm32_state_t *vmst, uvm32_evt_t *evt, uvm32_arg_t a
// if something invalid is passed to arg, we should never crash
// return a pointer to something readable
setStatusErr(vmst, UVM32_ERR_ARGS);
garbage = 0;
return &garbage;
vmst->garbage = 0;
return &vmst->garbage;
break;
}
}
@ -384,8 +381,8 @@ const char *uvm32_arg_getcstr(uvm32_state_t *vmst, uvm32_evt_t *evt, uvm32_arg_t
return (const char *)scb.ptr; // we know the buffer in cpu memory is null terminated, so safe to pass back
} else {
setStatusErr(vmst, UVM32_ERR_MEM_RD);
garbage = 0;
return (const char *)&garbage;
vmst->garbage = 0;
return (const char *)&vmst->garbage;
}
}
@ -393,8 +390,8 @@ uvm32_slice_t uvm32_arg_getslice(uvm32_state_t *vmst, uvm32_evt_t *evt, uvm32_ar
uvm32_slice_t scb;
if (!get_safeptr(vmst, uvm32_arg_getval(vmst, evt, argPtr), uvm32_arg_getval(vmst, evt, argLen), &scb)) {
setStatusErr(vmst, UVM32_ERR_MEM_RD);
garbage = 0;
scb.ptr = (uint8_t *)&garbage;
vmst->garbage = 0;
scb.ptr = (uint8_t *)&vmst->garbage;
scb.len = 0;
}
return scb;
@ -404,8 +401,8 @@ uvm32_slice_t uvm32_arg_getslice_fixed(uvm32_state_t *vmst, uvm32_evt_t *evt, uv
uvm32_slice_t scb;
if (!get_safeptr(vmst, uvm32_arg_getval(vmst, evt, argPtr), len, &scb)) {
setStatusErr(vmst, UVM32_ERR_MEM_RD);
garbage = 0;
scb.ptr = (uint8_t *)&garbage;
vmst->garbage = 0;
scb.ptr = (uint8_t *)&vmst->garbage;
scb.len = 0;
}
return scb;

1
uvm32/uvm32.h
View file

@ -146,6 +146,7 @@ typedef struct {
uint8_t *_extram; /*! External RAM pointer, or NULL */
uint32_t _extramLen; /*! Length of external RAM */
bool _extramDirty; /*! Flag to indicate VM code has modified extram since last run */
uint32_t garbage; /*! Used for returning valid pointer when operations fail */
} uvm32_state_t;
/*! Initialise a VM instance */