mirrors/Atmosphere
1
0
Fork 0
mirror of https://github.com/Atmosphere-NX/Atmosphere.git synced 2025-05-18 17:14:28 -04:00
Code Issues Projects Releases Packages Wiki Activity

libexo/sc7fw: support release/debug/audit

Browse source
This commit is contained in:
Michael Scire 2020-11-14 12:17:38 -08:00
parent f74527d93c
commit 71a38ae74d
14 changed files with 413 additions and 47 deletions
Download patch file Download diff file Expand all files Collapse all files

100
libraries/libexosphere/source/libc/libgcc_division.arch.arm.c
View file

@ -155,6 +155,106 @@ signed __aeabi_idivmod(signed numerator, signed denominator)
return ret_idivmod_values(qr.q, qr.r);
}
/* struct lqr - stores qutient/remainder to handle divmod EABI interfaces. */
struct lqr {
unsigned long long q; /* computed quotient */
unsigned long long r; /* computed remainder */
unsigned q_n; /* specficies if quotient shall be negative */
unsigned r_n; /* specficies if remainder shall be negative */
};
static void ul_div_qr(unsigned long long numerator,
unsigned long long denominator, struct lqr *qr);
static void division_lqr(unsigned long long n, unsigned long long p,
struct lqr *qr)
{
unsigned long long i = 1, q = 0;
if (p == 0) {
qr->r = 0xFFFFFFFFFFFFFFFFULL; /* division by 0 */
return;
}
while ((p >> 63) == 0) {
i = i << 1; /* count the max division steps */
p = p << 1; /* increase p until it has maximum size*/
}
while (i > 0) {
q = q << 1; /* write bit in q at index (size-1) */
if (n >= p) {
n -= p;
q++;
}
p = p >> 1; /* decrease p */
i = i >> 1; /* decrease remaining size in q */
}
qr->r = n;
qr->q = q;
}
static void ul_div_qr(unsigned long long numerator,
unsigned long long denominator, struct lqr *qr)
{
division_lqr(numerator, denominator, qr);
/* negate quotient and/or remainder according to requester */
if (qr->q_n)
qr->q = -qr->q;
if (qr->r_n)
qr->r = -qr->r;
}
struct asm_ulqr {
unsigned long long v0;
unsigned long long v1;
};
/* called from assembly function __aeabi_uldivmod */
void __ul_divmod(struct asm_ulqr *asm_ulqr);
void __ul_divmod(struct asm_ulqr *asm_ulqr)
{
unsigned long long numerator = asm_ulqr->v0;
unsigned long long denominator = asm_ulqr->v1;
struct lqr qr = { .q_n = 0, .r_n = 0 };
ul_div_qr(numerator, denominator, &qr);
asm_ulqr->v0 = qr.q;
asm_ulqr->v1 = qr.r;
}
struct asm_lqr {
long long v0;
long long v1;
};
/* called from assembly function __aeabi_ldivmod */
void __l_divmod(struct asm_lqr *asm_lqr);
void __l_divmod(struct asm_lqr *asm_lqr)
{
long long numerator = asm_lqr->v0;
long long denominator = asm_lqr->v1;
struct lqr qr = { .q_n = 0, .r_n = 0 };
if (((numerator < 0) && (denominator > 0)) ||
((numerator > 0) && (denominator < 0)))
qr.q_n = 1; /* quotient shall be negate */
if (numerator < 0) {
numerator = -numerator;
qr.r_n = 1; /* remainder shall be negate */
}
if (denominator < 0)
denominator = -denominator;
ul_div_qr(numerator, denominator, &qr);
asm_lqr->v0 = qr.q;
asm_lqr->v1 = qr.r;
}
#ifdef __cplusplus
} /* extern "C" */
#endif